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PEOPLE@HES-SO - Verzeichnis der Mitarbeitenden und Kompetenzen
PEOPLE@HES-SO - Verzeichnis der Mitarbeitenden und Kompetenzen

PEOPLE@HES-SO
Verzeichnis der Mitarbeitenden und Kompetenzen

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Ertz Olivier

Ertz Olivier

Professeur HES associé

Hauptkompetenzen

Collaborative mapping & cartography

Geospatial data visualization

Augmented Reality

  • Kontakt

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Hauptvertrag

Professeur HES associé

Telefon-Nummer: +41 24 557 75 70

Büro: S205a

Haute école d'Ingénierie et de Gestion du Canton de Vaud
Route de Cheseaux 1, 1400 Yverdon-les-Bains, CH
HEIG-VD
Institut
MEI - Institut d'ingénierie des Médias
Es müssen keine Daten für diesen Abschnitt angezeigt werden.

Laufend

BiodivAR - OH
AGP

Rolle: Hauptgesuchsteller/in

Financement: FNS

Description du projet : Overhead HES-SO pour "Building Location-based Augmented Reality Applications through Advanced Pedagogical Methods to Support Learning about Biodiversity"

Forschungsteam innerhalb von HES-SO: Dozot Grégory , Oulevay Simon , Ertz Olivier , Mercier Julien , Lecorney Stéphane

Partenaires académiques: MEI

Durée du projet: 01.01.2020 - 31.10.2026

Montant global du projet: 43'732 CHF

Statut: Laufend

Abgeschlossen

Swisstopo_ar
AGP

Rolle: Mitgesuchsteller/in

Requérant(e)s: INSIT, Ingensand Jens, INSIT

Financement: Swisstopo

Description du projet : Analyse de standards pour la réalité augmentée

Forschungsteam innerhalb von HES-SO: Ertz Olivier , Fürhoff Loïc , Blanc Nicolas , Ingensand Jens

Partenaires académiques: MEI; INSIT; Ingensand Jens, INSIT

Durée du projet: 21.04.2019 - 30.11.2019

Montant global du projet: 22'500 CHF

Statut: Abgeschlossen

BioPocket
AGP

Rolle: Mitgesuchsteller/in

Requérant(e)s: INSIT, Ingensand Jens, INSIT

Financement: HES-SO Rectorat

Description du projet : La biodiversité urbaine a une influence importante sur la santé psychologique et physique des citoyens; ainsi elle a une valeur économique directe et indirecte. Un certain nombre d'acteurs stratégiques sont aujourd'hui sensibilisés aux enjeux du maintien de la biodiversité en milieu urbain. Plusieurs villes suisses ont développé des programmes d'actions politiques pour soutenir cette biodiversité urbaine. La Confédération a aussi défini des indicateurs de biodiversité et entretient un réseau de mesures de la biodiversité. Cependant, cet enjeu ne déborde que très peu des sphères des décideurs publics et la grande majorité de la population n'a qu'un rapport diffus avec cette notion. Il en résulte qu'une multitude de petits actes déterminants pour la progression de la biodiversité ne sont pas réalisés et que, face à cette forme d'indifférence ou d'ignorance du grand public, la biodiversité n'est pas vraiment un enjeu politique. Les ressources allouées aux programmes politiques en cours aux échelles locales sont donc assez faibles. Autrement dit, l'un des enjeux du succès de ces politiques passe par la création d'une relation plus étroite entre les citoyens et la biodiversité urbaine et ce projet souhaite y contribuer par le développement d'une application accessible au plus grand nombre. Sur le plan technique, ce projet développe un outil interactif (application mobile) de communication sur la biodiversité urbaine. Les utilisateurs auront ainsi un accès facile à de l'information, présentée en réalité augmentée, concernant la biodiversité de leur environnement direct. L'application lie ainsi l'information spatiale (localisation de l'utilisateur et contexte urbain) à l'information sur la biodiversité. D'un point de vue théorique, ce projet s'appuie sur la théorie de la communication engageante qui se situe au croisement de la psychologie sociale et de la communication. Elle consiste à intégrer, dans les outils de communication, la possibilité pour le public de réaliser de petits actes « engageants » qui facilitent ensuite la réalisation d'actions plus déterminantes. Dans ce contexte, les micro-actes consistent ainsi pour les citoyens à alimenter l'outil par des relevés, photos ou commentaires. Scientifiquement, le projet sera validé par une enquête auprès des utilisateurs qui permettra de vérifier l'hypothèse à la base du projet: les utilisateurs de l'application 1) sont plus sensibilisés aux enjeux de la protection de la biodiversité et 2) réalisent d'avantage d'actions concrètes en faveur de la biodiversité.

Forschungsteam innerhalb von HES-SO: Divorne Sandrine , Oulevay Simon , Comte Daniel , Pénault Ravaillé Millo , Oberson Mathias , Jotterand Didier , Ertz Olivier , Blanc Nicolas , Ingensand Jens , Frossard Pierre-André , Produit Timothée , Lotfian Maryam , Campisi David , Composto Sarah Hélène

Partenaires académiques: MEI; INSIT; hepia inTNE; Ingensand Jens, INSIT

Durée du projet: 01.01.2016 - 30.04.2019

Montant global du projet: 170'000 CHF

Statut: Abgeschlossen

CrowDPLOS : Disabled pedestrian level of service extracted from crowdsourced images
AGP

Rolle: Mitgesuchsteller/in

Requérant(e)s: VS - Institut Informatique, Cotting Alexandre, VS - Institut Informatique

Financement: Fondation Hasler

Description du projet : CrowDPLOS : Disabled pedestrian level of service extracted from crowdsourced images

Forschungsteam innerhalb von HES-SO: Divorne Sandrine , Rojas Diego , Loubier Jean-Christophe , Liu Zhan , Ertz Olivier , Sandoz Romain , Blanc Nicolas , Sokhn Maria , Ingensand Jens , Shabani Shaban , Cotting Alexandre

Partenaires académiques: CE-RaD; VS - Institut Informatique; VS - Institut Tourisme; FIN-RaD; Cotting Alexandre, VS - Institut Informatique

Durée du projet: 01.04.2017 - 31.12.2018

Montant global du projet: 49'300 CHF

Statut: Abgeschlossen

Archeoweb
AGP

Rolle: Hauptgesuchsteller/in

Financement: Section de l¿archéologie cantonale

Description du projet : Archéologie cantonale, analyse de l'existant, propositions pour le développement du SI, en partenariat avec la DSI

Forschungsteam innerhalb von HES-SO: Oulevay Simon , Rappo Daniel , Ertz Olivier

Partenaires académiques: MEI; Ertz Olivier, MEI

Durée du projet: 01.12.2014 - 30.06.2018

Montant global du projet: 50'296 CHF

Statut: Abgeschlossen

MGDM Portrayal & Swiss Geological Survey: SLD/SE use cases
AGP

Rolle: Hauptgesuchsteller/in

Financement: Swisstopo - armasuisse Finances; Interkantonale Koordination in der Geoinformation ; KOGIS

Description du projet : MGDM considère les 163 géodonnées de base de niveau d'accès A et de droit fédéral. Il s'agit d'étudier la faisabilité quant à l'utilisation des standards SLD 1.1 et SE 1.1 pour modéliser leurs représentations cartographiques selon les exigences recueillies et formulées (cf. annexes). The context of SWISSGEOL concerns the Swiss Geological Survey of Swisstopo aiming at delivering portrayal information to their enquirers of geological data-sets. Besides, KOGIS started a wider project defining general guidelines for creating portrayal models in relation to geo-basic data as defined by the GeoIG, GeoIV. Currently, KOGIS seriously consider OGC standards related to cartographic portrayal modeling and rendering as the preferred method for modeling symbology. Therefore, there is an opportunity to demonstrate strengths and limitations of the Styled Layer Descriptor (SLD) and especially Symbology Encoding (SE) specifications against geological symbols.

Forschungsteam innerhalb von HES-SO: Rappo Daniel , Ertz Olivier

Partenaires académiques: MEI

Durée du projet: 01.01.2013 - 31.12.2016

Montant global du projet: 42'593 CHF

Statut: Abgeschlossen

Plateforme générique de "service multimédia basé sur la localisation"
AGP

Rolle: Mitgesuchsteller/in

Financement: HES-SO Rectorat; FR - EIA - ITIC - Smart Networks & Services; IICT; MEI; IICT

Description du projet : L'objectif de ce projet est de concevoir et d'implémenter une plateforme générique de « service multimédia basé sur la localisation » permettant de délivrer à des utilisateurs, du contenu multimédia customisé selon leur positionnement géographique. Le projet MobiWalk profitera d'une riche expérience acquise à travers notre collaboration récente avec l'ECAL (Ecole de l'Art de Lausanne) dans le domaine de la gestion des données multimédias cinématographiques. Le projet MobiWalk mettra à disposition des fonctionnalités avancées d'accès et d'exploitation des sources hétérogènes de données multimédia, d'enrichissement avec des métadonnées géographiques, et de présentation sur un support mobile. Cette plateforme nous permettra de valoriser nos compétences dans d'autres domaines d'activité, tel que celui du tourisme et du loisir. Nous envisageons aussi d'autres débouchés pour des démonstrations « images » pour le grand public pour les travaux menés à bien au sein de la HES-SO. En effet chaque école pourrait « customiser » le système MobiWalk pour une visite de leur établissement à leurs étudiants potentiels.

Forschungsteam innerhalb von HES-SO: Divorne Sandrine , Raileanu Laura Elena , Ertz Olivier , Fatemi Nastaran , Wagen Jean-Frédéric

Durée du projet: 01.03.2009 - 01.03.2010

Montant global du projet: 200'000 CHF

Statut: Abgeschlossen

Placement automatique d'étiquettes
AGP

Rolle: Mitgesuchsteller/in

Financement: HES-SO Rectorat; SIM-TIC; MEI; INSIT; SIM-TIC

Description du projet : Le positionnement de légendes (ou d'attributs d'objets sous forme de labels) est un problème qui apparaît dans de nombreuses applications, évidemment en cartographie où l'on doit positionner par exemple le nom des localités, mais également pour tout ce qui touche les systèmes d'information géographiques, la statistique spatiale, les systèmes de navigation ou les interfaces graphiques notamment en ce qui concerne l'affichage sur des pages web. Avec l'accroissement du volume des données disponibles et la rapidité de leur mise à jour, il est nécessaire de concevoir des systèmes permettant de choisir automatiquement les objets dont on pourra effectivement placer une légende et, le cas échéant, de déterminer sa position de sorte qu'elle ne se superpose pas avec une autre. On peut citer diverses applications nécessitant une mise à jour fréquente de la position de légendes, par exemple lorsqu'un utilisateur désire pouvoir choisir interactivement les types d'objets à afficher, ou pour le suivi de la position d'un groupe d'éléments (véhicules de secours, taxis, bateaux transmettant leur position à l'aide d'un système embarqué). L'affichage d'un maximum de données ainsi que le choix des positions des légendes est un problème difficile faisant actuellement l'objet de nombreuses recherches algorithmiques. Le placement automatique de légendes est un problème qui est résolu par des techniques avancées d'optimisation dans lesquelles nous sommes spécialisés. Nous avons avec succès abordé le problème du placement de légendes pour des objets ponctuels. En particulier, nous avons eu une collaboration fructueuse avec le département des systèmes d'information de l'Université Fédérale de l'État de Rio de Janeiro avec lequel nous avons mis au point un algorithme très rapide produisant d'excellentes solutions.

Forschungsteam innerhalb von HES-SO: Taillard Eric , Rappo Daniel , Ertz Olivier , Laurent Maxence

Durée du projet: 08.01.2007 - 30.06.2008

Montant global du projet: 126'625 CHF

Statut: Abgeschlossen

GO WEBSERVICES - TOWARDS GEOSERVICES PORTALS
AGP

Rolle: Hauptgesuchsteller/in

Financement: HES-SO Rectorat; Microgis; Camptocamp SA

Description du projet : "Les informations géographiques sont des données à référence spatiale, reproduisant les traits caractéristiques d'un pays, que ce soit sous forme de coordonnées, de noms de lieux, d'adresses postales ou de tout autre critère. Dans notre société moderne de la communication, elles constituent la base de processus, de planifications, de mesures et de décisions de toutes natures. Et cela dans l'administration comme dans le domaine économique, scientifique ou encore dans la sphère privée." [Source: L'information géographique, la ressource du 21ème siècle. De données précieuses vers la mise en réseau de services, http://www.e-geo.ch 2002]. Demain, les entrepreneurs pourront connaître instantanément la configuration de leur marché, la localisation de leurs clients, l'emprise des concurrents, et répondre aisément à des questions complexes de rationalisation, compte tenu de cette composante géographique de l'information, dont l'importance est capitale. Mais pour l'heure, données et traitements sont largement sous-exploités, eu égard aux contraintes d'accès, de coûts, de mise en 'uvre, qui en font une discipline réservée à un public restreint de spécialistes. C'est donc via la distribution d'applicatifs spécialisés que l'on favorisera l'exploitation des données et la disponibilité des traitements. Dans ce contexte, c'est un modèle pay per use or view qui se profile, à l'issue duquel devrait forcément intervenir une baisse des coûts d'accès aux instruments d'analyse et aux informations sur lesquelles ils s'appuyent. Ce nouveau modèle est encouragé par le secteur public au travers de projets d'envergure (INSPIRE, COSIG). Les Consortiums de normalisation suivent la même tendance, que ce soit avec le nouveau paradigme des services web ou par les standards de l'OGC. En effet, l'utilisation des services web est en pleine expansion passant du phénomène de mode à l'outil de dialogue incontournable. Après le web du contenu, nous entrons dans l'ère du web des services, pivot fonctionnel de la future génération des applications distribuées. Si les services web spécialisés dans l'aide à la mobilité se généralisent, il existe des thématiques encore peu développées. Le présent projet vise à promouvoir des services web géographiques orientés Business Mapping. Il constitue une expérimentation, dans le cadre de l'initiative OWS, large banc d'essai pour lequel un appel à contribution est lancé dans le but de valider les spécifications du consortium. Face à l'incompatibilité des mécanismes propriétaires, ces spécifications tendent à définir des standards pour faciliter l'interopérabilité. Il sera donc opportun d'accompagner les travaux de l'OGC sur les spécifications de "geoprocessing web service" et sur la migration de celles-ci vers les standards informatiques (SOAP), dans un domaine que nous maîtrisons bien et pour lequel nous avons accumulé une vaste expérience. D'une manière générale, le projet doit entreprendre le développement de nouveaux services web géographiques utiles à susciter la confiance dans les technologies et standards définis pour en faciliter l'exploitation. Ce projet vise la définition et le développement de services spécifiques à la cartographie thématique par une approche d'architecture orientée services web. Les spécialistes du Business Mapping utilisent abondamment la cartographie thématique pour mettre en valeur des données à caractère économique. Il s'agira donc de définir et d'orchestrer un processus d'étude type en géomarketing, basé exclusivement sur les services web déployés. Ce dernier objectif vise à la réalisation grandeur nature d'une application concrète. Ainsi, le projet tissera les premiers fils d'un portail de géoservices web utile aux entreprises en tant que vitrine de données et de savoir-faire. Celles-ci, en intégrant ces services rationnaliseront leurs processus de distribution (informations et traitements) et faciliteront grandement le travail de leurs équipes de developpement.

Forschungsteam innerhalb von HES-SO: Rappo Daniel , Ertz Olivier

Partenaires académiques: VD - Ra&D; Camptocamp SA; Microgis SA

Durée du projet: 01.01.2005 - 31.12.2006

Montant global du projet: 231'250 CHF

Statut: Abgeschlossen

2025

“Look at the trees” :
Wissenschaftlicher Artikel ArODES
a verbal nudge to reduce screen time when learning biodiversity with augmented reality

Julien Mercier, Olivier Ertz, Erwan Bocher

Computers in Human Behavior Reports,  2025, 18, 100614

Link zur Publikation

Zusammenfassung:

Although location-based augmented reality helps students explore and learn, they spend the vast majority of the activity interacting with the screen, to the detriment of direct interaction with nature. This interferes with the pedagogical objective of immersion in nature, which would foster the formation of environmental affects, an essential mediator for transforming knowledge into pro-environmental behaviors. As people interact with screens more and more, concerns have risen and so have interventions to mitigate excessive screen use. Using a nudge can positively influence the way the tablet is interacted with. The goal of this experimental study is to observe how framing the activity can impact screen interaction behavior. We gave participants different verbal instructions before a learning activity on biodiversity with location-based augmented reality. Their gaze was recorded using mobile eye tracking glasses to measure screen time. We found that a nudge reduced screen time, suggesting that the strategy is effective in influencing short-term behavior. The control group, however, reported better usability. We found no evidence of an impact on the other indicators. These results have theoretical implications for optimizing the role of technology in mobile learning, as well as practical ones on how to design nudge-based scenarios.

‘‘Look at the trees’’: A verbal nudge to reduce screen time when learning biodiversity with augmented reality
Wissenschaftlicher Artikel

Mercier Julien, Ertz Olivier, Erwan Bocher

Computers in Human Behavior Reports, 2025 , vol.  Volume 18, May 2025, no  100614

Link zur Publikation

Zusammenfassung:

Although location-based augmented reality helps students explore and learn, they spend the vast majority of the activity interacting with the screen, to the detriment of direct interaction with nature. This interferes with the pedagogical objective of immersion in nature, which would foster the formation of environmental affects, an essential mediator for transforming knowledge into pro-environmental behaviors. As people interact with screens more and more, concerns have risen and so have interventions to mitigate excessive screen use. Using a nudge can positively influence the way the tablet is interacted with. The goal of this experimental study is to observe how framing the activity can impact screen interaction behavior. We gave participants different verbal instructions before a learning activity on biodiversity with location-based augmented reality. Their gaze was recorded using mobile eye tracking glasses to measure screen time. We found that a nudge reduced screen time, suggesting that the strategy is effective in influencing short-term behavior. The control group, however, reported better usability. We found no evidence of an impact on the other indicators. These results have theoretical implications for optimizing the role of technology in mobile learning, as well as practical ones on how to design nudge-based scenarios.

2024

Mythes écologiques du numérique
Wissenschaftlicher Artikel ArODES

Ambroise Baillifard, Olivier Ertz, Stéphane Lecorney, Corinna Martarelli

Formation et profession - revue scientifique internationale en éducation,  2024, 32, 1, 1-5

Link zur Publikation

Quantifying dwell time with location-based augmented reality :
Wissenschaftlicher Artikel ArODES
dynamic AOI analysis on mobile eye tracking data with vision transformer

Julien Mercier, Olivier Ertz, Erwan Bocher

Journal of Eye Movement Research,  2024, 17, 3, 3

Link zur Publikation

Zusammenfassung:

Mobile eye tracking captures egocentric vision and is well-suited for naturalistic studies. However, its data is noisy, especially when acquired outdoor with multiple participants over several sessions. Area of interest analysis on moving targets is difficult because A) camera and objects move nonlinearly and may disappear/reappear from the scene; and B) off-the-shelf analysis tools are limited to linearly moving objects. As a result, researchers resort to time-consuming manual annotation, which limits the use of mobile eye tracking in naturalistic studies. We introduce a method based on a fine-tuned Vision Transformer (ViT) model for classifying frames with overlaying gaze markers. After fine-tuning a model on a manually labelled training set made of 1.98% (=7845 frames) of our entire data for three epochs, our model reached 99.34% accuracy as evaluated on hold-out data. We used the method to quantify participants’ dwell time on a tablet during the outdoor user test of a mobile augmented reality application for biodiversity education. We discuss the benefits and limitations of our approach and its potential to be applied to other contexts.

In Situ Visualization of 6DoF Georeferenced Historical Photographs in Location-Based Augmented Reality
Buchkapitel

Mercier Julien, Ertz Olivier, Erwan Bocher

Dans Lotfian Maryam, Starace Luigi Libero Lucio,  Web and Wireless Geographical Information Systems. 2024,  CH-6330 Cham, Switzerland : Springer Nature Switzerland AG

Link zur Publikation

Zusammenfassung:

Location-based augmented reality (AR) enables in situ visualization of geolocated media in the real world, usually based on latitude and longitude referencing only. By integrating 6DoF georeferenced photographs, they can be positioned along all three rotational axes (pitch, yaw, roll) in addition to the usual perpendicular translation axes (surge, heave, sway), resulting in data registered on all six mechanical degrees of freedom of movement of a rigid body in three-dimensional space. In this AQ1 paper, we present an integration test of 6DoF georeferenced data from the Smapshot open API to the BiodivAR open authoring tool for locationbased AR. While both projects are open source, their data is not interoperable, similarly to most citizen science (CS) projects. After mapping the data and importing it in a new augmented environment, it can be visualized in the mobile AR interface, at the locations specified by the georeferenced images. Visualizing historical photographs in the AR interface from the actual location where they were originally taken allows them to align with their original context, resulting in an eye-catching and impactful visualization. This contextual visualization of historical photographs informs and enriches their meaning, and allows viewers to quickly detect patterns and anomalies at a glance. We perform a basic qualitative evaluation of the visualization made possible by the combination of 6DoF georeferenced data and our authoring system, based on our own observations. We discuss the potential of this proof-of-concept to foster participation and understanding in citizen science and education, especially with regards to biodiversity monitoring and education.

2023

BiodivAR: :
Wissenschaftlicher Artikel ArODES
a cartographic authoring tool for the visualization of geolocated media in augmented reality

Julien Mercier, Nicolas Chabloz, Gregory Dozot, Olivier Ertz, Erwan Bocher, Daniel Rappo

ISPRS International Journal of Geo-Information,  2023, vol. 12, no. 2, article no. 61

Link zur Publikation

Zusammenfassung:

Location-based augmented reality technology for real-world, outdoor experiences is rapidly gaining in popularity in a variety of fields such as engineering, education, and gaming. By anchoring medias to geographic coordinates, it is possible to design immersive experiences remotely, without necessitating an in-depth knowledge of the context. However, the creation of such experiences typically requires complex programming tools that are beyond the reach of mainstream users. We introduce BiodivAR, a web cartographic tool for the authoring of location-based AR experiences. Developed using a user-centered design methodology and open-source interoperable web technologies, it is the second iteration of an effort that started in 2016. It is designed to meet needs defined through use cases co-designed with end users and enables the creation of custom geolocated points of interest. This approach enabled substantial progress over the previous iteration. Its reliance on geolocation data to anchor augmented objects relative to the user’s position poses a set of challenges: On mobile devices, GNSS accuracy typically lies between 1 m and 30 m. Due to its impact on the anchoring, this lack of accuracy can have deleterious effects on usability. We conducted a comparative user test using the application in combination with two different geolocation data types (GNSS versus RTK). While the test’s results are undergoing analysis, we hereby present a methodology for the assessment of our system’s usability based on the use of eye-tracking devices, geolocated traces and events, and usability questionnaires.

Impact of Geolocation Data on Augmented Reality Usability: A Comparative User Test
Wissenschaftlicher Artikel

Mercier Julien, Chabloz Nicolas, Dozot Grégory, Catherine Audrin, Ertz Olivier, Erwan Bocher, Rappo Daniel

The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, 2023 , vol.  Volume XLVIII-4/W7-2023, pp.  133-140

Link zur Publikation

Zusammenfassung:

While the use of location-based augmented reality (AR) for education has demonstrated benefits on participants’ motivation, engagement, and on their physical activity, geolocation data inaccuracy causes augmented objects to jitter or drift, which is a factor in downgrading user experience. We developed a free and open source web AR application and conducted a comparative user test (n = 54) in order to assess the impact of geolocation data on usability, exploration, and focus. A control group explored biodiversity in nature using the system in combination with embedded GNSS data, and an experimental group used an external module for RTK data. During the test, eye tracking data, geolocated traces, and in-app user-triggered events were recorded. Participants answered usability questionnaires (SUS, UEQ, HARUS). We found that the geolocation data the RTK group was exposed to was less accurate in average than that of the control group. The RTK group reported lower usability scores on all scales, of which 5 out of 9 were significant, indicating that inaccurate data negatively predicts usability. The GNSS group walked more than the RTK group, indicating a partial effect on exploration. We found no significant effect on interaction time with the screen, indicating no specific relation between data accuracy and focus. While RTK data did not allow us to better the usability of location-based AR interfaces, results allow us to assess our system’s overall usability as excellent, and to define optimal operating conditions for future use with pupils. 

2021

CITIZEN PARTICIPATION & DIGITAL TOOLS TO IMPROVE PEDESTRIAN MOBILITY IN CITIES
Wissenschaftlicher Artikel

Sandoz Romain, Ertz Olivier, Scius-Bertrand Anna, Fischer Andreas, Hüsser Olivier, Ghorbel Hatem

The International Archives of Photogrammetry, Remote Sensing and Spatial Information Sciences, 2021 , vol.  XLVI-4/W1-2021, pp.  29-34

Link zur Publikation

Zusammenfassung:

In this work, we present a framework supported by mobile and web apps and able to propose personalized pedestrian routes that match
user mobility profile considering mobility impediments factors. We explain how these later have been defined using a pedestrian-
centric approach based on travel experiences as perceived in the field by senior citizens. Through workshops, six main factors that may
influence pedestrian route choices were revealed: passability, obstacle in path, surface problem, security, sidewalk width, slope. These
categories were used to build digital tools and guide a citizen participatory approach to collect geolocated points of obstacle documented
with walkability information (picture, category, impact score, free comment). We also involved citizens to evaluate these information
and especially senior referents for validation. Finally we present how we connect these points of obstacle with a pedestrian network
based on OpenStreetMap to configure a routing cost function. The framework has been partially deployed in 2020 with limited people
due to the pandemic. Nonetheless, we share lessons learned from interaction with citizens in the design of such a framework whose
underlying workflow is reproducible. We plan to further assess its relevance and sustainability in the future.

2020

OGC symbology conceptual model :
Buch ArODES
core part

Olivier Ertz, Erwan Bocher, Matt Sorensen, Dimitri Sarafinof

2020,  [s.l.] : Open Geospatial Consortium (OGC),  39 p.

Link zur Publikation

Zusammenfassung:

This document presents the requirements for defining the Symbology Conceptual Core Model (SymCore), the conceptual basis to define symbology rules for the portrayal of geographical data. It is modular and extensible (one core model, many extensions), also encoding agnostic (one symbology model, many encodings). It contains a minimal set of abstract classes representing explicit extension points of the model. Note, that this document does not define any extensions. The SWG work that led to this proposal has been done in the continuation of the Symbology Encoding standard (SE 1.1). While portrayal concerns the complete picture of what can be called a “cartographic ecosystem,” the description of symbology rules rather concerns the subpart of it about the instructions to be applied by a rendering engine to symbolize geodata. That’s why this proposal has a focus on symbology versus concerns close to WMS Style Layer Descriptor profile (SLD) considerations. In other words, while a set of “layer styles” describe the links between some geodata and some styles to build a map, each of these styles are built of a set of symbology rules in accordance with SymCore. The overall motivation that lead to this proposal is related to the issue “how to make richer the symbology abilities.” The first answer is modularity which comes with extensibility. SE 1.1 is not modular per se, while this proposal is designed to be so with a core model extensible to host the diversity of such abilities in relation to various data models. It means that the core model is somewhat abstract and does not define concrete visualizations (e.g., red dashed line of wide thickness to draw features of type cable car). The second answer that follows from the first is about extensions. As soon as the conceptual basis is set out in a specification document (this document), then extensions have to document the concrete symbology concepts to portray geodata structured according to a given data model. It is worth to notice that conceptually, the core model is not related to any specific underlying data model to be represented. It is up to an extension to define styling abilities in relation to a specific data model (e.g., FeatureTypeStyle). The third answer is about encodings. As soon as the conceptual basis is established and extensions packaged, then the task is to define encodings to formalize the concrete conceptual symbology abilities. In summary, SymCore concerns the first answer with a consistent approach to: • provide the flexibility required to achieve adequate symbology rules for a variety of information communities; e.g., aviation symbols, weather symbols, thematic maps, etc,; and • achieve high-level styling interoperability without encoding dependencies. As a consequence, this document follows the same motivation that split up SLD 1.0 (SLD 1.1 and SE 1.1). This document puts together parts that are not specific to any service (e.g., Web Map Service), are independent, and allow the concepts to be reused by other standards willing to address aspects related to cartography. So a more general and portable symbology model is defined for use across the broad OGC standards baseline, to be applied to geospatial datasets as well as online geospatial data and mapping services. Potential implementations of SymCore are expected to enhance OGC standards such as the Web Map Service, Web Feature Service, GeoPackage, and others. By sharing a common core, and using an extension mechanism, integration of these standards for the purposes of cartographic representation could be greatly simplified.

Full publication list on ORCID
Wissenschaftlicher Artikel

Ertz Olivier

ORCID Profile, 2020

Link zur Publikation

Zusammenfassung:

Olivier Ertz

ORCID iD

https://orcid.org/0000-0002-9062-8453

2019

Auto-filtering validation in citizen science biodiversity monitoring: a case study
Wissenschaftlicher Artikel

Lotfian Maryam, Ingensand Jens, Ertz Olivier, Thibaud Chassin, Simon Oulevay

Proceedings of 29th International Cartographic Conference, 2019

Link zur Publikation

Zusammenfassung:

Keywords: Citizen Science, data validation, machine learning, biodiversity, automatic filters

Data quality is the primary concern for researchers working on citizen science projects. The collected data by citizen science participants are heterogeneous and therefore must be validated. There are several validation approaches depending on the theme and objective of the citizen science project, but the most common approach is the expert review. While expert validation is essential in citizen science projects, considering it as the only validation approach can be very difficult and complicated for the experts. In addition, volunteers can get demotivated to contribute if they do not receive any feedback regarding their submissions. This project aims at introducing an automatic filtering mechanism for a biodiversity citizen science project. The goals of this project are to first use an available historical database of the local species to filter out the unusual ones, and second to use machine learning and image recognition techniques to verify if the observation image corresponds with the right species type. The submissions that does not successfully pass the automatic filtering will be flagged as unusual and goes through expert review. The objective is on the one hand to simplify validation task by the experts, and on the other hand to increase participants’ motivation by giving them real-time feedback on their submissions. Finally, the flagged observations will be classified as valid, valid but uncommon, and invalid, and the observation outliers (rare species) can be identified for each specific region.

CrowDPLoS
Wissenschaftlicher Artikel
Building a Crowdsourcing based Disabled Pedestrian Level of Service routing application using Computer Vision and Machine Learning

Sandoz Romain, Ertz Olivier, Ingensand Jens, Blanc Nicolas, Liu Zhan, Rojas Diego, Sokhn Maria, Loubier Jean-Christophe

Consumer Communications and Networking Conference, CCNC IEEE, 2019

Link zur Publikation

Zusammenfassung:

The availability of global and scalable tools to assess disabled pedestrian level of service (DPLoS) is a real need, yet still a challenge in today's world. This is due to the lack of tools that can ease the measurement of a level of service adapted to disabled people, and also to the limitation concerns about the availability of information regarding the existing level of service, especially in real time. This paper describes preliminary results to progress on those needs. It also includes a design for a navigation tool that can help a disabled person move around a city by suggesting the most adapted routes according to the person's disabilities. The main topics are how to use advanced computer vision technologies, and how to benefit from the prevalence of handheld devices. Our approach intends to show how crowdsourcing techniques can improve data quality by gathering and combining up-to-date data with valuable field observations.

 

2018

A redesign of OGC symbology encoding standard for sharing cartography
Wissenschaftlicher Artikel ArODES

Erwan Bocher, Olivier Ertz

PeerJ Computer Science,  2018, vol. 4, article no. e143

Link zur Publikation

Zusammenfassung:

Despite most Spatial Data Infrastructures offering service-based visualization of geospatial data, requirements are often at a very basic level leading to poor quality of maps. This is a general observation for any geospatial architecture as soon as open standards as those of the Open Geospatial Consortium (OGC) are applied. To improve the situation, this paper does focus on improvements at the portrayal interoperability side by considering standardization aspects. We propose two major redesign recommendations. First to consolidate the cartographic theory at the core of the OGC Symbology Encoding standard. Secondly to build the standard in a modular way so as to be ready to be extended with upcoming future cartographic requirements. Thus, we start by defining portrayal interoperability by means of typical-use cases that frame the concept of sharing cartography. Then we bring to light the strengths and limits of the relevant open standards to consider in this context. Finally we propose a set of recommendations to overcome the limits so as to make these use cases a true reality. Even if the definition of a cartographic-oriented standard is not able to act as a complete cartographic design framework by itself, we argue that pushing forward the standardization work dedicated to cartography is a way to share and disseminate good practices and finally to improve the quality of the visualizations.

GeoSQL Journey
Wissenschaftlicher Artikel
A gamified learning experience to introduce (or demystify) geospatial SQL queries

Sandoz Romain, Ertz Olivier, Ingensand Jens, Composto Sarah Hélène, Divorne Sandrine

OGRS2018, 2018

Link zur Publikation

Zusammenfassung:

In a digital world in the making, digital natives develop new learning profiles, interests, and way of working. Simultaneously teachers are facing students with lack of engagement and motivation with quite traditional learning process that has probably to be reframed considering the effects of digital transformation in the education sector. This issue is acute when it comes to complex subject of study, such as SQL geospatial to manipulate the geospatial characteristic of data. Indeed, some common difficulties have been identified by teachers from HEIG-VD university both in Media Engineering and Geomatics fields of study. The user-centered approach aims at creating digital products highly responding to the user’s needs through techniques improving the user experience. Various aspects have to be considered, including emotions. In education, gamification, along with user experience, interface design and usability best practices is one promising approach able to increase the learner's engagement, interest and motivation. It aims to implement game mechanics within non-game context, in order to motivate the learner to accomplish a task and increase the ability to learn new skills. Using a gamification layer within a given context, being digital or not, act as a motivational trigger. It helps giving meaningful, enjoyable and empowering experience. SQL Island is a project from Kaiserslautern University of Technology which illustrates very well a gamified learning experience of the SQL special-purpose programming language. The GeoSQL Journey project goes further, tackling SQL geospatial to learn in a fun way how to manipulate the geospatial characteristic of data. It is a gamified pedagogical application to introduce the students to the practice of SQL geospatial during the first hours or days of the course. Serving as an initiation, it is designed to focus on intrinsic motivation with learning objectives determined and integrated in an engaging game world and narrative.

2014

The open source dynamics in geospatial research and education
Wissenschaftlicher Artikel ArODES

Olivier Ertz, Sergio J. Rey, Stéphane Joost

Journal of Spatial Information Science,  2014, no. 8, pp. 67-71

Link zur Publikation

2011

Towards an automated label placement service
Buchkapitel ArODES

Olivier Ertz, Maxence Laurent, Daniel Rappo, Eric Taillard

Dans Bocher, Erwan, Neteler, Markus, Geospatial Free and Open Source Software in the 21st Century : Proceedings of the first Open Source Geospatial Research Symposium, OGRS 2009  (pp. 157-171). 2011,  Berlin, Heidelberg : Springer

Link zur Publikation

Zusammenfassung:

The main focus of this chapter is to introduce a new way to ease the integration of labelling placement functionalities from a given library: a programming-language independent solution based on a web service wrapper. Considering the GeoWeb allowing to combine geodata, mapping, and geoprocessing services to fulfil various needs, it is to give an answer to a current lack: there is no such an approach for delivering advanced labelling functionalities through a standardized web service. The chapter describes a solution to wrap PAL library using standards from Open Geospatial Consortium like Web Processing Service and Symbology Encoding.

2009

PAL :
Professioneller Artikel ArODES
a cartographic labelling library

Olivier Ertz, Maxence Laurent, Daniel Rappo, Abson Sae-Tang, Eric Taillard

PositionIT,  2009, pp. 56-61

Link zur Publikation

Zusammenfassung:

PAL is a ready-to-use library for cartographic label placement under free software licence developed at the University of Applied Sciences of Western Switzerland (HES-SO). Designed for multi-layers and real-time labelling of maps, it is based on a combinational optimisation approach and provides excellent results, both in terms of execution time and solution quality.

2025

RA géolocalisée et apprentissage de la biodiversité
Konferenz
Conception d’une plateforme de création d’environnements virtuels et évaluation de leur impact sur les apprentissages théoriques, l’exploration, l’attention visuelle et les affects environnementaux

Mercier Julien, Ertz Olivier, Erwan Bocher

Sageo 2025, 19.05.2025 - 23.05.2025, Avignon, France

Link zur Konferenz

Zusammenfassung:

This research investigates the impact of location-based augmented reality (AR) on biodiversity learning. Usable solely outdoors, location-based AR enables the exploration of nature, which can be leveraged to learn about biodiversity in situ. In this work, we first attempted to address the known problems of location-based AR, linked to geolocation data’s inaccuracy. We present a cartographic platform for the creation and visualization of augmented environments, designed as an educational device to raise awareness of biodiversity. We conducted studies to analyze the usability of the AR interface, screen interaction time, and the impact of AR on biodiversity learning, including exploration and environmental affects. Our results have shown beneficial impacts on theoretical learning and exploration, as well as limitations on fostering reconnection with nature. 

2024

Enhancing Biodiversity Learning Through Analogical Reasoning and Augmented Reality: An Ecological and Experimental Study
Konferenz

Laura Leon Perez, Mercier Julien, Emmanuel Sander, Catherine Audrin, Ertz Olivier

Psychonomic Society 65th Annual Meeting, 21.11.2024 - 24.11.2024, New York City, USA

Link zur Konferenz

Zusammenfassung:

The complexity of biodiversity conceptions, encompassing both scientific and political dimensions, holds significant challenges. Effective cognitive approaches for enhancing biodiversity conceptual development are essential. This study explores the effect of an intervention using analogical reasoning combined with augmented reality (AR) technology to foster biodiversity learning among school pupils. Analogies were used for their help in grasping complex ideas by mobilizing familiar concepts and AR technology was employed because it facilitates nature exploration through its mobility and clarified abstract concepts through visualization. In a study involving 170 students aged 12 to 17, significant increase in knowledge acquisition and spatial exploration were observed in the AR condition compared to those using non-digital methods, emphasizing the potential of AR to improve learning. However, further research is needed to assess whether AR might cause distractions, potentially leading to disconnection from the natural environment. Continuing to improve this teaching approach shows great potential for enhancing students’ understanding of biodiversity concepts and increasing their environmental awareness.

In situ visualization of 6DoF georeferenced historical photographs in location-based augmented reality
Konferenz ArODES

Julien Mercier, Erwan Bocher, Olivier Ertz

Proceedings of the 21st International Symposium, W2GIS 2024, Web and Wireless Geographical Information Systems

Link zur Konferenz

Zusammenfassung:

Location-based augmented reality (AR) enables in situ visualization of geolocated media in the real world, usually based on latitude and longitude referencing only. By integrating 6DoF georeferenced photographs, they can be positioned along all three rotational axes (pitch, yaw, roll) in addition to the usual perpendicular translation axes (surge, heave, sway), resulting in data registered on all six mechanical degrees of freedom of movement of a rigid body in three-dimensional space. In this paper, we present an integration test of 6DoF georeferenced data from the Smapshot open API to the BiodivAR open authoring tool for location-based AR. While both projects are open source, their data is not interoperable, similarly to most citizen science (CS) projects. After mapping the data and importing it in a new augmented environment, it can be visualized in the mobile AR interface, at the locations specified by the georeferenced images. Visualizing historical photographs in the AR interface from the actual location where they were originally taken allows them to align with their original context, resulting in an eye-catching and impactful visualization. This contextual visualization of historical photographs informs and enriches their meaning, and allows viewers to quickly detect patterns and anomalies at a glance. We perform a basic qualitative evaluation of the visualization made possible by the combination of 6DoF georeferenced data and our authoring system, based on our own observations. We discuss the potential of this proof-of-concept to foster participation and understanding in citizen science and education, especially with regards to biodiversity monitoring and education.

Geospatial webservices and reproducibility of research :
Konferenz ArODES
challenges and needs

Maxime Collombin, Massimiliano Cannata, Olivier Ertz, Gregory Giuliani, Jens Ingensand, Claudio Primerano, Claudio Strigaro

Proceedings of the 21st International Symposium, W2GIS 2024, Web and Wireless Geographical Information Systems

Link zur Konferenz

Zusammenfassung:

This article investigates challenges and requirements related to the reproducibility of geospatial research using geospatial web-services. Several researchers have identified hinders related to technology on the one hand, as well as challenges regarding existing well-known standards that respect FAIR principles (findable, accessible, interoperable, reusable). Therefore four hypotheses are established regarding reproducibility using geospatial webservices. These four hypotheses are addressed in an online survey. The results shows correlations between academic affiliations, open standards, and reproducibility in geospatial research.

2023

Réalité augmentée géolocalisée pour l’éducation à la biodiversité
Konferenz

Mercier Julien, Ertz Olivier, Catherine Audrin, Laura Leon Perez

AUPTIC.education 2023, 15.11.2023 - 17.11.2023, Caen, France

Link zur Konferenz

Zusammenfassung:

Les technologies de réalité augmentée permettent un accès en temps et en lieu à des contenus médias superposés à l’objet observé dans la réalité. Elle offre un outil immersif qui permet un accès à du contenu pédagogique tout en réalisant une activité, sans forcément se rendre compte d’être en train d’apprendre. Ainsi, pour l’apprentissage de la biodiversité en extérieur, cet outil permet par exemple d’explorer un milieu tout en écoutant un contenu sonore (type podcast ou chant d’oiseau) relatifs à une espèce animale ou végétale qui se trouve sous nos yeux. Pour observer les apports et limites de ces technologies immersives sur les apprentissages auprès d’un public d’élèves de 12 à 15 ans, nous menons une étude combinant cadre pédagogique basé sur le raisonnement analogique et une plateforme de réalité augmentée basée spécifiquement sur la géolocalisation réalisée sur mesure. Avec cette étude, les participant·e·s explorent un milieu naturel séparé en deux zones, chacune thématisée sur deux problématiques environnementales différentes et jalonnée de points géolocalisés d’intérêt biodiversité se rapportant à ces thèmes. Une zone est explorée par les élèves au moyen d’un vecteur non-digital (points d’intérêt sur papier et carte à perforer), et la deuxième au moyen de notre outil éducatif de réalité augmentée. Grâce à des mesures sur l’exploration (postes visités, distance parcourue), sur la connexion ressentie à la nature, et sur les apprentissages, nous cherchons à observer les avantages et inconvénients relatifs à chacune de ces approches.

Next generation OGC standard for cartographic portrayal interoperability
Konferenz ArODES

Jérôme Jacovella-St-Louis, Erwan Bocher, Olivier Ertz, Maxime Collombin

Proceedings of the 31st International Cartographic Conference (ICC 2023) ; Abstracts of the ICA

Link zur Konferenz

Zusammenfassung:

The OGC Styles and Symbology Standard Working Group is developing a new candidate OGC Standard for Styles and Symbology (Bocher et al., 2023) to improve cartographic portrayal interoperability.

Impact of geolocation data on augmented reality usability :
Konferenz ArODES
a comparative user test

Julien Mercier, Nicolas Chabloz, Grégory Dozot, Catherine Audrin, Olivier Ertz, Erwan Bocher, Daniel Rappo

The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences ; Proceedings of the FOSS4G (Free and Open Source Software for Geospatial) 2023

Link zur Konferenz

Zusammenfassung:

While the use of location-based augmented reality (AR) for education has demonstrated benefits on participants’ motivation, engagement, and on their physical activity, geolocation data inaccuracy causes augmented objects to jitter or drift, which is a factor in downgrading user experience. We developed a free and open source web AR application and conducted a comparative user test (n = 54) in order to assess the impact of geolocation data on usability, exploration, and focus. A control group explored biodiversity in nature using the system in combination with embedded GNSS data, and an experimental group used an external module for RTK data. During the test, eye tracking data, geolocated traces, and in-app user-triggered events were recorded. Participants answered usability questionnaires (SUS, UEQ, HARUS).We found that the geolocation data the RTK group was exposed to was less accurate in average than that of the control group. The RTK group reported lower usability scores on all scales, of which 5 out of 9 were significant, indicating that inaccurate data negatively predicts usability. The GNSS group walked more than the RTK group, indicating a partial effect on exploration. We found no significant effect on interaction time with the screen, indicating no specific relation between data accuracy and focus. While RTK data did not allow us to better the usability of location-based AR interfaces, results allow us to assess our system’s overall usability as excellent, and to define optimal operating conditions for future use with pupils.

Augmented reality for visualizing and collecting data on biodiversity
Konferenz

Mercier Julien, Chabloz Nicolas, Dozot Grégory, Ertz Olivier, Rappo Daniel, Erwan Bocher

CitSciHelvetia’23, 29.03.2023 - 30.03.2023, Solothurn

Link zur Konferenz

2022

OGC API state of play :
Konferenz ArODES
a practical testbed for the national spatial data infrastructure in Switzerland

Nicolas Blanc, Massimiliano Cannata, Maxime Collombin, Olivier Ertz, Gregory Giuliani, Jens Ingensand

The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences ; Proceedings of the Free and Open Source Software for Geospatial (FOSS4G) 2022 – Academic Track

Link zur Konferenz

Zusammenfassung:

Interoperability standards from the Open Geospatial Consortium (OGC) shape a backbone within the OSGeo community by defining a pathway to software implementation toward the standardization of geospatial information and related services ensuring interoperability between FOSS4G software. In 2016, the OGC has initiated the creation of a new generation of standards based on the OpenAPI specifications to facilitate the integration of geospatial data in modern web applications and systems. From a practical perspective this paper intends to address the question how organizations and institutions anticipate to leverage this new generation of standards in order to deploy a geospatial data infrastructure. This issue is at the core of this article and at the center of a project that seeks to address the issue by running a Testbed Platform with a special focus to the Swiss context. To challenge these standards, the Testbed platform is configured to run a showcase with experimental cases about climate change. It is expected to bring good visibility toward all actors concerned by the Swiss standardization process and to raise interest from government stakeholders, technical or not, companies and universities as a community in synergy when considering the advances at the OGC.

2021

Citizen participation & digital tools to improve pedestrian mobility in cities
Konferenz ArODES

Olivier Ertz, Andreas Fischer, Hatem Ghorbel, Olivier Hüsser, Romain Sandoz, Anna Scius-Bertrand

The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences ; Proceedings of the 6th International Conference on Smart Data and Smart Cities

Link zur Konferenz

Zusammenfassung:

In this work, we present a framework supported by mobile and web apps and able to propose personalized pedestrian routes that match user mobility profile considering mobility impediments factors. We explain how these later have been defined using a pedestrian-centric approach based on travel experiences as perceived in the field by senior citizens. Through workshops, six main factors that may influence pedestrian route choices were revealed: passability, obstacle in path, surface problem, security, sidewalk width, slope. These categories were used to build digital tools and guide a citizen participatory approach to collect geolocated points of obstacle documented with walkability information (picture, category, impact score, free comment). We also involved citizens to evaluate these information and especially senior referents for validation. Finally we present how we connect these points of obstacle with a pedestrian network based on OpenStreetMap to configure a routing cost function. The framework has been partially deployed in 2020 with limited people due to the pandemic. Nonetheless, we share lessons learned from interaction with citizens in the design of such a framework whose underlying workflow is reproducible. We plan to further assess its relevance and sustainability in the future.

2019

Building a crowdsourcing based disabled pedestrian level of service routing application using computer vision and machine learning
Konferenz ArODES

Nicolas Blanc, Zhan Liu, Olivier Ertz, Diego Rojas, Romain Sandoz, Maria Sokhn, Jens Ingensand, Jean-Christophe Loubier

Proceedings of 2019 16th IEEE Annual consumer communications & networking conference (CCNC), 11-14 January 2019, Las Vegas, USA

Link zur Konferenz

Zusammenfassung:

The availability of global and scalable tools to assess disabled pedestrian level of service (DPLoS) is a real need, yet still a challenge in today’s world. This is due to the lack of tools that can ease the measurement of a level of service adapted to disabled people, and also to the limitation concerns about the availability of information regarding the existing level of service, especially in real time. This paper describes preliminary results to progress on those needs. It also includes a design for a navigation tool that can help a disabled person move around a city by suggesting the most adapted routes according to the person’s disabilities. The main topics are how to use advanced computer vision technologies, and how to benefit from the prevalence of handheld devices. Our approach intends to show how crowdsourcing techniques can improve data quality by gathering and combining up-to-date data with valuable field observations.

2018

Participants’ motivations to contribute to biodiversity citizen science projects
Konferenz ArODES

Lotfian Maryam, Jens Ingensand, Olivier Ertz, Sarah Composto, Mathias Oberson, Simon Oulevay, David Campisi, Florin Joerin

Proceedings of the Open Source Geospatial Research and Education Symposium (OGRS2018), Lugano. Switzerland, 9-11 October 2018

Link zur Konferenz

Zusammenfassung:

The public participation in scientific projects (citizen science) is significantly increasing specially with technology developments in recent years. Volunteers play an essential role in citizen science projects, therefore understanding their motivations, and understanding how to sustain them to keep contributing to the project are of utmost importance. This paper presents the analysis of volunteers’ characteristics and their motivations to contribute to a citizen science project, which aims at encouraging citizens to take action for biodiversity. The results from the online survey illustrate that people are more motivated by intrinsic nature-related motives rather than extrinsic motivations.

GeoSQL journey :
Konferenz ArODES
a gamified learning experience to introduce (or demystify) geospatial SQL queries

Romain Sandoz, Sarah Composto, Sandrine Divorne, Olivier Ertz, Jens Ingensand

Proceedings of the Open Source Geospatial Research and Education Symposium (OGRS2018), Lugano. Switzerland, 9-11 October 2018

Link zur Konferenz

Zusammenfassung:

In a digital world in the making, digital natives develop new learning profiles, interests, and way of working. Simultaneously teachers are facing students with lack of engagement and motivation with quite traditional learning process that has probably to be reframed considering the effects of digital transformation in the education sector. This issue is acute when it comes to complex subject of study, such as SQL geospatial to manipulate the geospatial characteristic of data. Indeed, some common difficulties have been identified by teachers from HEIG-VD university both in Media Engineering and Geomatics fields of study. The user-centered approach aims at creating digital products highly responding to the user’s needs through techniques improving the user experience. Various aspects have to be considered, including emotions. In education, gamification, along with user experience, interface design and usability best practices is one promising approach able to increase the learner’s engagement, interest and motivation. It aims to implement game mechanics within non-game context, in order to motivate the learner to accomplish a task and increase the ability to learn new skills. Using a gamification layer within a given context, being digital or not, act as a motivational trigger. It helps giving meaningful, enjoyable and empowering experience. SQL Island is a project from Kaiserslautern University of Technology which illustrates very well a gamified learning experience of the SQL special-purpose programming language. The GeoSQL Journey project goes further, tackling SQL geospatial to learn in a fun way how to manipulate the geospatial characteristic of data. It is a gamified pedagogical application to introduce the students to the practice of SQL geospatial during the first hours or days of the course. Serving as an initiation, it is designed to focus on intrinsic motivation (personal development, quest, challenge and fulfillment) with learning objectives determined and integrated with an engaging and coherent game world and narrative. This paper describes the early work of conceptual design of the GeoSQL Journey project. Game mechanics and game interface has been conceived and brought together according to the literature in the domain and best practices on this matter. The following step for this project is to elaborate a testing method without yet having to develop an application prototype (e.g. organizing a fairly raw tabletop game associated with a classic SQL console) so as to challenge the design with students and teachers to get their feedbacks. Also, it is envisioned to evaluate how existing open source gamification tools and frameworks would be suitable to develop the first prototype planned for the 2019-2020 academic year.

Augmented reality technologies for biodiversity education :
Konferenz ArODES
a case study

Jens Ingensand, Maryam Lotfian, Olivier Ertz, David Piot, Sarah Composto, Mathias Oberson, Simon Oulevay, Mélanie Da Cunha

Proceedings of the 21st Conference on Geo-information science, AGILE 2018, Lund 12-15 June, Sweden

Link zur Konferenz

Zusammenfassung:

Mobile technology is developing fast in recent years, and the price of mobile devices is dropping and becoming affordable for the majority of people. As a result, the use of smartphones and tablets is increasing at a rapid rate, even among children. Nowadays, in many countries, smartphones are being used at school as advanced teaching tools to motivate children to learn better. One of the recent examples is the utilization of Augmented Reality mobile applications for educational purposes. This paper is presenting an AR mobile application, which is encouraging children to learn about biodiversity. The application was evaluated during a field trip with 15 pupils of around 10 years of age, and the results illustrate the behavior of the pupils using the application, and the potential of the app to create a connection between the students and the nature. Moreover, analyzing the time the pupils spent on the application demonstrates a motivation among the pupils to find out about various species through a combination of an outdoor activity and a mobile application.

2017

GEOPOLL :
Konferenz ArODES
integrate cartographic questions in web forms, polls or surveys

Adrien Bigler, Olivier Ertz, Daniel Rappo, Sarah Composto, Florent Joerin

Proceedings of Free and Open source Software for Geospatial (FOSS4G) Conference

Link zur Konferenz

Zusammenfassung:

Most of the web forms, polls or surveys are composed with classical input fields (check boxes, radio buttons, select lists, etc.) and a lot of standards web forms builders or services (e.g. Typeform, WuFoo, Google Forms, Survey Monkey, etc.) help to build and deploy them. Nowadays, offering a text area to catch a ZIP code or a select list to point out a country remains the best way to explicitly collect geospatial data. But what about mapping interfaces to integrate cartographic questions and/or cartographic answers as a more suitable solution? How to let form’s respondents indicate in which area(s) they engage in certain activities? The only way to solve these issues is by coding it yourself. This paper shows the design and technical problematic and try to give some solutions to build an efficient UX for the respondents and a standard answers treatment for the data analysts. This paper will also highlight the capacities of open source JavaScript library like OpenLayers to build the solution. Our interface was tested by the cities of Lausanne and Pully (Switzerland) and thousands of people answered to these « cartographic forms » on mobile and desktop. We would like to share some good practice and lessons learned.

2016

Keys to successful scientific VGI projects
Konferenz ArODES

Jens Ingensand, Sarah Composto, Olivier Ertz, Daniel Rappo, Marion Nappez, Timothée Produit, Mathias Oberson, Ivo Widmer, Stéphane Joost

Proceedings of Open Source Geospatial Research & Education Symposium (OGRS2016), 12-14 October 2016, Perugia, Italy ; PeerJPreprints

Link zur Konferenz

Zusammenfassung:

Scientific projects are increasingly using volunteered geographic information (VGI) in order to collect and validate geographic data. This concept relies on the three challenges that first of all users can be found and second be convinced to collaborate and contribute and that scientists finally are able to gather high quality data for their projects. In this paper these three challenges are discussed using the experience with three different research projects: Urbangene, Signalez-nous and BioSentiers.

Implementation of tiled vector services :
Konferenz ArODES
a case study

Jens Ingensand, Marion Nappez, Cédric Moullet, Loïc Gasser, Olivier Ertz, Sara Composto

Proceedings of the Workshop on Spatial Data on the Web (SDW 2016), 27-30 September 2016, Montreal, Canada

Link zur Konferenz

Zusammenfassung:

Vector tiling aims at cutting vector data into smaller entities. It offers several opportunities, especially for the development of web-mapping systems, such as the possibilities to apply different styles, to access attributes or to render 3D data. Today no open and widely adopted standard exists for the implementation of web services involving vector tiles. In this paper we investigate several important parameters that need to be considered for the implementation of vector tile services. We then present a case-study where several tiled vector services are implemented. The results of this case study are useful for further implementations of tiled vector services and discussions regarding standardization.

2012

Symposium proceedings :
Konferenz ArODES
open source geospatial research & education symposium (OGRS 2012)

Olivier Ertz, Stéphane Joost, Marj Tonini

Link zur Konferenz

Zusammenfassung:

This book contains the extended abstracts of all contributions presented during the Open Source Geospatial Research and Education Symposium (OGRS 2012) held in Yverdon-les-Bains, Switzerland, October 24-26, 2012. OGRS is a forum for the exchange of knowledge, new solutions, methods, practices, ideas and trends in the domain of geospatial information through the development and use of geospatial free and open source software (GFOSS) in both research and education. The open source approach has many positive impacts; this is what OGRS wants to demonstrate in the context of geospatial research and education. In this regard, these proceedings cover numerous research and educational topics, with education constituting a new field of interest for OGRS.

2011

Cartographie et standard :
Konferenz ArODES
du modèle à l'utilisateur

Erwan Bocher, Olivier Ertz, Maxence Laurent, Gwendall Petit, Daniel Rappo, Gérard Hegron

Proceedings of 25th International Cartographic Conference, 3–8 July 2011, Paris, France

Link zur Konferenz

2010

Standard-centric authoring and publication for cartographic content
Konferenz ArODES

Olivier Ertz, Erwan Bocher, Maxence Laurent, Gwendall Petit, Daniel Rappo

Proceedings of WebMGS 2010: 1st International Workshop on Pervasive Web Mapping, Geoprocessing and Services, 26-27 August 2010, Como, Italy

Link zur Konferenz

Zusammenfassung:

Within the nascent GeoWeb, democratization of GIS and cartographic practices is on the way with more and more map makers and map consumers looking for answers to their geographic and cartographic needs. This paper explains how standards are used as common languages to open the doors of collaborative edition of cartographic content. As more and more users get stuck in the making of maps, this paper describes some solutions to create adequate mapping tools adapted to various user profiles of skills. Especially for thematic mapping, until now the field of specialists, map makers want to take benefits of the analytical power of such maps. This paper brings some elements to anticipate this phenomena. Also, this paper explains how structuring cartographic content helps to make publication easier. The aim of this paper is to develop an innovative method of cartographic publication based on a polypublishing/crossmedia approach : one source, many media, many targets. It defines a cartographic document that needs to be adapted to these different media and targets while benefiting from all the winning cards of each.

2009

Abstract proceedings :
Konferenz ArODES
International Opensource Geospatial Research Symposium, OGRS 2009

Erwan Bocher, Olivier Ertz

Link zur Konferenz

Zusammenfassung:

This book contains abstracts of all contributions presented during the first Open Source Geospatial Research Symposium (OGRS) that was held in Nantes City, France, from July 8th to 10th, 2009.

From point feature label placement to map labelling
Konferenz ArODES

Maxence Laurent, Éric D. Taillard, Olivier Ertz, Francis Grin, Daniel Rappo, Sébastien Roh

Proceedings of the MIC 2009

Link zur Konferenz

2007

Towards web services dedicated to thematic mapping
Konferenz ArODES

Olivier Ertz, Abson Sae-Tang

OSGeo Journal: the Journal of the Open Source Geospatial Foundation ; Proceedings of Free and Open Source Software for Geospatial FOSS4G 2007 Conference, 24-27 September 2007, Victoria, Canada

Link zur Konferenz

2002

Towards geoservices portals MEDIAMAPS :
Konferenz ArODES
WGIS trends for business applications

Olivier Ertz, Stephane Joost, Daniel Rappo

Proceedings of the Second International Conference on Web Information Systems Engineering, 3-6 December 2001, Kyoto, Japan

Link zur Konferenz

Zusammenfassung:

The developments within the MEDIAMAPS project were motivated by the idea to provide small and medium companies with a solution to benefit from Web Business Geographic Applications (WBGA) advantages at an affordable price: a Webmapping application service with which the user only pays for used data and analysis processes. As one of the goals of this research was to give users the possibility to produce printed documents with spatial analysis results (maps), the main preoccupation was to find a technology allowing high-quality cartographic representation. Our interest led us towards SVG (Scalable Vector Graphics), an open standard technology, official World Wide Web Consortium (W3C) standard for delivering vector graphics on the Web. From the development of this tool several recurring thematic mapping and publishing aspects have come out: statistical ranges determination and related colour problems, data types and choropleth mapping, cartographic publishing rules. The MEDIAMAPS prototype shows how this kind of specific constraints can be implemented in a WGIS application.

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