Potentiel des données d OpenStreetMapd des transports routiers. Quality of Navigation data in OpenStreetMap (OSM)
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1 Navigare 2010 GNSS in ITS: the way of co-operation 30th of June 2010 EPFL- Lausanne Potentiel des données d OpenStreetMapd pour la télématique t des transports routiers Quality of Navigation data in OpenStreetMap (OSM) A. Deshogues, A. Ueberschlag, P.-Y. Gilliéron EPFL (Lausanne) OSM? Free and collaborative since 2004 OpenSource API : GNU GPL Data : Creative Commons BY-SA
2 OSM? Impulsed by volunteers OSM? An incomparable reactivity of the community
3 OSM? Example of the Haitian earthquake Motivations Research at the Geodetic Engineering Laboratory: - Management of data quality in road information system - Use of navigation data for road telematics OSM How good is OSM data? What are the expected applications?
4 Steps and project organisation References and concepts - Spatial data quality - Conceptual schemas for ITS - OSM quality in England via Muki Haklay s studies from UCL Technical definition - Student s s semester project - Test area : Genève - Period : September to December 2009 Agenda - Choice of dataset - Assessment and visualisation of data quality - Geometric completeness - Geometric accuracy - Semantic completeness - Semantic accuracy - Visual comparison -Results - Potential of OSM data for navigation and road telematics - References and Internet
5 Choice of the input data OpenStreetMap Geofabrik WGS 84 October 2009 Graphe routier Système d Information du Territoire de Genève Swiss Grid October 2009 TeleAtlas WGS Transformation to system WGS 84 Focus on the test area Genève Map of reference Geometric completeness Reference The best database corresponds to the higher total length SQL : Total length of segments Data OSM RC OSM RN SITG RC SITG RN TeleAtlas RC TeleAtlas RN Roads length (km) Total length of roads by categories OSM data has geometric completeness of high quality for the major road axis RC: Cantonal Roads RN: National Roads
6 Geometric accuracy Reference Buffer Reference : Goodchild, 1997 MapBasic Tables of overlapping percentage Roads or Street name Corresponding OSM-SITG % Corresponding OSM-TeleAtlas % Rue du Général Dufour Avenue Henri Dunant Boulevard Helvétique Chemin de Ruth Quai Wilson Route de Lausanne Quai Gustave Ador Route de Lullier Autoroute A m : Cantonal Roads 8 m: National Roads OSM-TeleAtlas OSM-SITG Corresponding regarding a road selection. Corresponding : <50 % 51 à 60 % 61 à 70 % 71 à 80 % >90 %
7 Attribute completeness Reference Number of roads with the attribute «Name» via an SQL query SELECT count(*) from OSM SELECT count(*) from OSM WHERE OSM.Name <> SQL: Count of roads with attributes OSM RC OSM RN SITG RC SITG RN TeleAtlas RC TeleAtlas RN Total roads number Percentage of roads with attributes Roads with attributes 62% 100% 91% 100% 86% 100% OSM s attribute definition is incomplete RC: Cantonal Roads RN: National Roads Attribute accuracy Reference Database comparison of the attribute «Name» OpenStreetMap / SITG OpenStreetMap / TeleAtlas SQL: Name comparison Cantonal Roads Roads number grouped by Name OSM : 1280 SITG : 2483 OSM : 1280 TeleAtlas : 2757 National Roads 0 1 Roads number grouped by Name OSM : 2 SITG : 7 OSM : 2 TeleAtlas : 2 Percentage of corresponding Only half of the roads (OSM) are correctly registered
8 Visual comparison Reference Visual comparison of the OSM, the SITG and the TeleAtlas data on 3 different zones with specific land cover: Visual comparison Down town (high building density) Industrial area and motorway junction Maps Residential area (back country) No data unaccurate OSM Tele Atlas
9 No data Unaccurate OSM Tele Atlas No data Unaccurate OSM Tele Atlas
10 Visual comparison results Zone order regarding 4 criteria Geometric completeness Geometric accuracy Accuracy of the traffic junctions GPS imprecision Count of contributors Reference Download of the *.osm data via the JOSM interface and counting of contributors numbers. Count of contributors High numbers of contributors = completeness? accuracy and Zones Tables with number of contributors Contributors number Zones 1 and 2 looks consistent Zone 3 : not significant * 10 Dec
11 Synthesis OpenStreetMap Geofabrik Genève SITG TeleAtlas WGS 84 Changement de projection WGS 84 Densité de population OFS Recadrage sur la zone d étude de Genève Reference Nombre de noeuds et densité de population Décompte nombre de contributeurs Buffer MapBasic Somme des longueurs des segments Comparaison du nom Décompte des routes avec attributs nom Comparaiso n visuelle Tableau Tables regroupant les contributeurs Tables de % de recouvrement Longueur totales des routes selon la catégorie % de correspondance % de routes avec l attribut nom Cartes How good is OpenStreetMap? Geometric accuracy High quality / Low Geometric completeness High Attribute accuracy Low Attribute completeness Low Volunteers number High Users repartitions / Future work and improvement: Precision and semantic completeness
12 Perspectives for the road telematics Through this study, we notice that OSM is, for the moment, not the most complete and stable database for road telematics applications. However this concept of VGI and open source license motivates a lot of people. Propositions : - To develop a toolbox within OSM programs highlighting the regions where the OSM data (tracks or attributes) is missing (large and local scale). - To encourage data owners to participate to the project - To generalize this approach to Switzerland for a better assessment of OSM quality Perspectives for the road telematics Visualisation and valorisation of the geographic information : Use the API as a background information for GIS or Web-mapping interface. Calculus: Advanced navigation tool such as EPFL :
13 References Conceptual schema for road network : Carles, O., (2002), Modèle conceptuel de données génériques pour la représentation des réseaux intermodaux. Spatial data quality : Devillers, R., Jeansoulin, R., (2005), Qualité de l information géographique. OpenStreetMap: - Ramm, F., Topf, J., (2008), OpenStreetMap : die freie Weltkarte nutzen und mitgestalten. - F.Van der Biest, C.Moullet, C.Philipona,(2010) OpenstreetMap: plateforme collaborative mondiale de l information Géographique libre. Géomatique suisse 6/2010 page Études de UCL Muki Haklay : Interesting URL Open Street Map presentation: Tools and software available:
14 Interesting URL Statistics : Import BMO : Walking Papers : MapOSMatic : OpenSeaMap and OpenAerialMap: and OSM with WMS : and Welcome to new volunteers And many thanks for your attention. Arnaud Deshogues +41 (21) Ecole Polytechnique Fédérale de Lausanne (EPFL) Laboratoire TOPO arnaud.deshogues@epfl.ch 28
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