Green Move Web Viewer: critical issues and implementation

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1 GIT Geology and Information Technology 8a Riunione del Gruppo di Geologia informatica Sezione della Società Geologica Italiana Chiavenna, giugno 2013 Polo Territoriale di Como Laboratorio di Geomatica Green Move Web Viewer: critical issues and implementation Maria Antonia Brovelli - maria.brovelli@polimi.it Marco Negretti marco.negretti@polimi.it

2 the Green Move project The Green Move project is a sustainable mobility project of Politecnico di Milano with the support of Regione Lombardia: it is an innovative service to share vehicles 2

3 the Green Move project Geomatics Labs main targets: design and development of a cartographic viewer design and implementation of a data sharing system supporting monitoring activities 3

4 vehicle data Vehicles can send continuously data position data from GPS battery level charge and many other... 4

5 guidelines Main aspect: INTEROPERABILITY Through: ADOPTION OF COMMUNICATIONS STANDARD 5

international standards (OGC) The Open Geospatial Consortium (OGC) is an international consortium with more than 400 members (companies, government agencies and

6 international standards (OGC) The Open Geospatial Consortium (OGC) is an international consortium with more than 400 members (companies, government agencies and universities) The goal is to develop standard interfaces to support interoperable solutions that "geoenable" the Web OCG Web Services (OWS) 6

7 system architecture client OWS browser OWS server DB webgis webserver cartography 7

8 OWS standards used OGC Web Services (OWS) currently operational services: Web Feature Service (WFS) Web Map Service (WMS) operational soon Sensor Observation Service (SOS) Web Processing Service (WPS) 8

9 software used PostGIS - Geographic data support POINT, LINESTRING, POLYGON,MULTIPOINT, MULTILINESTRING, MULTIPOLYGON, GEOMETRYCOLLECTION Geographic data operators Importation tools from various data format Permit direct access to data from GIS software MapServer - OpenLayers - 9

10 OWS server client WFS/WMS 4326 PostgreSQL PostGIS 4326 WMS WFS server WMS WFS Coordinates System WGS84 - geographic coordinates system => EPSG:4326 WGS84/UTM32N - projected coordinates system => EPSG:32632 WGS84 Pseudo-Mercator - projected coord. syst. => EPSG:

11 webgis browser 4326 WMS WFS server PostgreSQL PostGIS webgis webserver WMS Reg. Lombardia OpenStreet Map Google Maps

12 OWS server desktop GIS ex. QGIS 12

13 OWS server On-line web services Portale Cartografico Nazionale 13

14 OWS server 14

15 OWS server Portale Cartografico Nazionale 15

16 webgis 16

17 webgis 17

18 webgis link between car position and google street view front and back view updated with car position 18 and street view navigation page

19 vehicle position correction test with real data GPS coordinate are a bit wrong the vehicle position doesn't match always with a road It needs to define corrections tools It needs have a road network 19

20 vehicle position correction Evaluate whether it needs a own network road acquisition and maintenance a better positioning algorithm path analisys... Otherwise build the positioning algorithm with less constraints as possible only geometry no topology no directions info 20

21 network road: OpenStreetMap (OSM) OpenStreetMap (OSM) is a collaborative project to create a free editable map of the world data access via web Data can be also downloaded there are four layer: osm_mi_line osm_mi_point osm_mi_polygons osm_mi_roads Data imported in PostgreSQL/PostGIS 21

22 OSM data Data evaluation process 22

23 OSM data Line layer any type of path (road, railway, pedestrian way,... ) 23

24 OSM data It needs to filter the line layer data osm_mi_strade all the elements that have set highway field with consistent value "discarded" values: pedestrian, raceway, path, footway, cycleway, bridleway, steps, proposed, construction, escape; 24

25 OSM data It needs to filter the line layer data osm_mi_strade 25

26 vehicle position correction - 1 search the nearest network link (within a distance range) there are errors at the crossroads 26

27 vehicle position correction - 2 to improve the correction tool evaluate: proximity to road link comparison between orientation road link and orientation car moving 27

28 GRAZIE! 28

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