Lidar_profil_tool_2015
- 1. Danube Delta National Institute Develop tools for processing LIDAR data Ion Grigoras
- 2. Reasons to makeReasons to make web mapweb map application for LIDARapplication for LIDAR datadata • Provide wide access to differentProvide wide access to different type of users (engineers, biology,type of users (engineers, biology, policy makers, etc.)policy makers, etc.) • The access can be controlledThe access can be controlled • Tools developed according withTools developed according with users needsusers needs
- 3. How to do it ?How to do it ? • Convert LIDAR data in raster format. • Define user needs • Choose the programming environment
- 4. What we had doneWhat we had done • Convert LIDAR data in PostGIS raster table • Define user needs: display, interrogate, profile and profile point location on map, printing • Select OpenSource library and products for programming environment (php, GeoExt, ExtJS, Mapserver, Geoserver
- 5. And of course programming!And of course programming!
- 6. Programming meansProgramming means troubles but also results!troubles but also results! • ST_Intersects raster function in PostGISST_Intersects raster function in PostGIS have some particularity undocumented (Ihave some particularity undocumented (I must dig to find a solution)must dig to find a solution) • Big amount of data transferred formBig amount of data transferred form PostGIS to web map interface for longPostGIS to web map interface for long profile (solved with adaptive number ofprofile (solved with adaptive number of cells transferred).cells transferred).
- 7. So, web map application haveSo, web map application have now a profile button!now a profile button!
- 8. You need to put the map and profileYou need to put the map and profile on documentation?on documentation? • The print profileThe print profile button will generate abutton will generate a png image file of thepng image file of the profile that is on screenprofile that is on screen The print map buttonThe print map button will generate a pdf filewill generate a pdf file with scale adapted towith scale adapted to the screen.the screen.
- 9. Next step?Next step? •In our view, is to put object height coming from LIDAR data in PostGIS. •Develop tools to analyze this data (maps for vegetation and buildings high, vegetation profile,…). •Promote the existing tools, investigate the needs for tools.
- 10. Till you really need tools, feelTill you really need tools, feel free to play with it!free to play with it! Temporary web address:Temporary web address: http://85.204.145.163/Lidar/http://85.204.145.163/Lidar/
- 11. Acknowledgements for ROSA/ Cosmomar project that support part of research
- 12. Thank you for yourThank you for your attentionattention and don’t forget to ask for new tools!and don’t forget to ask for new tools!