Danube Delta National Institute

Develop tools for processing LIDAR

data Ion Grigoras

Reasons to makeReasons to make web web map application for map application for LIDAR dataLIDAR data

•Provide wide access to Provide wide access to different type of users different type of users (engineers, biology, policy (engineers, biology, policy makers, etc.)makers, etc.)

•The access can be controlledThe access can be controlled

•Tools developed according Tools developed according with users needswith users needs

How to do it ?How to do it ?

• Convert LIDAR data in raster format.

• Define user needs

• Choose the programming environment

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

And of course And of course programming!programming!

Programming means Programming means troubles but also results!troubles but also results!

• ST_Intersects raster function in ST_Intersects raster function in PostGIS have some particularity PostGIS have some particularity undocumented (I must dig to find a undocumented (I must dig to find a solution)solution)

• Big amount of data transferred form Big amount of data transferred form PostGIS to web map interface for long PostGIS to web map interface for long profile (solved with adaptive number profile (solved with adaptive number of cells transferred).of cells transferred).

So, web map application So, web map application have now a profile button!have now a profile button!

You need to put the map and You need to put the map and profile on documentation?profile on documentation?

• The print profile The print profile button will generate button will generate a png image file of a png image file of the profile that is on the profile that is on screenscreen

The print map The print map button will generate button will generate a pdf file with scale a pdf file with scale adapted to the adapted to the screen.screen.

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.

Till you really need tools, Till you really need tools, feel free to play with it!feel free to play with it!

Temporary web address:Temporary web address:http://85.204.145.163/Lidar/http://85.204.145.163/Lidar/

Acknowledgements for ROSA/ Cosmomar project that

support part of research

Thank you for Thank you for your attention your attention

and don’t forget to ask for new tools!and don’t forget to ask for new tools!