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!