Hello all,
I'd like to have some feedbacks on an operation that should be possible
with Postgis raster, but I can't find out how to do this.
I have a whole raster of French DEM (elevation data) stored on PostGis,
with tiled objects. That makes a table with some 14.000 rows of data:
france_mnt (rid, rast, filename)
With ST_Value(france_mnt.rast, geometry), I can retrieve the elevation
of a given coordinates in the geometry object.
I'd like to create a new raster, on the fly, with a maximum value of
elevation, such as : all pixels with value < 10
This could be used for mapping water elevation in a area, for instance.
Anyone has already done this? I'll be happy to have some tips on the
function to use.
Thanks!
Gabriel
_______________________________________________
postgis-users mailing list
postgis-users@lists.osgeo.org
http://lists.osgeo.org/cgi-bin/mailman/listinfo/postgis-users
