You could also try using gdal_polygonize<http://www.gdal.org/gdal_polygonize.html>, but you'd need to find a way to reclass your source raster to discrete groups (i.e, elevation ranges). This could be done pretty easily using python, maybe something like val_repl.py<https://svn.osgeo.org/gdal/trunk/gdal/swig/python/samples/val_repl.py>.
-Jamie On Wed, Mar 11, 2009 at 12:56 PM, ValiSystem <[email protected]> wrote: > Hello ! > > I'm trying to generate polygons from gdal contour output. Most of the > linestrings generated where closed, so it's not a too bad start. The problem > is to define interior and exterior of the polygon : it seems that interior > and exterior has no consistent meaning from the linestrings (it makes sense > though - a line has no interior nor than exterior). > > So what i need would be a method to recreate the meaning of the polygon : > the inside is where i have ground. To make it work, i just would have to > transform the polygon to an interior ring of a wider (whole area) polygon > when appropriate (when it does not contain a polygon with a higher > altitude). > > What do you think about this ? is there a better/known way to achieve that > ? > > _______________________________________________ > gdal-dev mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/gdal-dev >
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