that's a very interesting option ! I think i could write a tool in C++
to do the grouping, and use the original line strings for the elevation
lines/text.
thanks a lot
On 12/03/09 17:26, Jamie Adams wrote:
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]
<mailto:[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 ?
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