[FWTools] gdal_polygonize

[Roger André]

Hi John,

I wrote a very un-optimized tool to do this a little while ago.  It's a
Python script that you can probably run in FWTools.  Just be sure that you
put it in your FWTools/bin directory, and then that you create an
appropriate environment setting script with the same name in
FWTools/bin_safe.  Just do a search for gdal_merge.py and you'll see what I
mean.

You'll need to do some editing of the script to specify the pixel values you
want to vectorize, but that should be pretty straight-forward.

Good luck, and let me know if you need any help getting it to run.

Roger
--

On Wed, Apr 8, 2009 at 8:03 PM, John Zastrow <jcz at northredoubt.com> wrote:

> We need to vectorize a large class raster (landuse) that we produced
> using spatial analyst. ArcGIS is refusing to take it further and our
> friends at ESRI are stumped. So, we are ready throw some FOSS tools at
> the problem and the next step is to simply vectorize about 12 raster
> classes into a vector that we'll clean up from there. I  think
> gdal_polygonize (http://www.gdal.org/gdal_polygonize.html) will help me
> get the product out. But, I tried two types of FWtools installs for
> Windows (osgeo and maptools) and was bitten by the "old gen" problem
> with each.
>
> I'll happily kick over to Ubuntu-based linux or keep on Windows if
> someone can recommend a surefire way to get gdal_polygonize running
> quickly - or recommend a replacement.
>
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