[FWTools] gdal_polygonize

[Roger André]

Hi John,

Glad to hear you got output.  Unfortunately, no, I don't have a dissolve
function written that can be plugged into this.  I had started to write one
last year, as dissolving raster extents was something I needed to do
occasionally, but I always ended up doing that step in ArcGIS instead.

Roger
--

On Thu, Apr 9, 2009 at 4:43 AM, John Zastrow <jcz at northredoubt.com> wrote:

> Roger André wrote:
>
>> 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
>> --
>>
>>
>
> Hi Roger,
>
> Thank you very much. Your script did produce a shape output. Do you know if
> there is a method to do the "dissolve" on the polygons either inline with
> the vectorizing or as secondary step? Googling turns up people searching for
> such a tool in the GDAL/OGR world but, I did not see any final conclusions.
>
> Thank you,
> John
>
>
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