Jay, do you basically want a footprint shape of the useful data in the
Sat images (say, without the collar), or is the problem more complex,
where perhaps you have a mosaic of several images and, like swiss
cheese, there are no-data holes within the image?
It sounds to me like you just want a footprint of the collarless area;
is this correct?
/Elijah
Jay Jennings wrote:
I see, thanks. But since I have satellite images, this part of the doc is alarming: "...For non-thematic raster data (such as satellite images)
the result will essentially be one small polygon per pixel, and memory and output layer sizes will be substantial. The algorithm is primarily
intended for relatively simple thematic imagery, masks, and classification results".
I just want one polygon enclosing the non-zero pixels (or alternatively, enclosing the zero pixels, then I could do a geometric
difference). Is there any way to trick the method into doing that, to maybe avoid the heavy resource needs ?
-----Original Message-----
From: Even Rouault [mailto:[email protected]]
Sent: Friday, April 22, 2011 11:45 AM
To: Jay Jennings
Cc: [email protected]
Subject: Re: [gdal-dev] Polygonize from C# ?
Selon Jay Jennings <[email protected]>:
Generally, refering to the C/C++ doc is a good way of finding the info :
See http://gdal.org/gdal__alg_8h.html#3f522a9035d3512b5d414fb4752671b1
Hi list,
Can anyone point to any guidance or (preferably) examples on using
GDAL.Polygonize() with C# bindings ? I see what the interface is, but there
are some unexplained parameters, e.g. "string[] options".
My eventual goal is to open a raster and produce a WKT POLYGON string
enclosing the "good" (non-NoData) area of the raster. Thanks.
.........................................................
Jay Jennings
Senior Software Developer
(NASDAQ: GEOY)
[email protected]
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