On 11-03-10 05:07 PM, Wendell Turner wrote:
Is there a way to force pixels outside of the cropping
polygon to be 'not there', or transparent?  Is there a burn
value that indicates that?

Wendell,

The -dstnodata parameter can be used to set the output nodata value.  I'm
not sure if it will properly mark that value as no data or not and whether
the end application honours nodata values in geotiff is ... variable.

Another approach is to use -dstalpha to add an alpha channel to the output.

Best regards,
--
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I set the clouds in motion - turn up   | Frank Warmerdam, warmer...@pobox.com
light and sound - activate the windows | http://pobox.com/~warmerdam
and watch the world go round - Rush    | Geospatial Programmer for Rent

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