[gdal-dev] Is a way to just get the minimum bounding polygon of just the image.

[keith lewis]

John,

OSSIM has a command-line tool that might be helpful. It is called
"extract_vertices" and outputs the 4 corners of the true image data.

Here is an excerpt from the document -

Used to compute the valid vertices (corners) of an image. Defines a polygon
- inside the polygon are valid sampled pixels outside are nulls.

extract_vertices <image_file>

You may need to install OSSIM to get the command-line tools.

http://download.osgeo.org/ossim/

Keith
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