[gdal-dev] Gdaltindex without NODATA areas

[Jukka Rahkonen]

Hi,

Gdaltindex creates simple rectangular polygons. When images are warped the
resulting tileindex polygons will overlap. This is ok when tileindex is used as
an image catalogue by Mapserver.  However, sometimes it would be useful to have
an image catalogue showing the real image data areas. Is there a tool for
creating such a catalogue, or relatively simple instructions about how that kind
of catalogue could be created? I imagine that taking the image extent rectangles
as a starting point but clipping away NODATA areas (perhaps dug out with a
system like gdal_polygonize using some "create_only_NODATA_polygons") might give
the desired result.

-Jukka Rahkonen-