[Gdal-dev] Using the warp api

Frank Warmerdam warmerdam at pobox.com
Thu Aug 28 16:49:36 EDT 2003

Matt Lynch wrote:
> Hi,
> I have been working my way through the warp api tutorial
> (http://www.remotesensing.org/gdal/warptut.html), but have run into
> trouble.
> My program takes an image and reprojects it to a new file out.tif.  When
> I run it, I don't get any errors.  However, out.tif is essentially
> black, with a few lines.  If my description of the output is not
> sufficient, I can email the file out.tif to you.
> Any help would be most appreciated.


The code mostly looks OK, though it is a bit hard to tell since there is
a fair amount going on and that could be going wrong.  One fairly serious
thing that I didn't see was a GDALClose() for hOutDataset.  This might well
account for some of the problems if not all.

If fixing that doesn't help, then I would suggest you invoke the transformer
you passed to the warp algorithm to make sure that values are being mapped

Best regards,

I set the clouds in motion - turn up   | Frank Warmerdam, warmerdam at 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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