[gdal-dev] gdalwarp cutting off projected image

Frank Warmerdam warmerdam at pobox.com
Tue Dec 9 12:07:51 EST 2008

Scott Lewis wrote:
> Hi,
> I'm fairly new with GDAL, and have been working with a coworker who is a 
> little more familiar with GDAL and gdalwarp, but we are both stumped by 
> this particular issue.
> I have a GeoTiff image that is in a north polar Lamber Azimuthal Equal 
> Area (laea) projection.  I am trying to reproject it using gdalwarp to a 
> cylindrical projection (like EPSG:4326).  I am using the following command:
> gdalwarp -t_srs EPSG:4326 input.gtiff.tif output.gtiff.tif
> The tool runs OK, but when I open output.gtiff.tif, the projection is 
> "incomplete".  The parts that are there look correct, but it seems 
> everything above about 50 degrees is cut off, like the input.gtiff.tif 
> had a big circle around 50 degrees cut out before the reprojection was 
> made.
> I've tried looking at the options for gdalwarp, but can't seem to find 
> anything that would help.


There are various challenges in pole (or even dateline) spanning
reprojection operations.  The options at:


may be helpful.

In particular, you might try specifying -wo SOURCE_EXTRA=1000 or some similar
large value on the gdalwarp commandline.  It is also possible that the
SAMPLE_GRID=YES and SAMPLE_STEPS=100 options might help but generally if
you have lots of RAM and a not-too-big input image specifying a large
SOURCE_EXTRA value will resolve the issues.

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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