[gdal-dev] gdalwarp cutting off projected image

Scott Lewis scott.lewis at nsidc.org
Tue Dec 9 18:33:13 EST 2008


The image I've been trying to convert is at this URL.  It's about 6MB, 
hopefully that's not too big.


Basically, I'm trying to convert it to a plain-old EPGS:4326 (latlong 

I appreciate you taking a look.


PS - I'm still new to the GDAL list; when you say file a Trac ticket, 
where would I do this?

Scott Lewis wrote:
> I've been having problems getting it staged.  As soon as I'm able to 
> I'll send the URL.  Maybe the source geotiff file doesn't have the 
> information necessary to convert correctly, perhaps.
> Again, thanks for your help.  Hopefully I'll have the URL soon.
> Scott
> Frank Warmerdam wrote:
>> Scott Lewis wrote:
>>> Frank,
>>> Thanks for the help.  I tried doing this, and ended up with the same 
>>> image (even diff found them to be the same).  Here are the various 
>>> commands I tried.  Maybe I'm just using the -wo option wrong.
>>> gdalwarp -t_srs EPSG:4326 -wo SOURCE_EXTRA=1000 input.gtiff.tif 
>>> output1.gtiff.tif
>>> gdalwarp -t_srs EPSG:4326 -wo "SOURCE_EXTRA=1000" input.gtiff.tif 
>>> output2.gtiff.tif
>>> gdalwarp -t_srs EPSG:4326 -wo "SOURCE_EXTRA=1000 SAMPLE_GRID=YES 
>>> SAMPLE_STEP=100" input.gtiff.tif output3.gtiff.tif
>>> I'll continue to play with those options, though.  gdalwarp seems to 
>>> not act any different (IE, it takes the same amount of time to 
>>> process) with or without the -wo option, so I'm thinking I'm just 
>>> not using the option correctly somehow.
>>> Again, I appreciate your help!
>> Scott,
>> I suspect I've misconstrued what is going wrong.  If you can stage
>> the input file somewhere, and if it isn't too terribly huge, I would
>> be interested in trying it myself.  Ideally this could be filed as a
>> Trac ticket.
>> Best regards,
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