[Gdal-dev] Using the warp api

[Matt Lynch]

Hi Frank,

You nailed it.  I forgot to close hOutDataset.

Thanks!

Matt

-----Original Message-----
From: gdal-dev-admin at remotesensing.org
[mailto:gdal-dev-admin at remotesensing.org] On Behalf Of Frank Warmerdam
Sent: Thursday, August 28, 2003 2:50 PM
To: gdal-dev at remotesensing.org
Subject: Re: [Gdal-dev] Using the warp api


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.

Matt,

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 sensibly.

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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