[gdal-dev] gdal.AutoCreateWarpedVRT returning different results than osr.CoordinateTransformation

[Frank Warmerdam]

On 12-05-05 02:22 PM, Billy Newman wrote:
> Still very confused.
>
> I have a tiff file.  I want to get the metadata for that tiff but in EPSG:4326,
> without actually warping the image.  I can use CoordinateTransformation to do
> this, but again it gives me different results than gdalwarp.
>
> I will use gdalwarp later (realtime) to serve out an image.  But if the
> metadata I store (from CoordinateTransformation) is different than the metadata
> when I warp I will run into problems.
>
> gdalwarp gives something like minLon = 30.300001234, but
> CoordinateTransformation gives minLon = 30.29988787.  I want to gdalwarp number
> but without actually warping the entire image.
>
> I am not sure what .vrt file you are talking about.

Billy,

The subject line of this thread is about AutoCreateWarpedVRT().  I'm talking
about the VRT created by it.  Note that creating the VRT does not actually
do any work to warp the image - it just create a description of how the
warp would be done in the form of a pseudo-dataset - a VRT.

Best regards,
-- 
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I set the clouds in motion - turn up   | Frank Warmerdam, warmerdam at pobox.com
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