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

[Billy Newman]

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.

Thanks again

On Sat, May 5, 2012 at 3:15 PM, Frank Warmerdam <warmerdam at pobox.com> wrote:

> On 12-05-05 01:19 PM, Billy Newman wrote:
>
>> Can you think of a way that I can get the same metadata as gdalwarp would
>> give
>> for a warped image without actually warping the image?
>>
>
> Billy,
>
> Just open the .vrt and read the corners (that is compute them from the
> size and geotransform).  There will not be any actual warping done just
> to get this metadata from the .vrt but you will get the result
> representative of the reprojected image.
>
>
> Best regards,
>
> --
> ------------------------------**---------+--------------------**
> ------------------
> I set the clouds in motion - turn up   | Frank Warmerdam,
> warmerdam at pobox.com
> light and sound - activate the windows | http://home.gdal.org/warmerda
> and watch the world go round - Rush    | Geospatial Software Developer
>
>
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