[FWTools] gdal_translate, -a_srs, -a_ullr, and Projections with Rotations
pwillis at aslenv.com
Wed Jul 22 12:59:28 EST 2009
Well, I tried with GCPs but no UTM geography is applied to
the output unless I supply the '-a_ullr' option. Using
-a_ullr causes the GCPs to be ignored and the same pixel
size calculation errors occur due to the rotation and
the actual bottom right coordinates with respect to the
gdal_translate appears to be calculating the pixel size
based on the UL and LR corners, which is normal. However,
with GCPs there should be more of a rotation/translation
applied to the geography.
Perhaps an option to override the pixel size calculations
in each dimension should be added to the utility...
Peter Willis wrote:
> I just noticed the '-gcp' option for gdal_translate.
> It occurs to me that this should provide the required projection
> Peter Willis wrote:
>> I am applying geography to some UTM based images.
>> The images have a 1.9 degree rotation.
>> Is there a way to assign a rotation to the projection
>> using gdal_translate?
>> If not, is there a way to assign the rotation using
>> any other GDAL tools?
>> FWTools mailing list
>> FWTools at lists.maptools.org
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