J-S, from the looks of the coords, your original file may have already been
in UTM to begin with. When you ran gdal_translate -a_srs WGS84 file.tif
file.wgs84.tif you assigned a WGS84 projection to what appears to be a UTM
tif file. Can you double-check this?
Glenn
On Mon, Sep 29, 2008 at 11:34 AM, Jean-Sébastien Guay
[EMAIL PROTECTED] wrote:
Hi all,
This is probably just a sign of my inexperience in using gdal and
GeoTiffs... I'm getting this error message when trying to convert a GeoTiff
to UTM (in meters):
gdalwarp -t_srs +proj=utm +zone=32 +datum=WGS84 +units=m
file.wgs84.tif file.utm.tif
ERROR 1: Too many points (441 out of 441) failed to transform,
unable to compute output bounds.
This is the info of the file:
gdalinfo file.wgs84.tif
Driver: GTiff/GeoTIFF
Files: Gjoa-fledermaus.wgs84.tif
Size is 6190, 7250
Coordinate System is:
GEOGCS[WGS 84,
DATUM[WGS_1984,
SPHEROID[WGS 84,6378137,298.2572235630016,
AUTHORITY[EPSG,7030]],
AUTHORITY[EPSG,6326]],
PRIMEM[Greenwich,0],
UNIT[degree,0.0174532925199433],
AUTHORITY[EPSG,4326]]
Origin = (548676.250,6807000.000)
Pixel Size = (0.955613893376414,-0.956137931034483)
Metadata:
AREA_OR_POINT=Area
Image Structure Metadata:
INTERLEAVE=PIXEL
Corner Coordinates:
Upper Left ( 548676.250, 6807000.000)
(548676d15'0.00E,6807000d 0'25769803776.00N)
Lower Left ( 548676.250, 6800068.000)
(548676d15'0.00E,6800068d 0'25769803776.00N)
Upper Right ( 554591.500, 6807000.000)
(554591d30'0.00E,6807000d 0'25769803776.00N)
Lower Right ( 554591.500, 6800068.000)
(554591d30'0.00E,6800068d 0'25769803776.00N)
Center ( 551633.875, 6803534.000)
(551633d52'30.00E,6803534d 0'25769803776.00N)
Band 1 Block=6190x1 Type=Byte, ColorInterp=Red
Mask Flags: PER_DATASET ALPHA
Band 2 Block=6190x1 Type=Byte, ColorInterp=Green
Mask Flags: PER_DATASET ALPHA
Band 3 Block=6190x1 Type=Byte, ColorInterp=Blue
Mask Flags: PER_DATASET ALPHA
Band 4 Block=6190x1 Type=Byte, ColorInterp=Alpha
The first thing I noticed is that what is in the SPHEROID section doesn't
seem to match the other coordinates in the file, but I'm not sure that's the
problem, and even if my hunch is correct, I don't know how to fix it.
For reference, the original file (which I got from importing point data
into some third party software and then exporting a GeoTiff from it) had
this info:
gdalinfo file.tif
Driver: GTiff/GeoTIFF
Files: Gjoa-fledermaus.tif
Size is 6190, 7250
Coordinate System is:
PROJCS[unnamed,
GEOGCS[unnamed,
DATUM[unknown,
SPHEROID[unretrievable - using WGS84,6378137,298.257223563]],
PRIMEM[Greenwich,0],
UNIT[,0.0174532925199433]],
UNIT[unknown,1]]
Origin = (548676.250,6807000.000)
Pixel Size = (0.955613893376414,-0.956137931034483)
Image Structure Metadata:
COMPRESSION=LZW
INTERLEAVE=PIXEL
Corner Coordinates:
Upper Left ( 548676.250, 6807000.000)
Lower Left ( 548676.250, 6800068.000)
Upper Right ( 554591.500, 6807000.000)
Lower Right ( 554591.500, 6800068.000)
Center ( 551633.875, 6803534.000)
Band 1 Block=6190x1 Type=Byte, ColorInterp=Red
Mask Flags: PER_DATASET ALPHA
Band 2 Block=6190x1 Type=Byte, ColorInterp=Green
Mask Flags: PER_DATASET ALPHA
Band 3 Block=6190x1 Type=Byte, ColorInterp=Blue
Mask Flags: PER_DATASET ALPHA
Band 4 Block=6190x1 Type=Byte, ColorInterp=Alpha
and I got file.wgs84.tif by running
gdal_translate -a_srs WGS84 file.tif file.wgs84.tif
on it.
Any hints would be appreciated. Thanks in advance,
J-S
--
__
Jean-Sebastien Guay[EMAIL PROTECTED]
http://www.cm-labs.com/
http://whitestar02.webhop.org/
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--
Glenn Waldron : Pelican Mapping : http://pelicanmapping.com :
+1.703.652.4791
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