Hello,
Thank you Jukka, that worked.
I just shifted the coordinate of the origin to another location and
everything worked.
Peter
-Original Message-
From: gdal-dev-boun...@lists.osgeo.org
[mailto:gdal-dev-boun...@lists.osgeo.org] On Behalf Of Jukka Rahkonen
Sent: February-05-14 5:03 AM
To: gdal-dev@lists.osgeo.org
Subject: Re: [gdal-dev] How Can I gdalwarp From One Image to a Larger
Spatial Area While Leaving Missing Data Blank in the Destination?
Peter Willis pwillis at aslenv.com writes:
Hello,
Sorry about the title but it's a bit of a bear finding answers if the
headers don't show the actual topic.
But I digress.
My Issue:
I have an input image that covers coordinates 0,0 to 450,350 UTM zone
13 North and the pixel size is 1 meter.
I want to mosaic pixels 0,0 to 25,25 into a coverage of UTM
coordinates
-25,-25 : 25, 25 at the output in 1 meter pixels.
This should show a 25x25 square portion of the image in one corner of
the
50x50 output image.
'gdal_translate' will not do this because -25,-25 are outside the
bounds of the original image.
I have tried the following with gdalwarp:
gdalwarp -overwrite -te -25 -25 25 25 -tr 1 1 ./input.tif
./output.tif
This does not work. I get the following error:
ERROR 1: Unable to compute a transformation between pixel/line and
georeferenced coordinates for ./input.tif.
There is no affine transformation and no GCPs.
There is geography applied to the input file.
What am I doing wrong ?
Hi,
This is funny. GDAL seems not to believe in images with origo at 0,0.
I tested with some dummy png file
gdal_translate -of gtiff -co tfw=yes -co profile=baseline test.png test.png
test.tif Input file size is 588, 321
0...10...20...30...40...50...60...70...80...90...100 - done.
It does not create a tfw file. Now this fails gdalwarp test.tif test2.tif
ERROR 1: Unable to compute a transformation between pixel/line and
georeferenced coordinates for test.tif.
There is no affine transformation and no GCPs.
I made tfw file test.tfw by hand as
1
0
0
-1
0
0
and then this is successful
gdalwarp test.tif test2.tif
Creating output file that is 588P x 321L.
Processing input file test.tif.
0...10...20...30...40...50...60...70...80...90...100 - done.
and also what you want to do
gdalwarp -te -1000 -1000 1000 1000 test.tif testi3.tif Creating output file
that is 2000P x 2000L.
Processing input file test.tif.
0...10...20...30...40...50...60...70...80...90...100 - done.
So I feel there is a bug if corner coordinates are 0,0. Please verify with a
handwritten tfw file and images with origo at, let's say, 1,1.
-Jukka Rahkonen-
Thanks for any help.
Peter
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