[gdal-dev] Gdal_Translate Geotransform error

[Sundaram Subramaniam]

Dear Andrew
i do have similar problem with gdal coordinate tranformation particularly with data georeferenced with geographic)lat/lon) coordinates. But it is Ok with map  GeoX/GeoY coordinates. Infact i could not even extract the values of geotransform from file with Geographic la/lon georeferenced. I think GDAL works only with projected map coordinates.
S.Subramaniam 
Scientist ,Land Resources Group, RS&GIS_Applications Area, 
National Remote Sensing Agency 
Hyderabad - 500 037 
INDIA


From: andrew.deklerk at gmail.comTo: gdal-dev at lists.osgeo.orgDate: Mon, 3 Dec 2007 10:05:32 +0200Subject: [gdal-dev] Gdal_Translate Geotransform error




Hi All 
 
I have done some searching to try solve my problem, but have been unsuccessful. I am relatively new to gdal, but not new to GIS. I apologise if my question's are basics..but an answer would help me significantly. I am running the latest build of Gdal for windows (1.43), and using the pre-compiled binaries. So here is my primary and secondary question: 
I have a tif file which i want to clip at certain coordinates, so I call the following command: 
 
"gdal_translate -projwin 16.25 -28.5 16.5 -28.75 H:\1_50000_April2007\2816\2816CB_2003_ED2_GEO.TIF 2816cb.tif" 
 
On running this i get the following error: 
"Input file size is 8267, 10629 
The -projwin option was used, but the geotransform is 
rotated.  This configuration is not supported." 
 
I have checked my input images and coordinates passed through with projwin, and all seem fine. Gdalinfo of the files reveals the following coordinate information: 
 
Upper Left  (  16.1928674, -28.4559735) ( 16d11'34.32"E, 28d27'21.50"S) 
Lower Left  (  16.1904570, -28.8619556) ( 16d11'25.65"E, 28d51'43.04"S) 
Upper Right (  16.5508568, -28.4576272) ( 16d33'3.08"E, 28d27'27.46"S) 
Lower Right (  16.5484465, -28.8636093) ( 16d32'54.41"E, 28d51'48.99"S) 
Center      (  16.3706569, -28.6597914) ( 16d22'14.36"E, 28d39'35.25"S) 
 
So my question is...what do I do to correct the error. I see no related messages between gdal_translate and geotransform. Do I need to do some programming to solve this problem? I shouldn’t think so, as what I am doing is pretty basic.
 
Second/third question is..if i do a straight translate to geotiff, my output image is 85Mb, while my input is only 6Mb (also tif, but with LZW compression) - how do I force LZW or export a file of the same size, or smaller, as the original?. I tried ECW but i received a "no support" message. Is ECW supported? 
 
Sorry for the long winded message, but i need to resolve this to do in Gdal. If it were just one image, I would use other GIS packages, but I have 2000 odd images to do and need to batch them 
 
Thanks 
Andrew
 
 
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