[Gdal-dev] Error Message with gdalwarp

[Dobmeyer, Todd]

I have a .tif file showing the western the western half of the world.
The file is 246 MB in size which is way too huge to deal with. I want to
be able to type in the latitude and longitude coordinates of the area
that I would like to use instead of using the whole picture. I type in
the command:
 
C:\Support Libraries\gdal-1.2.0\apps> gdalwarp -te 30 135 45 60
land_shallow_topo_west.tif usa.tif
 
Land_shallow_topo_west.tif is the file that contains the western
hemisphere and usa.tif is the file that I would like to be created. 30,
135 is the latitude and longitude that I would like to put the
lower-left corner at and 45, 60 is the upper right corner. But when I
try this command with the .tif file in the apps folder, I receive this
error.
 
ERROR 1: Unable to compute a transformation between pixel/line
 
and georeferenced coordinates for land_shallow_topo_west.tif.
 
There is no affine transformation and no GCPs.
 
What does this error mean? Is there a way to type in two latitudes and
longitudes to cut out a section of my picture? Thanks for your help.
 
Todd Dobmeyer

 

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