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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>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:</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>C:\Support Libraries\gdal-1.2.0\apps> gdalwarp -te 30 135
45 60 land_shallow_topo_west.tif usa.tif</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>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.</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>ERROR 1: Unable to compute a transformation between
pixel/line</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>and georeferenced coordinates for land_shallow_topo_west.tif.</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>There is no affine transformation and no GCPs.</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>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.</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Todd Dobmeyer</span></font></p>
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