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<div class=Section1><pre><font size=2 face="Courier New"><span
style='font-size:10.0pt'>I have a .tif file showing the western the western half of the world.</span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>The file is 246 MB in size which is way too huge to deal with. I want to</span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>be able to type in the latitude and longitude coordinates of the area</span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>that I would like to use instead of using the whole picture. I type in</span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>the command:</span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'> </span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>C:\Support Libraries\gdal-1.2.0\apps> gdalwarp -te 30 135 45 60</span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>land_shallow_topo_west.tif usa.tif</span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'> </span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>Land_shallow_topo_west.tif is the file that contains the western</span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>hemisphere and usa.tif is the file that I would like to be created. 30,</span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>135 is the latitude and longitude that I would like to put the</span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>lower-left corner at and 45, 60 is the upper right corner. But when I</span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>try this command with the .tif file in the apps folder, I receive this</span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>error.</span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'> </span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>ERROR 1: Unable to compute a transformation between pixel/line</span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'> </span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>and georeferenced coordinates for land_shallow_topo_west.tif.</span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'> </span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>There is no affine transformation and no GCPs.</span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'> </span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>What does this error mean? Is there a way to type in two latitudes and</span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>longitudes to cut out a section of my picture? Thanks for your help.</span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'> </span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>Todd Dobmeyer</span></font></pre>
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