User Manual - pancroma

You can select your subset area either by clicking on the corners using themouse (in which case the pixel coordinates will appear in the Manual Data EntryPanel), keying in latitude and longitude coordinates (when available) or else youcan choose to enter the corners using the rubber band box. The pixel coordinatemethod allows you to select a point and then scroll using the slider bars to selectthe second point. When you use the rubber band box, your selection is confinedto the visible screen. The pixel coordinate method also lets you make as manyattempts as you like before selecting ‘Enter’. If your subset area is not too large,it is OK to leave the ‘Display Subset Images’ check box checked. With largersubsets that approach the full size of the image it will be necessary to uncheckthis box to avoid out of memory errors. When you select ‘Enter’, nothing obvioushappens. This is because the actual subsetting occurs when you save the file.This is necessary in order to minimize memory usage to allow larger subsets tobe processed.You save your file by selecting ‘File’|’Save Subset Image’ and choosing either‘jpg’ or .bmp. I decided to use .jpg format for this example. When I did so, mysubset images were presented as in the figure below. I called my files‘1106Subset’. PANCROMA TM appended the proper band identification onto thefiles when it saved them.311