User Manual - pancroma

We are going to use a very obvious feature to demonstrate change detection inthis example: cloud cover. The base image subset area has very little cloudcover, while the changed target has a lot. If change detection works properly, weshould expect the cloud cover to be highlighted as a very measurable change.The next step is to co-register the bands. There are several ways to do this butthe easiest is probably to use the six file subsetting method. This method willcrop the images to the Maximum Common Extents coordinates and rescale theimages if necessary so that the row and column counts will match exactly. (TheMaximum Common Extents are the corner coordinates of the common areabetween the two scenes). The main proviso with this technique is band filelabeling. Since the utility was designed for gap filling, you have to be careful toget your file naming conventions set so that your registered band files do not getconfused.PANCROMA TM provides a file-naming tool in order to facilitate this if you chooseto use it. To illustrate its use, suppose that we have two Landsat scenes asfollows:Group 1 Group 2L71005068_06820030919_B10.TIF L71005068_06820040804_B10.TIFL71005068_06820030919_B20.TIF L71005068_06820040804_B20.TIFL71005068_06820030919_B30.TIF L71005068_06820040804_B30.TIFL71005068_06820030919_B40.TIF L71005068_06820040804_B40.TIFL71005068_06820030919_B50.TIF L71005068_06820040804_B50.TIFL71005068_06820030919_B70.TIF L71005068_06820040804_B70.TIFStart by opening the first three bands of Group 1 and the first three bands ofGroup 2, in order:273