09/18/2007 by Jeff Maxted This model was originally developed to produce an image that contains bands representing common change indices. It was specifically designed to highlight areas that have been altered as a result of extreme flooding in Wisconsin during the month of August 2007. The model is intended for use with Landsat 5 images. (This is because the Tasseled Cap Transformation coefficients are specific to the Landsat Thematic Mapper.) BEFORE RUNNING THE MODEL from within Erdas Imagine Modeler, the user should change the following setting in the Modeler window: Model --> Set Window... --> Set Window To: INTERSECTION When running the model from within Erdas Imagine Modeler, the user will be prompted three times to specify input images. These images should include the following, IN ORDER: 1) A "before" Landsat 5 image that includes 7 bands. (Unsigned 8 bit) 2) An "after" Landsat 5 image that includes 7 bands. (Unsigned 8 bit) 3) A "mask" image. This is a binary image (ones and zeros) that specifies the area of interest. (Pixels within the area of interest should have values of 1). The mask image should overlap the Landsat images. Important recommendations: - The analyses conducted in this model may be affected by the presence of large bodies of water within the area of interest, such as the Great Lakes. It is recommended that the mask image exclude these areas. - The analyses do not account specifically for cloudy areas. It is recommended that the area of overlap between the images and the area of interest be relatively free of clouds. The output image will contain the following bands: Band 1: Change in NDVI between the two time periods. Band 2: Change in MSI (Moisture Stress Index) between the two time periods. Band 3: Change in the Tasseled Cap "Brightness" value. Band 4: Change in the Tasseled Cap "Greenness" value. Band 5: Change in the Tasseled Cap "Wetness" value. Band 6: PC Band 2 (PCA conducted on stack of TM bands 2-5 from both time periods.) Band 7: PC Band 3 (") Band 8: PC Band 4 (") On a Intel Xeon 1.98 GHz processor, processing time was approximately one hour. The author does not retain any copyright for this model. It may be freely distributed.