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Raster Change analysis with Two dates: Hurricane Rita This blog provides a simple example of change detection analysis using remotely sensed images from two dates. To measure change, we will use a vegetation index (NDVI) to examine how the vegetation and surface was affected by the hurricane.I use two images from the MODIS Terra Sensor (MOD09) to examine if the impact of Hurricane Rita is visible on the ground. Hurricane Rita was a category 3 hurricane that made landfall on September 24, 2005 in the southwest Louisiana coast.