I have a satellite image from Landsat TM. I want to clip my area so i created a polygon and thru Qgis --> raster clipper I am trying to clip my area of interest. I noticed that the results have different values. e.g My first image has minimum 0, maximum 179 and mean 36.966. after clipping the result has values minimum 6, maximum 112 and mean 51.55. Is there something obvious that I can not see? Did the values change because the size of image is different after clipping?
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