Output of raster calculator produces only whole number pixels
I am conducting a normalized burn ratio using the raster calculator tool. The formula is (band 4 - band 7)/(band 4 + band 7) and expected output is a range of numbers between -1 and +1. TIFF images of bands 4 and 7 were obtained from USGS. These are 8-bit unsigned images with pixels ranging in value from 0 to 255.
The resulting output raster is only composed of pixels with whole integer values of -1 and 0. But when I query pixels on the two tiff images (bands 4 and 7) a wide range of values are found.
What should I do in order to obtain the proper range of pixel values?
Mapping Center Answer:
Try changing your data type to floating point -- you can use the Float tool to do that.
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