Assigning Probability to Cells

Discussion created by esava on Jul 10, 2012
Hello all,

I am working with the image on the attachment and I am trying to find how many pixels are in the grey corners of the image, and I want to assign them a probability of 5%. The bottom layer is my DEM and the top layer is a Raster of distances. I know how many pixels I have on my raster layer, however I am not sure of how I can get the pixels outside of the circles and how to assign those pixels a probability. I would appreciate any help I can get!