Hi Dan, basically it takes a euclidean distance raster and then using 3 distances (defined by the %D...%) applies 3 assumptions of risk (%R...%) so for example D0 may be 0 and the chance of success may be 0 (R0), at DA the chance of success may still be 0 (RA) but then at DB the chance of success is assumed to be 1 (100%) (RB). Does that make sense? From D0 to DA the cells value will be 0 but from DA to DB they will gradually increase from 0 to 1.
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