I am trying to do the reverse / inverse of a euclidean distance. For example, I am doing distance to roads analysis. The output from the distance raster shows roads as 0 and areas closest to roads as 0.1, 0.2, etc and the areas furthest from roads as a very high value. However, I would like the raster to be the reverse of this - the areas closest to the roads should have the highest values and the areas furthest from the roads should have the lowest values. Specifically, the areas closest to the roads are 0.001 and the areas furthest from the roads are 3000. I would like the reverse - the areas closest to the roads to be 3000 and the areas furthest from the roads to be 0.001. How do I create a raster that reverses the number?
I would use reclass but this would be difficult to use as the values are continuous and not integers. Is there a way to do this in reclass or raster calculator that I am not aware of for continuous values without overgeneralizing them? Or is there a different tool that I can use?
I am trying to do this in IDRISI so if any of you know how to do it in this program, that would be exceedingly helpful. If not, I am definitely happy with ideas on how to do this in ArcGIS, and then I can import the file into IDRISI after editing it in ArcGIS.