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I am trying to do the reverse / inverse of a euclidean distance in IDRISI (TerrSet). 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.

How do I create a raster that reverses the number in IDRISI?

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?

closed as too broad by PolyGeo Feb 13 '18 at 20:46

Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. Avoid asking multiple distinct questions at once. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

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    Asking about IDRISI in a separate question is the right thing to do but please try to focus this down to a single question (count question marks) after describing precisely what you have tried with IDRISI and where you are stuck with IDRISI. – PolyGeo Feb 13 '18 at 20:49
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as you mention, you are looking for the inverse, you may use any program with a raster calculator (qgis, grass, r) and calculate the inverse of the value for each pixel, that is, 1/distance.

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