topic Re: change range of raster in ArcGIS Spatial Analyst Questions

change range of raster

LanoYado — Mon, 19 Sep 2016 04:08:39 GMT

Hi, I have a raster layer that has values between 0.5 to 2.0. I want to change (narrow) the range of its values to be between [0.95 1.05]. Every cell value of the layer of course changes accordingly. Any tool or way in ArcGIS to do that?

Thanks in advance

Re: change range of raster

DanPatterson_Retired — Mon, 19 Sep 2016 06:16:24 GMT

don't know if there is a builtin but there are examples of rescaling data using python on the web

ie python - Convert a number range to another range, maintaining ratio - Stack Overflow

which is in theory could be implemented using The transformation functions available for Rescale by Function—Help | ArcGIS for Desktop using a linear scale function Rescale by Function—Help | ArcGIS for Desktop

but I haven't tried it

Re: change range of raster

NeilAyres — Mon, 19 Sep 2016 06:44:05 GMT

I had never seen that rescale by function tool. Very cool.Thanks Dan

Re: change range of raster

DanPatterson_Retired — Mon, 19 Sep 2016 07:03:54 GMT

Neil... There is a whole load of other functions in that associated list The transformation functions looking for a purpose...

Re: change range of raster

XanderBakker — Mon, 19 Sep 2016 13:17:18 GMT

You could use the raster calculator and apply something like:

((RasterValue - 0.5) / (2.0 - 0.5)) * (1.05 - 0.95) + 0.95

... to stretch the values linearly.

However I like the option provided by Dan_Patterson better.

Re: change range of raster

LanoYado — Mon, 19 Sep 2016 14:46:55 GMT

Thanks all. Very helpful.

Re: change range of raster

DanPatterson_Retired — Sun, 25 Sep 2016 00:10:49 GMT

I marked your question assumed answered, if that is alright, since you didn't select one