topic Re: raster calculator in ArcGIS Spatial Analyst Questions

raster calculator expression help for linear mapping

Anonymous User — Thu, 07 May 2015 22:14:28 GMT

So i have two raster (raster A and B) that represent maximum and minimum value of a parameter. I have another raster that reprensent the value that i want to use to calculate the values between the min-max range using this equation:

(?function?)*(-exp(rasterC))

The problem is that the result sometimes is not between the range in some cells. What kind of statistical function can I use for ?function? to remain between min-max range?

I used (Max-min/mean) for ?function?... but is not the correct function.

Re: raster calculator

SepheFox — Fri, 08 May 2015 02:12:56 GMT

If I understand your question correctly, you need the Con tool: Con (raster C, raster A, raster B, "value = 1")

Re: raster calculator

JayantaPoddar — Fri, 08 May 2015 04:44:31 GMT

In Raster Calculator, write a conditional statement like below:

Con(InRasC = 0, InRasA, Con(InRasC = 1, InRasB, InRasC))

Re: raster calculator

curtvprice — Fri, 08 May 2015 05:35:02 GMT

raster_a = min raster

raster_b = max raster

raster_c = 0 -> 1 raster

A linear mapping of C (0->1) on to the linear range of (B->A) is

"raster_a" + ((1.0 - "raster_c") * ("raster_b" - "raster_a"))

Re: raster calculator

SepheFox — Fri, 08 May 2015 14:05:43 GMT

Oh, I see now what he's looking for.