Dividing a raster by another raster

BenColeman — Tue, 08 Nov 2011 15:54:39 GMT

Hi, I was wondering if anyone could help with my current problem?

I currently have two rasters. One is an intensity of space use, varying from 3%-100%, the other is a kernel density estimate of predator risk ranging from 0-10.28. What I'd like to do is divide the intensity of space use by the predation risk.

When I tried to do this in raster calculator all I got was a raster which ranged from -3.40282e+038 to 3.40282e+038.

Can anyone tell me what I'm doing wrong?

Many thanks

Ben

Re: Dividing a raster by another raster

JeffreySwain — Wed, 09 Nov 2011 10:19:47 GMT

There are many things to consider with the simple divide and I would be sure you have used the snap raster to prevent pixel registration error and be sure that the spatial extents overlap as desired. You do not want any NoData value pixels to be used in the divide process. With that being said, for your output, I would see if you have generated statistics on the raster and be sure that you have a stretch applied. Also use the identify button and see what pixel values are actually in your raster. If they are all the same value or all NoData then there was a problem with the divide. Check the statistics and stretch first.

topic Re: Dividing a raster by another raster in ArcGIS Spatial Analyst Questions

Dividing a raster by another raster

Re: Dividing a raster by another raster