Problems calculating relief using the raster calculator

Discussion created by jtholton on Apr 3, 2014
Latest reply on Apr 4, 2014 by lpinner

I have a question about determining relief in ArcMap. I need to determine relief based on a predefined radius around each cell in a    floating point 10 meter DEM I downloaded from NED. I believe my radius will be 1 km. I read a previous blog that said to use the      following code in the raster calculator:

FocalRange([grid], CIRCLE, [number of cells], DATA)

This is what I entered:

FocalRange("arcgrd3arcsec", CIRCLE, 100, DATA)

After running this expression in the raster calculator, I received an error message that said this:

File "<expression>" line 1, in <module>

"File "<string>", line 5, in rcexec NameError: name 'FocalRange' is not defined.

Failed to execute (RasterCalculator)

I have tried multiple variations of this syntax and receive the same basic message.  Does anybody have any ideas on how to do this
or know of easier ways to determine relief?  Thanks so much.