# Calculating slope change

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03-14-2022 08:47 PM
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New Contributor III

I need to find areas of rapid slope change greater than 10º.

I created a slope layer from a DEM.

If I create another slope layer from the original slope layer will I get the change in slope angles between adjacent cells (i.e. the slope of the slope between cells)?

Then I would simply run CON (spatial analysis) or RASTER CALCULATOR to isolate areas of slope change >10º, right?

If not, can anyone tell me how?

I'm using ArcGIS Pro version 2.9.1

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MVP Esteemed Contributor

curvature would have the dem as input.

noisy data... depends, you could always run a focal mean over the dem to smooth some of the irregularities if you feel they are present.  Experiment

Surface parameters... Surface Parameters (Spatial Analyst)—ArcGIS Pro | Documentation

why not have a run through, it might be revealing to look at the results as well

... sort of retired...
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MVP Esteemed Contributor

rate of change of slope

How Curvature works—ArcGIS Pro | Documentation

... sort of retired...
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New Contributor III

Huh! I think that's exactly what I need. You're a genius!

If I understand correctly, the input raster would be my DEM_Slope raster. Or am I confused here?

And what constitutes noisy data and how do I know if I have it? High resolution?

My cell size is 10mX10m. Is that high resolution? And if so, should I try the SURFACE PARAMETERS tool instead?

MVP Esteemed Contributor

curvature would have the dem as input.

noisy data... depends, you could always run a focal mean over the dem to smooth some of the irregularities if you feel they are present.  Experiment

Surface parameters... Surface Parameters (Spatial Analyst)—ArcGIS Pro | Documentation

why not have a run through, it might be revealing to look at the results as well

... sort of retired...
by
New Contributor III

Thanks for all your help, Dan! Twenty billion layers later, I discovered the right workflow. Couldn't have done it without ya!

MVP Esteemed Contributor