Hello,

I want to to do the following thing: I want to create NoData if the change of the slope angle between cells is >30%

But I dont know what I have to do to realize it.

What I did is:

-Used Fill for the DEM --> Fill_DEM

-Used Slope (Percent and Degree) for Fill_DEM --> Slope_Percent & Slope_Degree

What should I do next? I really have no idea since i am very new into Arcmap

Thank you so much for your help!

Mheinz

I want to to do the following thing: I want to create NoData if the change of the slope angle between cells is >30%

But I dont know what I have to do to realize it.

What I did is:

-Used Fill for the DEM --> Fill_DEM

-Used Slope (Percent and Degree) for Fill_DEM --> Slope_Percent & Slope_Degree

What should I do next? I really have no idea since i am very new into Arcmap

Thank you so much for your help!

Mheinz

Hi Markus,

The easiest way to do this (in my opinion) using the Raster Calculator tool:

SetNull("slope percent" > 30, "slope percent")

The above expression will set all cells of the raster "slope percent" with a value greater than 30 to NoData; the rest of the cells will retain their value. (The input raster is unchanged -- the Raster Calculator tool will save the results to a new raster.)

By the way, Fill is used when you are going to computing flow direction. If slope is what you're interested in, you're probably better off using the original, un-filled DEM.