Smoothing hillshades that contain lots of details
How do you smooth hillshades that contain a lot of details (see attached image)? I’ve followed the instructions given on the Mapping Center to smooth hillshades, but it didn’t seem to work for me. I still get a lot of lines/noises on lower elevation surfaces. How can I get that smooth surface without all the details so that I can use it as a backdrop for my map? Thanks a lot for your help!
Mapping Center Answer:
This looks like a case of using DEM data that is in geographic coordinates but the elevation values are in meters or feet. In these situations, you need to use the Z factor option to essentially make the elevations values the same as your x and y coordinates (which would be in degrees). There is a blog entry called "Setting the Z Factor Parameter Correctly" that will help you.
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