What value should be used for scale while calculating slope percent in QGIS?

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Some documents suggest is as 111120 and some as 365130.

I am using ESPG 4326 projection and do I need to convert this value to some other value using lat like given in this link:

How to properly get the slope from an ASTER DEM in QGIS?


1 Answer 1


The link you provided says:

scale=370400 (if elevation is in feet) or scale=111120 (if elevation is in meters)

So, what units are you using for elevation? Feet or meters?

And if you want to do this simpler, you could reproject to a CRS that uses the same units as your elevation measure.

  • how to know units used for elevation?
    – sudhanshud
    Sep 4, 2017 at 22:48
  • 1
    If you don't have metadata from the provider then check the height of some well known place.
    – user30184
    Sep 5, 2017 at 4:43

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