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This question already has an answer here:

Edit: Yes, using a DEM for a bigger area worked. However, now I'm getting crazy slope values, everything is around 90 degrees. It's a hillside vineyard, I don't think it's vertical.


I am trying to create a slope from a clipped DEM. The DEM is for a small plot of land, as you can see below. Each square is 30x30m.

enter image description here enter image description here The slope map is not registering values, just going from NaN to NaN.

marked as duplicate by Andre Silva, whyzar, aldo_tapia, xunilk, BERA Jan 5 '18 at 18:33

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    Do you have the DEM for a bigger area? I think the algorithm needs the surrounding pixels as well. – underdark Jun 21 '17 at 16:04
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    Yes, that did it. But now I'm getting crazy slope values, everything is around 90 degrees. It's a hillside vineyard, I don't think it's vertical. – Boris K Jun 21 '17 at 19:40
  • @BorisK Which is the CRS of your layer? I see that the project CRS is EPSG:4326 (i.e. a Geographic Coordinate System) and the OTF is active. – mgri Jun 22 '17 at 7:35
  • Changed it to EPSG:32718 to play nice with Google Earth. Still giving me slope values of 89...something. – Boris K Jun 22 '17 at 8:05

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