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I want o create one slope map for my model but I have one big problem.
I have contours lines and mass points and I create a DEM using topo to raster but if I want to create a slope map from that DEM I take a wrong slope map.

Look my image:

enter image description here

The yellow lines in the red frame are wrong,that is my contours lines I think so why show me that problem?

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Make a terrain from your contours and mass points then terrain to raster with the natural neighbours method, this will give a smoother raster - not necessarily more accurate but won't jump as much.

  • I tried what you said but did not have any different the same errors not chenge . – hellas May 24 '14 at 3:47
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    When you built the terrain did you use contours as type 'contour'? if you use them as hard line you will get the same problem. – Michael Stimson May 24 '14 at 6:34
  • yes i use that..and i use soft line – hellas May 24 '14 at 9:22
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    So do the sudden slopes match with contours? Is their elevation set correctly (z height or elevation attribute)? Contours are a model, usually cartographic, and don't align well with exact changes in elevation. You can sometimes get better results if you remove points close to contours. – Michael Stimson May 24 '14 at 9:38

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