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I have:

  1. a raster file of land cover classes, the classes are urban, bare land, forest and agricultural land.
  2. a have a DEM, from which I can calculate the slope classes.

No I want to assign a new land cover class named steep cultivated land. The steep cultivated land is the cultivated land with slope greater than 25.

In other words, I want to divide the class named cultivated land into two classes steep cultivated land and flat cultivated land based on the slope calculated from the DEM.

How do I do this classification in ArcMap?

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  • If you wish to also ask about ArcGIS Pro and QGIS then please ask about them in separate questions.
    – PolyGeo
    Commented Jul 28, 2022 at 19:53

1 Answer 1

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In ArcMap you could:

  1. Generate a slope raster.

  2. Reclassify the resulting slope raster such that the steep slope range = 1 and all other slopes = NoData.

  3. Reclassify your land cover data such that cultivated lands = some unique value not in your land cover data, and all other values = NoData.

  4. Multiply the two reclassified datasets together. In this operation 1 x unique_number = unique_number and any_number x NoData = Nodata. All the pixels with a value of unique_number will be steep cultivated lands pixels.

  5. Use CON to place the steep cultivated pixels back into your land cover data.

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