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I have a DEM layer with elevation ranges of -413-5593 m, just as seen below.

Elevation dem map

Then I determined the altitude between 4100 and 5400 m using symbology and band rendering, got the map below and the following black dots.

Points or areas that are above 4100 meters high.

Now I want to measure these points (The range of altitude that is between 4100 and 5400 meters), How can I calculate the area of these parts??

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  1. Create contour polygons with 100 m interval
  2. I had to fix geometries for next step to work (If you want to be able to calculate each single part polygons area also execute Multipart to Singleparts)
  3. Add geometry attributes.

enter image description here

This will create a polygon layer with an attribute of each 100 m intervals area. Select the intervals you want and use Statistics panel to calculate the sum:

enter image description here

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  • Thank you @Bera ,How can I choose a part of these sections that I want? For example, I want to calculate only a part of those zone (image 1) and I want to exclude the separated parts from the calculations?
    – Sina Kh.
    Feb 4 at 15:56
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    Multipart to Singleparts prior to Add geometry attributes
    – BERA
    Feb 4 at 16:26

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