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I am trying to isolate 3 different elevation ranges in QGIS (200-1200m, 1200-2200m, 2200-3200). I have made contour lines for each elevation but I want to make them into separate polygons so I can present data for each elevation range individually. Is there any way to do this?

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  • Are you asking how to create polygons from lines and then using the difference tool on them?
    – Erik
    Jan 12 at 12:26
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You can make polygons of contours directly.

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Then use Extract By Expression with an expression such as:

"ELEV_MIN" >= 1420 and "ELEV_MIN" < 1500

enter image description here

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