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How to calculate percent area under diffrent categories from a interpolated map in QGIS ? | ResearchGate
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Calculate Geometry in QGIS: How to calculate line length, polygon area, and polygon perimeter – OpenSourceOptions
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Ujaval Gandhi on Twitter: "How to estimate the road width from a layer of road polygons using #QGIS? Testing with some dummy data, the simple expression 2*$area/$perimeter seems to give decent results.
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