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Add Geometry Attributes (Length, Area, Perimeter) or X / Y Coordinates to Shapefiles in QGIS – RASHMS.COM
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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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coordinate system - How to Get QGIS to calculate Area in Layer's Units? - Geographic Information Systems Stack Exchange
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Calculate Geometry in QGIS: How to calculate line length, polygon area, and polygon perimeter – OpenSourceOptions
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How to calculate percent area under diffrent categories from a interpolated map in QGIS ? | ResearchGate
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polygon - Calculating cumulative sum of area values in attribute table by graphics in QGIS - Geographic Information Systems Stack Exchange
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