What is the unit of length of a vector arrow scaled by a specific scale in QGIS?
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3Is that a line layer? What QGIS version do you have?– BERAOct 9, 2022 at 16:07
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Actually it's a raster data and my QGIS version is 3.26.3– Yusen TOct 10, 2022 at 1:56
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1 Answer
A scale factor should be dimensionless, i.e. a line with a length of 1m and 100px scaled 10x should be 10m and 1000px respectively.
The resulting value should still be in the original unit.
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Sure but as the dialog doesn't let you specify a length or unit for the arrow how do you know what you scale ?– J.ROct 14, 2022 at 8:41
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@J.R check github.com/qgis/QGIS/blob/… and the relevant comment
Algorithm how to transform vector magnitude to length of arrow on the device in pixelsfrom github.com/qgis/QGIS/blob/… Oct 14, 2022 at 9:21