Is there a way of creating a buffer (elliptical I guess) in QGIS that has independent distances to the North, South, East & West (from the attribute table) so the buffer could be 5m wide to the North, 4m to the East, 6m to the South & 2m to the West? This is to show tree crown dimensions on a map.
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1Try Rectangles, ovals, diamonds processing tool. At least possible to specify width and height– BERAOct 9, 2020 at 18:02
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1 Answer
You can consider to use the geometry generator to do this job for you. The geometry generator will only generate the geometry of your symbol. The example below has a point theme with 4 attributes: "n", "s", "e" and "w" for your values and makes a polygon symbol with this four values with the expression:
smooth(
make_rectangle_3points(
make_point($x-"w",$y-"s"),
make_point($x-"w",$y+"n"),
make_point($x+"e",$y+"n")),
3)
it takes the pointgeometries ($x and $y) and generates a rectangle with the values from "n", "s", "e" and "w", which will be smoothed afterwards:
