Drawing polygon constant km around point in lat/lon coordinates in QGIS3.12

Asked Jul 21 '20 at 14:28

Active Jul 21 '20 at 14:28

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I have a set of points in lat/lon coordinates over Europe representing pixels from a satellite dataset. I know each pixel has size 10x10km.

I want to draw a square polygon around each single pixel with the size 10*10km. I have tried reprojecting and then drawing a square around it using the "Rectangles, ovals, diamonds" tool. But every time I get this way too big square drawn around the results (see the image below). I am not exactly sure how to fix or even tackle this issue.

I have tried the methods suggested in this question as well.

asked Jul 21 '20 at 14:28

B.Quaink

1

I would guess they are only square in the original projection of the satellite image so you need to go back to that – Ian Turton Jul 21 '20 at 14:54
Buffer them by 5000 m using a m-based CRS (probably EPSG 3857, since your AOI is very large) and set the buffer end cap style to square and the join style to miter. – Erik Jul 21 '20 at 15:02
Hi Erik, they're already in EPSG:3857 and I've reprojected them as well. Selecting that as CRS still gives the same issue. – B.Quaink Jul 21 '20 at 15:11
What is the CRS of the point layer? – Stu Smith Jul 21 '20 at 17:05
Geographical coordinates, WGS84. – B.Quaink Jul 22 '20 at 07:57

Drawing polygon constant km around point in lat/lon coordinates in QGIS3.12

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