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I want to create a polygon with certain dimensions in QGIS. 180x180 feet.

I am trying to use advanced digitizing toolbar in order to create it. But I do not know the measurement units of d (distance) value. I am using EPSG: 3857. d values are not measured in units for sure, as I tried to create a polygon 100 m x 100 m by setting d = 100 and the dimensions of the generated poly are not 100m x 100m. Do you know how I can set or at least identify the measurements units of d?

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    Don't trust 3857 for anything involving distance -- Web Mercator is notoriously inaccurate for distance measurement; just look at Greenland and South America. – Vince Apr 5 at 1:13
  • Thank you Vince, you saved me from a lot of trouble – Stathis Apr 5 at 3:02
  • Use an equal-distance projection, or a local projection. – csk Apr 5 at 16:14

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