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?