Has anyone had the problem that the scale of the shp layer converted originally from a .dxf file turns out to be wrong?
For example, I draw a line of 10 meters long in AutoCAD and imported it in QGIS, however the length of this line turns out to be several thousand kilometres.
Best Answer
Google satellite (EPSG:3857) is not a good idea. The units are metres, but only at the equator. The more to the North you go, the greater the difference gets.
Alternatively, you can use a custom CRS in transverse mercator projection, with latitude and longitude of origin (in degrees) at the point where your dxf file has its origin: