The contour map that I generate from a Maps Made Easy (MME) DEM produces a distorted result and I’d like to learn how to correct the problem.
Shown is a pool that has been physically measured to be rectangular. To visualize that the edges are orthogonal I’ve rotated the clip and place a rectangle over it (lower left).
Next, I imported the MME DEM into QGIS and generate a 5 ft interval contour map (upper right). Notice that the rectangular pool contour is a rhombus. If the result is exported as a DXF, the DXF file contains a rhombus. Oddly the MME GeoTIFF looks like a rhombus too in QGIS, but not in a TIFF viewer.
To illustrate the distortion, the QGIS contour is rotated and a rectangle has been placed over it (lower right).
I’ve changed the CRS to Google Pseudo Mercator, as recommended by MME, but the distortion does not change.
How can I eliminate the distortion?