I want to draw a schematic process diagram in QGIS (yes, I really want, because I can document my data in the table) but it seems impossible to create a CRS that is simple Cartesian (x,y). Anyone can give me a hint?

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You could use any projected CRS you like, they are all simple Cartesian grids, but don't use a geographic (lat/lon) CRS. You could use EPSG:27700 for example.

  • my problem is, there ar all not realy northing, meaning, that the grid ist not exact perpendicular to the canvas. lets see if i can upload a image . . – FHR Feb 9 '19 at 11:37
  • as you can see in the image, the cartesian grid (EPSG 3857 in this case) is not perpendicular to the canvas and that ist disturbing – FHR Feb 9 '19 at 11:44
  • sorry, you are right, i had made my layer in EPSG 32720 an was showing in 3857. that was the problem! – FHR Feb 9 '19 at 11:51

If you go to project properties, CRS tab you can turn on the "no projection" option. This should achieve what you're after.

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