What I need is a function for Non Earth Coordinates in QGIS (both projects and layers). They should be mappable to any projected coordinate system (like SWEREF99TM).

Why: In the Mining industry we often use Non Earth systems for different reasons. Like Geophysics we want to define North in a convenient direction. Could be South East we don't care about the real world at this stage. The same if an ore body is going south-east we may define that direction as north.

In many softwares (Microstation or MapInfo) we use we can have on the fly conversion between lets say myCoordinateSystem1 (cartesian system) to EPSG3006 no problem. But I have not found a good function for this in QGIS.

I wonder if the Proj4 limits QGIS so you can't do this? Any solutions for this?

  • EPSG3006 is found in qgis, and to add SWEREF99M usin like this "+proj=utm +zone=33 +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +units=m +no_defs" – Fran Raga May 8 at 9:51
  • How is the Cartesian system defined in MapInfo/Microstation? Are there control points in both systems? There has to be some way to georeference the local system to a projected/geographic coordinate system. – mkennedy May 8 at 18:12
  • The Cartesian system is defined as x,y,z. And the origio of that cartesian system is defined in one point in a earth system like Sweref99TM or WGS84. @mkennedy The system will then be set at that point. What MS and MapInfo does then is to fix scale issues. It will not be exact and the problem grows with distance. But when we do work in nature we are never in big areas so that gives us a problem. – PeterW May 9 at 10:49
  • @Fran Raga, yes I know that Sweref99TM is defined that is not the problem, I need a non earth system that I can relate to Sweref99 or WGS84 or whatever. Meaning that I define my own system with my own north and so on. Then I relate that to whatever geografical system and the software does a rotation and translation of my own defined system. – PeterW May 9 at 10:54

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