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SDFIdk / WEBPROJ

REST API exposing coordinate transformations with PROJ

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Implement support for System34 and other legacy CRS's without EPSG codes

kbevers opened this issue · comments

commented

This requires a rewrite of the transformation code. Depending on the CRS input from the user two paths are available:

  1. Both source and destination CRS are EPSG-codes
  2. Either one of the source or destination CRS is a none-standard EPSG code

The first path is what the code can handle right now. The second path requires logic that determines which non-EPSG CRS we are using and then initialising a custom pipeline that transforms between the source and destination.

commented

A 3rd path also exists: Both CRS's are non-EPSG codes, e.g. DK:S34S to DK:S34J or similar.

With the recently added commit this now works, although there may be undiscovered pitfalls when using coordinates of three or four dimensions.