How to create proj4 definition of local coordinatesystem

by CarLo91   Last Updated October 15, 2018 20:22 PM

i have to generate a proj4 definition string from affine transformation parameters (A-F).

For example:

I have a local coordinatesystem based on EPSG:31466

The affine parameter are:

  A = 0.933176825,
  B = -0.358394718,
  C = 2557551.066,
  D = 0.358262137,
  E = 0.933522886,
  F = 5635190.282

Coordinates of 31466:

2575489,2435

5729759,4565

coordinates of local coordinatesystem:

50600.9577413499

81876.1639280757

but how to translate the affine parameter to a proj4 string? i need it for gdal and geoserver



Answers 1


PROJ gurus--Please feel free to edit and/or add your own answer!

proj5 just added the ability to include an affine transformation to the transformation pipeline a few weeks ago (approximately 1 Oct 2018).

There's an ongoing project to add support for the transformation pipeline into GDAL and QGIS over the next months.

So, it's not there yet.

mkennedy
mkennedy
October 15, 2018 20:20 PM

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