Hello Michael

Le 15/04/2021 à 02:18, Michael Arneson a écrit :

I was not able to create the transformations by adding the parameters "src_semi_major", "dst_semi_major", however, I was able to create the transformation when I added in the parameters "tgt_semi_major", "tgt_semi_minor".

It is possible that "src_semi_major" and "src_semi_minor" are required as well. But if it works without them it is worth to try.

Could you take a look at the attached file and let me know if the modifications I have made to the WKTs are correct?

It seems close. But in the following parameters:

   PARAMETER["tgt_semi_major",6378137.0],
   PARAMETER["tgt_semi_minor",298.257223563]

the 298.257… value is the inverse flattening factor. Value for semi-minor axis should rather be 6356752.314245179 (computed from semi-major and inverse flattening factor).

    Martin


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