[Proj] +towgs84 approximation error

Jochem jochem.lesparre at kadaster.nl
Thu Mar 23 07:49:24 EST 2017

Hi Martin,

Indeed it would be better to give people using the approximated formulas an
error than for the people that use the strict ones.

The "late-binding" will not solve these problems, since also for parameters
between system A and B the rotation angles are too large for the approximate

In my case:

Frame A -> WGS84

WGS84 -> Frame B

Frame A - > Frame B
NB: I did not simple add the parameters, but used strict formulas to combine

Therefore, I'm still convinced that the formulas of +towgs84 should be

Regards, Jochem

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