[Proj] +towgs84 approximation error

Jochem jochem.lesparre at kadaster.nl
Wed Mar 22 21:20:03 EST 2017


The transformation has been estimated by performing static GPS observations
on about 12 points of the old triangulation frame. Ofcourse these parameters
are not at 1 mm precise but more like a few cm. However, these parameters
have been in use for some time now. Therefore these parameters are
conventional* parameters and I need to keep to that convention within 1 mm.

I do not know the number of points to be transformed, the entire digital map
of a small country (probably a few million).  

*)  Van der Marel, 2016
page 33-34

Regards, Jochem

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