[PROJ] Time dependency in ETRFxx to ETRFyy coordinate transformations?

[Lesparre, Jochem]

> This week, I see 0.1 mm as totally acceptable rounding/etc. error.  1 mm is probably actually ok but socially unacceptable and 1 cm is IMHO a real problem.

For end-users, 1 cm measurement precision is the best they can get for points without a permanent GNSS station. To make sure the transformation accuracy is negligible, we require software to give correct results within 1 mm for the transformation to/from Dutch CRSs. To check this fairly with PROJ, 0.1 mm accuracy is indeed good enough.

For permanent GNSS stations a few mm is the best measurement precision we can get. So, for transforming GNSS station coordinates with PROJ, 0.1 mm accuracy is good enough too.

Jochem


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