[Proj] +towgs84 approximation error

[Jochem]

PS:

Noel, I read your email again, and I think I misunderstood your suggestion
for the "challenge". It is not about the strict/approximate formulas, but
only about correlated/uncorrelated parameters, right? Then we can do it
exactly as you suggested. I still see it as an experiment. I am really
interested in the outcome, not in winning.

Kind regards, Jochem




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