[Proj] Datum shift for Dutch maps 1850-2000

Duncan Agnew dagnew at ucsd.edu
Tue Nov 25 13:12:11 EST 2008

I suspect that in the Netherlands in the 1850's* church towers *were* 
stations--where else could you see
from? 650 m is about 20 arcsec, which is, I agree, too large for 
observational error (or for deflection of
the vertical).

Duncan Agnew

*and before--going back to Snel.

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