[Proj] Datum shift for Dutch maps 1850-2000

Duncan Agnew dagnew at ucsd.edu
Tue Nov 25 14:12:27 EST 2008

I should have said, where else can you sight from in the 
Netherlands--not a lot of topography to use;
church spires often have windows or other openings. Certainly Snel used 
them: see


for a detailed discussion of his triangulation.

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