[Proj] WGS84 definition

Martin Vermeer martin.vermeer at hut.fi
Mon Dec 5 12:47:54 EST 2005

Dear List,

I found a nice explanation of the various realizations of WGS84 at the


I am sorry if this has been asked before, but what is the WGS84 that
proj4 (and GIS software in general) refers to? Of course this only
matters at the better than dm level, so is really only meaningful for 

The most sensible thing, I think, would be to refer to a realization
fixed to the local crust. I.e. in Europe, ETRF89. That way the
transformations are not time dependent -- though also not globally

Does this question have an answer, or a policy, within proj4?

- Martin

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