[Proj] help with clark66 as datum

Martin Vermeer martin.vermeer at hut.fi
Fri Mar 10 13:19:20 EST 2006

On Fri, Mar 10, 2006 at 09:30:27AM -0600, Clifford J Mugnier wrote:
> The DCW - Digital Chart of the World was HAND digitized by the Defense
> Mapping Agency in the early 80s from small scale "ONC" Operational
> Navigation Charts.  That became the defacto FREE dataset of the world's
> coastlines, rivers, etc used by all software companies including ESRI.  (It
> came on a 9-Track tape from DMA as did the GCTP come on a 9-track tape from
> the U.S. Geological Survey.)  The ellipsoid used as a default then was the
> Clarke 1866.  That is how it wound up being used for New Zealand.  (So was
> the entire world.)
> You have to be old enough to be able to remember this stuff!

Does this perhaps relate to the global coastline file 'ciakyst' ("CIA
coast") that I used in Denmark in the late 80s for plotting geoid maps?

- Martin

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