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Subject: RE: Why we need datum information
I know I am preaching to the choir, but if anyone ever asks why OASIS standards specify a datum when using lat/long coordinates, attached is an example (and short) explanation. Written by Roger Lott (geodesy geek extraordinaire and current chairperson of The International Association of Oil & Gas producers (OGP)).
Carl Reed, PhD
CTO and Executive Director Specification Program
Open Geospatial Consortium
The OGC: Making Location Count!
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"The important thing is not to stop questioning." -- Albert Einstein
"Security is mostly a superstition. It does not exist in nature. Life is either a daring adventure or nothing." -- Helen Keller
Latitude and longitude coordinates are not unique.doc