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Subject: FYI: Highly useful note on lat - long, position, and relationship to datums

The attached document was provided by Roger Lott., retired Chief Surveyor of BP Oil and currently chair of the OGP [epsg] Geodesy Subcommittee. Roger also participates in and contributes to the Coordinate Reference System (CRS) work  in the OGC and in ISO TC 211. I think it is a great document that explains the relationship between a lat-long coordinate and the associated datum - and what happens if datums are not properly specified. The reason for providing this document is we (in the OGC) are always encountering individuals that have heard the term Latitude-Longitude but are not necessarily aware of what using the term really means and why standards organziations are so picky about how the CRS information needs to be properly expressed.
And if anyone wants to dig more deeply:
Datums and Map Projections: For Remote Sensing, GIS and Surveying, Second Edition
Jonathan IIiffe and Roger Lott
Published: 2008-02-15, Taylor and Francis
ISBN: 9781420070415
Carl Reed, PhD
CTO and Executive Director Specification Program
The OGC: Helping the World to Communicate Geographically
This communication, including attachments, is for the exclusive use of addressee and may contain proprietary, confidential or privileged information. If you are not the intended recipient, any use, copying, disclosure, dissemination or distribution is strictly prohibited. If you are not the intended recipient, please notify the sender  immediately by return email and delete this communication and destroy all copies.
"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

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