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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 Regards
Carl Reed, PhD
CTO and Executive Director Specification Program OGC The OGC: Helping the World to Communicate Geographically
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Latitude and longitude coordinates are not unique.doc
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