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SQL Server Tips by Gama and Naughter Consulting

 


Datums

A Geographic “Datum” is a standard on which coordinates are calculated on a map, chart or survey system. The basis of a datum is based on a reference ellipsoid as we have already discussed and before the advent of satellites, various techniques such as plumb bobs, surveying tools and astronomical observations. From this original starting point, further secondary points can be extended across a region or country. These Datum points are often found as concrete piers on the tops of mountains. A multitude of datums have developed as different countries and regions in the world started producing maps for their area. With the recent develop of systems such as GPS; an important area in GIS is in the correct translation of coordinates from one datum to another. This will be the focus of one of the XP’s implemented in XP_GIS and is discussed later in this chapter.


The above book excerpt is from:

Super SQL Server Systems
Turbocharge Database Performance with C++ External Procedures

ISBN: 0-9761573-2-2
Joseph Gama, P. J. Naughter

 http://www.rampant-books.com/book_2005_2_sql_server_external_procedures.htm

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