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SQL Server Tips by Gama and Naughter Consulting


Coordinate Systems and UTM

A number of coordinate systems have been developed to define a point on the Earth. The most obvious and widely used system is Latitude, Longitude and Height. The latitude of a point is the angular measurement of a point north or south of the Equator. The longitude of a point is the angular measurement of a point east or west of the Prime meridian, which runs from the North Pole through Greenwich, England to the South Pole. The height, which is normally expressed in meters, is the height above the reference ellipsoid. Another popular coordinate system is Universal Transverse Mercator (UTM). This coordinate system is based on fitting a cylinder horizontally around each vertical prime meridian. This system provides coordinates on a world wide flat grid for easy computation. The grid divides the world into 60 vertical zones, each normally 6 degrees in longitude wide. These zones are numbered 1 to 60 in an eastwards direction starting from the International Date Line at 180 degrees. Horizontally UTM divides the Earth into regions from 80 degrees south latitude to 84 degrees north latitude. These vertical divisions are commonly referred to by a letter, from C at the bottom to X at the top. The letters I and O are excluded to avoid confusion with the numbers one and zero. The Polar Regions are not included in the UTM system.

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





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