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Microsoft® SQL Server 2008 R2 Unleashed
book

Microsoft® SQL Server 2008 R2 Unleashed

by Ray Rankins, Paul Bertucci, Chris Gallelli, Alex T. Silverstein
September 2010
Intermediate to advanced content levelIntermediate to advanced
1704 pages
111h 8m
English
Sams
Content preview from Microsoft® SQL Server 2008 R2 Unleashed

Working with Geography Data

The GEOGRAPHY data type is also implemented as a .NET common language runtime data type in SQL Server. Unlike the GEOMETRY data type in which locations are defined in terms of X and Y coordinates that can conceivably extend to infinity, the GEOGRAPHY type represents data in a round-earth coordinate system. Whereas flat models do not “wrap around,” the round-earth coordinate system does wrap around such that if you start at a point on the globe and continue in one direction, you eventually return to the starting point.

Because defining points on a ball using X and Y is not very practical, the GEOGRAPHY data type instead defines points using angles. The SQL Server GEOGRAPHY data type stores ellipsoidal (round-earth) ...

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Publisher Resources

ISBN: 9780768696585Purchase book