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SQL Server Tips by Gama and Naughter Consulting

 


XP_GIS_LL2UTM

To convert from a coordinate expressed as a longitude and latitude pair to a UTM Northing, Easting and Zone identifier, XP_GIS_LL2UTM is provided. The actual implementation is provided in the helper function “LLtoUTM” which is based on the implementation provided by Chuck Gantz, which was posted to the sci.geo.geology newsgroup and is available at http://www.gpsy.com/gpsinfo/geotoutm/. The equations used in the function are themselves based on USGS Bulletin 1532. A UTM coordinate consists of an X coordinate called an “Easting” and a Y coordinate called a “Northing”. In addition the zone in which these coordinates are specified needs to be specified to uniquely identity a position on the Earth.

There are a couple of special cases related to UTM zones, which the code must also handle. The 32V UTM zone over southwest Norway is extended westwards squeezing the 31V zone to the left. This means that the 32V zone is nine degrees wide in longitude while the 31V zone immediately to the left is just three degrees in width instead of the normal six degrees. The second special case corresponds to the zones, which cover the Svalbard archipelago north of Norway where zones 32X, 34X and 36X have been removed altogether and zones 31X, 33X, 35X and 37X have been widened to fill the gaps.

This XP takes five parameters. The first parameter is the latitude, the second parameter is the longitude, and the third parameter is the datum to use. The final three parameters are the output parameters and contain the UTM Northing, Easting and UTM Zone.
 


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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