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GPS- Deriving British Ordinance Survey Grid Reference from NMEA data - Part 1 - modify NMEAinterpret
The NMEA data exported by GPS units gives latitude and longitude and geometric distance above the WGS84 (GRS80) reference ellipsoid. The Ordinance Survey maps for Great Britain use grid references based on the Airy Spheroid (OSGB36) reference ellipsoid.
The following article discusses a C# class to convert GPS derived NMEA data to the British Ordinance Survey Grid.
This article assumes that the NMEA data is being derived using Jon Person's excellent NMEA interpreter class as discussed in Writing Your Own GPS Applications: Part 2.
In order to perform the transformation, some additional data is required in the form of ellipsoid height, which can be derived from the NMEA $GPGGA sentence.
The $GPGGA sentence is not parsed in the original from of the NMEAinterpreter so this must be added.
Google's virtual world Lively to die next month
(AP)
