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2 Overview
14 AgGPS 332 GPS Receiver User Guide
24.5 Coordinate systems
Geographic data obtained from different sources must be referenced to
the same datum, ellipsoid, and coordinate format. Different formats
provide different coordinate values for any geographic location. In
North America, the datums NAD-27 and NAD-83 are commonly used in
Agricultural mapping applications.
The AgGPS 332 receiver outputs position coordinates in several datums
and ellipsoids depending on the GPS positioning method being used.
See Table 2.3.
For more information, go to the National Geodetic Survey website at
www.ngs.noaa.gov/faq.shtml#WhatDatum.
Table 2.3 DGPS coordinate systems
GPS positioning method Datum Ellipsoid
None – Autonomous mode WGS-84
1
WGS-84
OmniSTAR VBS North American Beams NAD-83
2
GRS-80
OmniSTAR VBS Rest of World Beams ITRF
3
GRS-80
OmniSTAR HP ITRF 2000 ITRF 2000
WAAS Beams WGS-84 WGS-84
Beacon NAD-83 NAD-83
OmniSTAR XP ITRF 2000 ITRF 2000
RTK WGS-84 WGS-84
1
World Geodetic System (WGS) 1984. Datum and ellipsoid.
2
North American Datum (NAD) 1983. Equivalent to WGS-84 in North
America.
3
International Terrestrial Reference Frame (ITRF). Contact the DGPS provider for details.