Datum of GNSS (GPS) receivers

4 Nov 2021

Note: This information is only provided as a general reference and does not imply that Juniper Systems will provide full support for any specific GIS or other mapping system based on any specific datum, coordinate system, projection, or other references.

GNSS (GPS) receivers such as the Juniper Systems Geode and the u-Blox NEO M8 series (integrated into our Mesa 3 Windows and other rugged handheld computers) output messages in NMEA 4 format. When using these receivers with SBAS or Atlas L-band corrections they provide data based on ITRF 2014 Current Epoch spatial reference system. For further technical details, see ublox Geodetic Coordinate Systems and Ellipsoids.

If you are using NTRIP corrections within the USA (such as with the Juniper Systems Geode), in general, the spatial reference system will typically be NAD 1983(2011).

For information on how to apply a Datum Transformation with ESRI ArcGIS Field Maps, see:

Errors can occur when data (or other geo-referenced layers such as background imagery) are loaded using different map systems. For more information, see Geode appears to be inaccurate in good conditions and Geopositional accuracy of background imagery in mapping apps.

If needing assistance with GNSS/GPS datum transformations after the data has been collected, we have partners who provide such a service as described at the following web pages.

If you would prefer to try to figure this out on your own, some of the potential tools can be fairly technical such as the following.

https://geodesy.noaa.gov/TOOLS/Htdp/Htdp.shtml

 

Content of article last updated 23 Jan 2023, original article from 28 Feb 2020

Approved by JF, OS