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NOAA Datums Videos 2014

Differential correction with NA2011 and the newest epoch of NAD83

See our and Datums Basics and GPS Tutorials for the long-awaited results of months of rigorous testing and peer review

Trimble Positions software has replaced Trimble GPS Analyst in ArcGIS 10.1

ALASKA GPS and GIS users - check out Joel Cusick's Datum and Projections presentation Feb 2013

ArcGIS 10.1 - New and Cool improvements see Presentation from Melita Kennedy, ESRI : Projections and Datums Dec 2012

Home GPS Tutorials Why post-processing is important
Why post-processing is important PDF Print E-mail

Storing and using autonomous GPS data (no real-time or post processing) would be the ONLY way to keep your data in WGS84 as it came from the satellites. This is not practical since...

The accuracy of this data is only accuracte to 15 m since it remains uncorrected

and

Most GIS datasets you will want to combine your GPS data are not WGS-84

Therefore it is impossible to avoid datum issues when moving GPS data to a GIS