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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 Datums Office Guides

The accumulation of ‘small errors’ in your data adds up quickly.

Therefore it is key to use the correct datum transforms with the latest updates. As datums are updated, the transforms and software should be updated accordingly.  Surprisingly, this isn’t always the case even with most commonly used GIS packages. 

All users should ‘do the right thing’ and update and install the latest transformations manually as needed.  

These articles show you how.

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# Article Title
1 LATEST .PRJ and .GTF files for ArcGIS : NAD83(2011, MA11, PA11) Projections and Transformations (2013)
2 LATEST NAD83(2011) .csd file - Transformations for GPS Pathfinder Office (2013)
3 LATEST Geoid12A and transformation files for GPS Pathfinder Office (2012)