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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 Basics Difference: NAD83 epochs
Difference: NAD83 epochs PDF Print E-mail

Little shift

Shifts between epochs are minimal.

The following 2 images, courtesy of Michael Dennis, NGS show the difference between NAD 83(2011) epoch 2010.0 and NAD 83(CORS96) epoch 2002.0 in CONUS

Compare_NAD83_2011_and_CORS96_horizontal_change.

Compare_NAD83_2011_and_CORS96_vertical_change

Note: A new tool is being developed to move between epochs of NAD83

NGS and Richard Snay expect GeoCONN to be released in early 2013