Spatial -

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: WGS84 epochs
Difference: WGS84 epochs PDF Print E-mail

Little shift

The first adjustment for the biggest adjustment for WGS-84

This is because the original WGS84 (1986) was not based on GPS.

Since then, shifts between epochs are minimal.