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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 Compare: ITRF, IGS08, WGS84 and NAD83
Compare: ITRF, IGS08, WGS84 and NAD83 PDF Print E-mail

For every reference system, specify the datum tag (also called frame tag), and epoch time

For example for the reference frame NAD83(2011) epoch 2010.00 these are –

Reference system: NAD83

Datum/frame tag: (2011), year adjustment completed

Epoch time: 2010.00, control station position at midnight Jan 1, 2010

While not specified, the antennae calibration value is attached to each particular reference frame and distinguishes these frames as well.


Reference frame definitions

·         ITRF frame (global): multi-technique (vlbi, slr, foris, gnss)

·         IGS frame (global): GNSS only

·         NAD83 frame (plate fixed): related to ITRF/IGS

   Frame name                                          Epoch                  Antennae PCV

   ITRF2000                                             1997.00                    Rel

   ITRF2000 (NGS)                                   1997.00                    Rel NGS

   NAD83(CORS96)                                  2002.00                     Rel NGS  

   NAD83(PacP00)                                    2002.00                     Rel NGS  

   NAD83(MarP00)                                    2002.00                     Rel NGS 

   IGS08                                                   2005.00                     Abs IGS08

    IGS08 (NGS)                                        2005.00                     Abs IGS08

   NAD83(2011)                                     2010.00                     Abs NGS

   NAD83(PA11)                                     2010.00                     Abs NGS

   NAD83(MA11)                                    2010.00                     Abs NGS

* Standard Antennae Calibration Value (phase center value - PCV)

   moved from Relative (Rel) to Absolute (Abs).

Source for above chart