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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 Tools
Datums Tips, Tricks & FAQ
Display # 
# Web Link
1   Link   NGS HTDP tranformation tool
Horizontal Time-Dependent Positioning (HTDP. This interactive NGS tool transforms positions between different epochs of ITRF, and between and epoch of ITRF and NAD83(CORS96).
2   Link   NGS NADCON tranformation tool
NADCON, this NGS tool transforms positions between NAD27, NAD83(1986), or NAD83(HARN). Note, it only works for horizontal positions and not elevation data.
3   Link   Geoid12 ggf files
Download from Trimble
4   Link   NAD83(2011) .prj file
Direct from ESRI
5   Link   Add Coordinate System or Geoid to PFO
Add CSD and GGF files to Trimble Pathfinder Office
6   Link   NGS INVERSE transformation tool
Inverse and Forward are transformation tools from NGS to move between datums.