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 Presentation from Joel Cusick, NPS : Datums and Transformations in GPS Software Presentation
Presentation from Joel Cusick, NPS : Datums and Transformations in GPS Software Presentation PDF Print E-mail

Of great interest - especially to ALASKA GPS and GIS users

Joel Cusick, NPS, Anchorage, AK: Projections and Datums Presentation Feb 2013

Click here to download 8.8 MB Presentation

There is much confusion on what datum is assumed and what datum transformations are used inside GPS processing software. This presentation addresses the confusion within the 3 main GPS enabled workflows in the National Park Service.

1. The reliable, trusted Garmin PND, usually the first location aware device on the scene.

2. The mapping grade submeter GPS suite. Represented by the Trimble mapping devices providing not only submeter solutions, but tieing mapping and surveying projects together in a common National Spatial Reference frame.

3. Lastly, the ArcPad software workflows, often found in a plane, or on an ATV providing instant GIS layer creation where ever you are.

We will explore shifters between WGS84 and NAD83 reference datums popular in the software today, and will hopefully guide you thru an often confusing, array of translators taking you back and forth.   As this title slide shows, we hope you won’t get run over by the GPS crew this summer who THINKS they are in one reference frame, while you as a GIS manager ASSUMES they are in another reference frame.

This confusion causes pain and suffering when metadata is not passed between the field and office.

UPDATE 2014 : You may also wish to view 

NGS Videos on Geodetic Datums!