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 GPS Basics

This section provides the needed facts to understand how GPS works and how to choose hardware, software and workflows appropriate to your project.

Since field conditions are not always ideal (ie. heavy tree canopy, tight canyons or poor satellite geometry)  GPS receiver settings may have to be adjusted to collect data.  These fundamentals will also help you adapt in these less than ideal settings, and anticipate the effects those changes will have on the accuracy of your data as it is collected in the field and processed in the office for inclusion in your GIS .  After all -

How can you be confident in the results if you don’t know fundamentally how a tool works?

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# Article Title
1 Where are You?
2 How Satellites Determine Location
3 Factors Affecting GPS Accuracy
4 Accuracy Defined
5 Differential Correction
6 Differential Correction Methods
7 ALWAYS Choose the Right Tool for the Job !
8 Trimble Mapping: Case Study