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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 GDB Basics What is a Geodatabase?
What is a Geodatabase? PDF Print E-mail

A geodatabase is a central storage location for features, related datasets and behaviors. GDBs are the standard GIS storage model of choice over the previous ESRI storage formats, the coverage and the shapefile.


The geodatabase has 2 major concepts

First

It is a relational database offers a seamless physical storage location that makes it easy to scale GIS datasets to extremely large sizes and numbers of users.  Tables provide the primary storage mechanism for geographic datasets, query and processing.

Second

Geodatabase elements are object-oriented and can extend simple tables, features, and rasters to add rich behavior, data integrity, and data management capabilities. The geodatabase schema includes the definitions, integrity rules, and behavior for each of these extended capabilities. These include properties for coordinate systems, coordinate resolution, feature classes, topologies, networks, raster catalogs, relationships, domains, and more.