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 GDB Basics Geodatabase Concepts & Types
Geodatabase Concepts & Types PDF Print E-mail

The geodatabase has 2 major concepts

1 - 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.

2 - 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.

The personal GDB (pGDB) is the focus of this site

Since this site focuses on the use and advantages of GDBs for mobile computing and its for mobile commuting, we will focus on the personal geodatabase (pGDB).  This is because while ESRI ArcPad data collection software supports all types of GDBs,  Trimble GPS Analyst Extension , which is a common choice for processing GPS data, does not support the fGDB.

GDB Types

Type of geodatabase
Type of DBMS
Personal geodatabase MS Access
File geodatabase A file system folder containing data files
ArcSDE geodatabase licensed through ArcGIS Desktop (ArcEditor or ArcInfo) or through ArcGIS Server Workgroup Edition MS SQL Server 2005 Express Edition
ArcSDE geodatabase licensed through ArcGIS Server Enterprise Edition IBM DB2-Enterprise Server Edition
IBM Informix Dynamic Server-Workgroup or Enterprise Edition
Oracle-Standard One, Standard, or Enterprise Edition. Oracle  Spatial or Oracle Locator can be used as an option to store geometry, as can the ISO spatial type.
PostgreSQL 8.2.3
MS SQL Server-Workgroup, Standard, or Enterprise Edition