> GIS and GPS

GIS: An Overview
A comprehensive overview of GIS, Geographic Information Systems, and how this incredible technology is utilized to make maps and analyze geographic data.

GPS
The eight most important things you need to know about the GPS - Global Positioning System. Learn about the satellites that orbit the earth and how, using a handheld receiver unit, the GPS works to help you determine your location, speed, elevation, and the exact time.

Landsat
An overview of the Landsat satellites which have been orbiting the earth for over a quarter of a century, from your About.com Guide to Geography.

Geodetic Datums
Geography Intern Amanda Briney provides us a fantastic overview of geodetic datums such as NAD 83 and WGS 84. Let Amanda's article tell you all about the datums, how they came about, and how they are used in mapping and in GPS.

An Introduction to GIS
Your Guide provides an overview of Geographic Information Systems (GIS) and how it works, using the fictional River City as they begin a GIS program.

GIS Lounge
GIS expert Guide Caitlin Dempsey covers the breadth and scope of GIS (Geographic Information Systems, computerized mapping) on this comprehensive site, which includes a forum for your GIS queries.