We are providing links here to what we think are the best descriptions of various GIS technical terms and concepts.

If you are new to GIS, we recommend you start with the USGS GIS Tutorial

Or, follow our links to read more about the GIS concepts you are most interested in:

GIS Concepts:
• The Definition of a GIS
• Conceptualizing what a GIS is
• Components of a GIS
• What can a GIS do for you?
• GIS Analysis
• GIS Exercises/Quizzes
• GIS FAQ
• GIS Glossaries

GIS Data Concepts:
• GIS Data File Formats
• Data Accuracy and Precision
• Vector Data
• Raster Data
• Non-Spatial Attribute Data
• Metadata
• GIS Data Standards

GIS Mapping Concepts:
• Coordinate Systems
• Map Projections
• Map Scale
• Creating Good Maps