Coordinate Systems & Projections

Basics

• Using Maps (from Wiley)
• Using Map Scales (from CUNY)
• How Globes Are Made (Chicago History Museum, YouTube video)
• Great Circle Distances (shortest distance between two points on a spherical surface)

Geoids (modelling the shape of the Earth)

• What is a Geoid?
• The Shape of Planet Earth
• The History of Geodesy
• What are NAD27 and NAD83?

Projections (putting a round object on a flat paper/screen)

• Map Projections (from USGS)
• Projections Illustrated (from ESRI)
• From Spherical Earth to Flat Map
• Picture Gallery of Map Projections
• Gallery of Map Projections
• Mean Sea Level, GPS, and the Geoid

Coordinate Systems (identifying location)

• How to Use a Geographic Grid (from Wiley)
• The World Coordinate Converter
• Latitude and Longitude (from WorldAtlas.com)
• Latitude and Longitude (from NASA)
• UTM Factsheet
• Using UTM Coordinates
• Metes & Bounds versus Public Land Survey System
• The Public Land Survey System (from NationalAtlas.gov)
• The Public Land Survey System (from Idaho State University)