1. Ch2 Sec3
Maps and Computers

2. Key Concepts
How does computer mapping differ from earlier ways of making maps?
What sources of data are used in making computer maps?

3. Key Terms Surveying Digitizing Satellite image Pixel
Global Positioning System

4. Ch2 Sec3
Surveying: mapmakers determine distances and elevations using instruments and the principles of geometry
With computers, mapmakers can store, process, and display map data electronically
Digitizing: the process by which mapmakers convert the location of map points to numbers

5. Ch2 Sec3
Computers produce maps using data from many sources, including satellites and the Global Positioning System
Satellite images: pictures of the surface based on data
Pixels: a satellite is made up of thousands of tiny dots
GPS: is a method of finding latitude, longitude, and elevation of points on Earth’s surface using a network of satellites