Ch2 Sec3 Maps and Computers.

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Presentation transcript:

Ch2 Sec3 Maps and Computers

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

Key Terms Surveying Digitizing Satellite image Pixel Global Positioning System

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

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