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Ch2 Sec3

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.

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Ch2 Sec3

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  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

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