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Lecture04 - Getting the Map into the Computer Getting the...

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1 Getting the Map into the Computer Getting Started with Geographic Information Systems Chapter 4 Getting the Map into the Computer 4.1 Analog-to-Digital Maps 4.2 Finding Existing Map Data 4.3 Digitizing and Scanning 4.4 Field and Image Data 4.5 Data Entry 4.6 Editing and Validation GIS maps are digital not analog Maps have a communications function but... A map has a storage function for spatial data Somehow, the visually “stored” data must get digital Real and Virtual maps 1100010101110100111 GIS Data Conversion Traditionally most of the cost of a GIS project One time cost Depends on reuse Requires maintenance Often done a whole collection at a time
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