Lecture04

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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2 Data or service? • Initially, GIS users wanted raw data for use in GIS • Next came clearinghouses and web portals: facilitating search and discovery • Now the Internet offers web services – Solutions not data – But, queries can be tracked • What next? Finding Existing Map Data • Map libraries • Reference books • State and local agencies • Federal agencies • Commercial data suppliers e.g. Rand McNally, Thompson, maps.com • Teleatlas (TomTom), Navteq (Nokia)
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3 www.openstreetmap.org Sources Existing Map Data • Existing map data can be found through a map library, via network searches, or on media such as CD- ROM and disk • Data providers make their data available via the Web, a network of file servers available over the Internet • GIS vendors package data with products • Web portals, search engines, clearing houses Commercial vendors
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4 DeLorme: Eartha Even USCB Geography is in on the act
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This note was uploaded on 12/28/2011 for the course GEOG 176a taught by Professor Clarke during the Fall '09 term at UCSB.

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

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