Transcription of 3 Geodesy, Datums, Map Projec- tions, and Coordinate Systems
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3 Geodesy, Datums, Map Projec- tions, and Coordinate Systems
853 Geodesy, Datums, Map Projec- tions, and Coordinate SystemsIntroductionGeographic information Systems are different from other information Systems because they contain spatial data. These spatial data include coordinates that define the location, shape, and extent of geo-graphic objects. To effectively use GIS, we must develop a clear understanding of how Coordinate Systems are established for the Earth, how these coordinates are measured on the Earth s curving surface, and how these coordinates are converted for use in flat maps, either digital or paper. This chap-ter introduces geodesy, the science of mea-suring the shape of the Earth, and map projections, the transformation of coordi-nate locations from the Earth s curved sur-face onto flat maps.
85 3 Geodesy, Datums, Map Projec- tions, and Coordinate Systems Introduction Geographic information systems are different from other information systems because they contain spatial data.
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