Transcription of 3 Geodesy, Datums, Map Projec- tions, and …
{{id}} {{{paragraph}}}
Example: confidence
3 Geodesy, Datums, Map Projec- tions, and …
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. Defining coordinates for the Earth s surface is complicated by three main fac-tors.
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.
Loading..
Tags:
Information
Domain:
Source:
Link to this page:
Please notify us if you found a problem with this document: