Coordinate Systems. Global Coordinate System – Latitude, Longitude and elevation UTM – eastings and northings, reference points are the equator and the central meridians (60 of them for 60 zones) Extends from 84 ° N to 80 °S
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(Sometimes Clark 1880?)
Polygon Storage - Use Arcs(more common)
(Topologically Integrated Geographic Encoding and Referencing)