Transcription of The Universal Transverse Mercator (UTM) Grid
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The Universal Transverse Mercator (UTM) Grid
Map ProjectionsThe most convenient way to identifypoints on the curved surface of the Earthis with a system of reference lines calledparallels of latitude and meridians of lon-gitude. On some maps, the meridians andparallels appear as straight lines. On mostmodern maps, however, the meridians andparallels appear as curved lines. Thesedifferences are due to the mathematicaltreatment required to portray a curvedsurface on a flat surface so that importantproperties of the map (such as distanceand areal accuracy) are shown with mini-mum distortion. The system used to por-tray a part of the round Earth on a flatsurface is called a map simplify the use of maps and to avoidthe inconvenience of pinpointing loca-tions on curved reference lines, cartogra-phers superimpose on the map a rectangu-lar grid consisting of two sets of straight,parallel lines, uniformly spaced, each setperpendicular to the other.
covering a strip 6° wide in longitude. These zones are numbered consecutively beginning with Zone 1, between 180° and 174° west longitude, and progressing east-ward to Zone 60, between 174° and 180° east longitude. Thus, the conterminous 48 States are covered by 10 zones, from Zone 10 on the west coast through Zone 19 in New England (fig. 1).
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