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Transverse  Mercator  Projection - CONTINUED
Universal Transverse Mercator Military Grid - CONTINUED - 14071_190

Engineering Aid 2 - Intermediate Structural engineering guide book
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meridians as does the track of a vessel under a true course.  On  the  globe  the  parallels  become  shorter toward  the  poles,  and  their  length  is  proportionate  to the cosine of latitude. In the Mercator projection the parallels are equally long. This means that any parallel is increased by 1/cos q, or sec q, where q is  the  latitude in degrees. To have the same scale along the parallels as along the meridians, you must increase each degree of latitude by the secant of the latitude. In this math- ematical  transformation,  the  tangent  cylinder  concept was  not  employed,  nor  is  it  ever  employed,  in  the Mercator  projection.  A  Mercator  projection  table  is used to plot the meridional distances. For intensive study on elements of map projection, you may refer to special publications published by the U.S. Coast and Geodetic  Survey  that  deal  with  this  subject. Universal Transverse Mercator Military Grid An   extensive   application   of   the   transverse Mercator projection is in a grid reference system for military  maps  called  the  universal   transverse Mercator  (UTM)  military  grid  system.  In  this system a reference plane grid, like those used in our state  grid  systems,  is  imposed  on  transverse  Mercator projections  of  relatively  small  areas.  The  basic Figure 9-14.—(A) Grid zone designations of the military grid reference system; (B) 100,000-meter-square designations in the UTM military grid system, 9-13







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