Page 81 - 4670
P. 81

related to a central meridian and it does not retain the straight rhumb
                  line property of the Mercator projection.
                        The  Gauss-Kruger  projection  is  similar  to  the  Transverse
                  Mercator projection except that there is only one meridian that touches

                  the cylinder from the globe. In this case, the scale factor = 1 on the
                  touching meridian - the central meridian.
                        European  conical  projections  use  two  standard  parallels.  The

                  choice of the two standard parallels will usually be made according to
                  the latitudinal extent of the area that one wishes to map. The parallels
                  usually  chosen  this  way  lie  proportionally  inboard  of  the  north  and
                  south margins of the mapped area. The projections with two standard

                  parallels  normally  maintain  the  nominal  map  scale  along  the  two
                  parallels  of  latitudes  that  are  the  lines  of  intersection  between  the
                  imagined cone and the ellipsoid or sphere.

                        The following projections are commonly used to show Europe on
                  a map:
                        - Europe Lambert Conformal Conical projection maintains key

                  conformal  properties.  The  spacing  of  the  parallels  is  variable  and
                  increases with increasing distance from the standard parallel, while the
                  meridians  are  all  straight  lines  radiating  from  a  point  on  the

                  prolongation of the spheroid axis or ellipsoid's minor axis.
                        - Europe Albers Equal Area Conical projection maintains the
                  equivalent  properties  –  the  spacing  of  the  parallels  is  variable  and
                  decreases  with  increasing  distance  from  the  standard  parallel,  while

                  the  meridians  are  all  straight  lines  that  radiate  from  a  point  on  the
                  prolongation of the spheroid axis or ellipsoid's minor axis.
                        - Europe  Equidistant  Conical  projection  maintains  the

                  equidistant  property  only  along  all  meridians  and  along  one  or  two
                  standard  parallels.  Directions,  shapes  and  areas  are  reasonably
                  accurate,  but  distortion  increases  away  from  the  standard  parallels.
                  Maps that use this projection are not conformal or equal area, but a

                  compromise between the Lambert Conformal Conic and Albers Equal
                  Area Conic projections.


                        Task 3. Answer the questions to the text.

                        1. What types of map projection by shape of normal graticule do
                  you know?
                        2. What  are  the  main  characteristics  of  map  projection  by

                  distortion?

                                                              81
   76   77   78   79   80   81   82   83   84   85   86