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     MAP(7)                      (bowell)                       MAP(7)

          map - draw maps on various projections

          map projection [ param ... ] [ option ... ]

          Map prepares on the standard output a map suitable for dis-
          play by any plotting filter described in plot(1). A menu of
          projections is produced in response to an unknown
          projection. For the meanings of params pertinent to particu-
          lar projections see map(3).

          The default data for map are world shorelines.  Option -f
          accesses more detailed data classified by feature.

          -f [ feature ] ...
               Known features are ranked 1 to 4 from major to minor,
               with a higher-numbered rank including all lower-
               numbered ones.  A missing rank is taken to be 1.  Fea-
               tures are
               shore[1-4]    seacoasts, lakes, and islands; option -f always shows shore1
               ilake[1-2]    intermittent lakes
               river[1-4]    rivers
               iriver[1-3]   intermittent rivers
               canal[1-3]    (canal3 = irrigation canals)
               country[123]  (country[23] = disputed and indefinite boundaries)
               state         states and provinces (US and Canada only)

          In the following list of other options all coordinates are
          in degrees, with north latitude and west longitude counted
          as positive.

          -l S N E W
               the southern and northern latitude and the eastern and
               western longitude limits of the desired map.  Missing
               arguments are filled out from the list -90, 90, -180,
               180, or lesser limits suitable to the projection in

          -o lat lon rot
               Orient the map in a nonstandard position.  Imagine a
               transparent gridded sphere around the globe.  First
               turn the overlay about the North Pole so that the Prime
               Meridian (longitude 0) of the overlay coincides with
               meridian lon on the globe.  Then tilt the North Pole of

     MAP(7)                      (bowell)                       MAP(7)

               the overlay along its Prime Meridian to latitude lat on
               the globe.  Finally again turn the overlay about its
               `North Pole' so that its Prime Meridian coincides with
               the previous position of meridian rot. Project the
               desired map in the standard form appropriate to the
               overlay, but presenting information from the underlying
               globe.  Missing arguments are filled out from the list
               90, 0, 0.  Default orientation is 90, 0, m, where m is
               the middle of the longitude range.

          -w S N E W
               Window the map by the specified latitudes and longi-
               tudes in the tilted, rotated coordinate system.  (It is
               wise to give an encompassing -l option with -w.  Other-
               wise for small windows computing time varies inversely
               with area!)

          -d n Alter the density of points by plotting only every nth

          -r   Reverse left and right side of map, for star charts and
               inside-out views.

          -s   Save the screen, don't erase before drawing.

          -g dlat dlon res
               Grid spacings are dlat, dlon (10 degrees by default).
               Zero spacing means no grid.  Missing dlat is taken to
               be zero.  Missing dlon is taken the same as dlat. Grid
               lines are drawn to a resolution of res (2 degrees by

          -p lat lon extent
               Position the point lat, lon at the center of the plot-
               ting area, and scale so that the height (and width) of
               the nominal plotting area is extent times the size of
               one degree of latitude at the center.  For example, a
               standard schoolroom-wall Mercator map comes out as if
               positioned and scaled with -p 0 0 360.

          -c x y
               After all other positioning and scaling operations have
               been performed, move the center of the map to position
               x, y, where the nominal plotting area is -1≦x≦1,

          -m [ file ] ...
               Use map data from named files instead of the defaults.
               If no files are named, plot grid only.  Names not the
               pathname of real files are looked up in a standard
               directory, which contains, in addition to the data for

     MAP(7)                      (bowell)                       MAP(7)

               world    World Data Bank I from CIA (the default map)
               states   US map from Census Bureau
               counties US map from Census Bureau

          -b   Suppress border around map.

          -t [ file ] ...
               The following arguments name ASCII files that contain
               lists of points, given as latitude-longitude pairs in
               degrees.  If the first file is named `-', the standard
               input is taken instead.  The points of each list are
               plotted as connected `tracks', i.e.  dot-dashed lines
               superimposed on the map.  A nonnumeric field optionally
               preceded by `"' ends a track.  The field together with
               everything up to the next newline is placed as a label
               at the last point of the track, positioned so that a
               leading character such as `+' or `X' will fall on the

          -u [ file ] ...
               Same as -t, except the tracks are unbroken lines.

          The environment variables MAP and MAPDIR change the default
          map and default directory.

          A `polar' map centered on New York (actually a low-orbit
          view): map perspective 1.025 -o 40.75 74.  The job can be
          done faster by limiting the map so as not to `plot' the
          invisible part of the world: map perspective 1.025 -o 40.75
          74 -l 20 60 30 100.
          An `equatorial' map of the earth centered on New York: map
          mercator -o 49.25 -106 180.  The pole of the map is placed
          90 degrees away on the other side of the earth.  A 180-
          degree twist around the pole of the map arranges that the
          `Prime Meridian' of the map runs from the pole of the map
          over the North Pole to New York instead of down the back
          side of the earth.  The same effect can be had from: map
          mercator -o 130.75 74.
          A customary curved-latitude map of the United States: map
          albers 28 45 -l 20 50 60 130.

          /n/bowell/usr1/maps default directory, contains following
          101,102,...,403     World Data Bank II
          world               World Data Bank I

          map(5), map(3), plot(1)

     MAP(7)                      (bowell)                       MAP(7)

          `map seems to be empty'-the intersection of the limits and
          the window seems to be null; for very local maps, the grid
          resolution res may have to be refined.

          Border lines appear only along boundaries that arise from -l
          and -w options.
          Segments that cross a map border are dropped.