NAME

       psbasemap - To plot PostScript basemaps


SYNOPSIS

       psbasemap  -Btickinfo  -Jparameters  -Rwest/east/south/north[r] [ -Eaz-
       imuth/elevation     ]     [     -Gfill     ]     [     -K      ]      [
       -L[f][x]lon0/lat0/slat/length[m|n|k]    ]   [   -O   ]   [   -P   ]   [
       -U[/dx/dy/][label] ] [ -V ] [ -Xx-shift ] [ -Yy-shift ] [ -Xy-level ] [
       -Zzlevel ] [ -ccopies ]


DESCRIPTION

       psbasemap creates PostScript code that will produce a basemap.  Several
       map projections are available, and the user may specify separate  tick-
       mark intervals for boundary annotation, ticking, and [optionally] grid-
       lines.  A simple map scale may also be plotted.
            No space between the option flag  and  the  associated  arguments.
       Use upper case for the option flags and lower case for modifiers.

       -B     Sets  map  boundary tickmark intervals. tickinfo is a textstring
              made up of one or  more  concatenated  substrings  of  the  form
              [which]tick[m|c].   The optional which can be either a for anno-
              tation interval [Default], f for frame tick interval, or  g  for
              gridline  interval.  If frame interval is not set, it is assumed
              to be the same as annotation interval. tick is the desired  tick
              interval.   The  optional  m|c  indicates minutes (m) or seconds
              (c).  To specify separate x and y ticks, separate the substrings
              that  apply  to  the  x  and  y  axes with a slash [/] (If a 3-D
              basemap is selected with -E, -Jz, a third  substring  pertaining
              to  the  vertical  axis  may be appended.)  For linear/log/power
              projections (-Jx): Labels for each axis can  be  added  by  sur-
              rounding  them with colons.  If the first character in the label
              is a period, then the label is used as plot title; if  it  is  a
              comma  then the label is appended to each anotation (start label
              with - to avoid space between anotation and unit);  else  it  is
              the  axis  label.   If the label consists of more than one word,
              enclose the entire label in double quotes (e.g., :"my  label":).
              By  default,  all 4 boundaries are plotted (referred to as W, E,
              S, N).  To change the default, append the code  for  only  those
              axes  you  want  (e.g., WS for standard lower-left x- and y-axis
              system).  Upper case (e.g., W)  means  draw  axis/tickmarks  AND
              annotate  it,  whereas  lower  case  (e.g.,  w)  will  only draw
              axis/tickmarks.  (If a 3-D basemap is selected with -E and  -Jz,
              append  Z  or  z to control the appearance of the vertical axis.
              Append '+' to draw the outline of the cube defined by -R.   Note
              that for 3-D views the title, if given, will be suppressed.)
              For  non-geographical  projections: Give negative scale (in -Jx)
              or axis length (in -JX) to change the  direction  of  increasing
              coordinates (i.e., to make the y-axis positive down).  For log10
              axes:  Annotations can be specified in one of three  ways:   (1)
              tick  can  be  1,  2,  or  3.  Annotations will then occur at 1,
              1-2-5, or 1-2-3-4-...-9, respectively.  This option can also  be
              used  for the frame and grid intervals.  (2) An l is appended to
              the tickinfo string.  Then, log10 of the tick value  is  plotted
              at  every integer log10 value.  (3) A p is appended to the tick-
              info string.  Then, annotations appear as 10 raised to log10  of
              the tick value.  For power axes: Annotations can be specified in
              one of two ways:  (1) tick sets the regular annotation interval.
              (2)  A  p is appended to the tickinfo string.  Then, the annota-
              tion interval is expected to be in transformed  units,  but  the
              annotation  value will be plotted as untransformed units.  E.g.,
              if tick = 1 and power = 0.5 (i.e., sqrt), then equidistant anno-
              tations labeled 1-4-9... will appear.
              These GMT parameters can affect the appearance of the map bound-
              ary:      ANOT_MIN_ANGLE,      ANOT_MIN_SPACING,      ANOT_FONT,
              ANOT_FONT_SIZE,  ANOT_OFFSET,  BASEMAP_AXES,  BASEMAP_FRAME_RGB,
              BASEMAP_TYPE,     DEGREE_FORMAT,     FRAME_PEN,     FRAME_WIDTH,
              GRID_CROSS_SIZE,    GRID_PEN,    HEADER_FON,   HEADER_FONT_SIZE,
              LABEL_FONT,   LABEL_FONT_SIZE,   LINE_STEP,   OBLIQUE_ANOTATION,
              TICK_LENGTH,  TICK_PEN, and Y_AXIS_TYPE; see the gmtdefaults man
              page for details.

       -J     Selects the map projection.  The following character  determines
              the  projection.   If the character is upper case then the argu-
              ment(s) supplied as scale(s) is interpreted to be the map  width
              (or  axis  lengths), else the scale argument(s) is the map scale
              (see its definition for each projection).  UNIT is cm, inch,  or
              m,  depending  on  the MEASURE_UNIT setting in .gmtdefaults, but
              this can be overridden on the command line by appending c, i, or
              m  to  the scale/width values.  Choose one of the following pro-
              jections (The E or C after projection names  stands  for  Equal-
              Area and Conformal, respectively):

              CYLINDRICAL PROJECTIONS:

              -Jclon0/lat0/scale or -JClon0/lat0/width (Cassini).
                   Give projection center and scale (1:xxxx or UNIT/degree).
              -Jjlon0/scale  or -JJlon0/width (Miller Cylindrical Projection).
                   Give  the   central   meridian   and   scale   (1:xxxx   or
              UNIT/degree).
              -Jmparameters (Mercator [C]).  Specify one of:
                   -Jmscale or -JMwidth
                        Give scale along equator (1:xxxx or UNIT/degree).
                   -Jmlon0/lat0/scale or -JMlon0/lat0/width
                        Give  central  meridian,  standard  latitude and scale
              along parallel (1:xxxx or UNIT/degree).
              -Joparameters (Oblique Mercator [C]).  Specify one of:
                   -Joalon0/lat0/azimuth/scale or -JOalon0/lat0/azimuth/width
                        Set projection center, azimuth of oblique equator, and
              scale.
                   -Joblon0/lat0/lon1/lat1/scale                            or
              -JOblon0/lat0/lon1/lat1/scale
                        Set projection center, another point  on  the  oblique
              equator, and scale.
                   -Joclon0/lat0/lonp/latp/scale                            or
              -JOclon0/lat0/lonp/latp/scale
                        Set projection center, pole of oblique projection, and
              scale.
                   Give scale along oblique equator (1:xxxx or UNIT/degree).
              -Jqlon0/scale  or -JQlon0/width (Equidistant Cylindrical Projec-
              tion (Plate Carree)).
                   Give  the   central   meridian   and   scale   (1:xxxx   or
              UNIT/degree).
              -Jtparameters (Transverse Mercator [C]).  Specify one of:
                   -Jtlon0/scale or -JTlon0/width
                        Give   the  central  meridian  and  scale  (1:xxxx  or
              UNIT/degree).
                   -Jtlon0/lat0/scale or -JTlon0/lat0/width
                        Give  projection   center   and   scale   (1:xxxx   or
              UNIT/degree).
              -Juzone/scale  or -JUzone/width (UTM - Universal Transverse Mer-
              cator [C]).
                   Give  the  zone  number  (1-60)  and   scale   (1:xxxx   or
              UNIT/degree).
                   zones: prepend - or + to enforce southern or northern hemi-
              sphere conventions [northern if south > 0].
              -Jylon0/lats/scale or -JYlon0/lats/width (Basic Cylindrical Pro-
              jections [E]).
                   Give  the  central  meridian,  standard parallel, and scale
              (1:xxxx or UNIT/degree).
                   The standard parallel is typically one of these (but can be
              any value):
                   45   - The Peters projection
                   37.4 - The Trystan Edwards projection
                   30   - The Behrman projection
                   0    - The Lambert projection

              AZIMUTHAL PROJECTIONS:

              -Jalon0/lat0/scale or -JAlon0/lat0/width (Lambert [E]).
                   lon0/lat0 specifies the projection center.
                   Give  scale  as  1:xxxx or radius/lat, where radius is dis-
              tance
                   in UNIT from origin to the oblique latitude lat.
              -Jelon0/lat0/scale or -JElon0/lat0/width (Equidistant).
                   lon0/lat0 specifies the projection center.
                   Give scale as 1:xxxx or radius/lat, where  radius  is  dis-
              tance
                   in UNIT from origin to the oblique latitude lat.
              -Jflon0/lat0/horizon/scale     or     -JFlon0/lat0/horizon/width
              (Gnomonic).
                   lon0/lat0 specifies the projection center.
                   horizon specifies the max distance from  projection  center
              (in degrees, < 90).
                   Give  scale  as  1:xxxx or radius/lat, where radius is dis-
              tance
                   in UNIT from origin to the oblique latitude lat.
              -Jglon0/lat0/scale or -JGlon0/lat0/width (Orthographic).
                   lon0/lat0 specifies the projection center.
                   Give scale as 1:xxxx or radius/lat, where  radius  is  dis-
              tance
                   in UNIT from origin to the oblique latitude lat.
              -Jslon0/lat0/scale  or -JSlon0/lat0/width (General Stereographic
              [C]).
                   lon0/lat0 specifies the projection center.
                   Give scale as 1:xxxx (true at pole) or slat/1:xxxx (true at
              standard parallel slat)
                   or  radius/lat  (radius  in UNIT from origin to the oblique
              latitude lat).

              CONIC PROJECTIONS:

              -Jblon0/lat0/lat1/lat2/scale   or   -JBlon0/lat0/lat1/lat2/width
              (Albers [E]).
                   Give  projection  center, two standard parallels, and scale
              (1:xxxx or UNIT/degree).
              -Jdlon0/lat0/lat1/lat2/scale   or   -JDlon0/lat0/lat1/lat2/width
              (Equidistant)
                   Give  projection  center, two standard parallels, and scale
              (1:xxxx or UNIT/degree).
              -Jllon0/lat0/lat1/lat2/scale   or   -JLlon0/lat0/lat1/lat2/width
              (Lambert [C])
                   Give  origin,  2  standard parallels, and scale along these
              (1:xxxx or UNIT/degree).

              MISCELLANEOUS PROJECTIONS:

              -Jhlon0/scale or -JHlon0/width (Hammer [E]).
                   Give the central meridian and scale along  equator  (1:xxxx
              or UNIT/degree).
              -Jilon0/scale or -JIlon0/width (Sinusoidal [E]).
                   Give  the  central meridian and scale along equator (1:xxxx
              or UNIT/degree).
              -Jk[f|s]lon0/scale or -JK[f|s]lon0/width (Eckert IV (f)  and  VI
              (s) [E]).
                   Give  the  central meridian and scale along equator (1:xxxx
              or UNIT/degree).
              -Jnlon0/scale or -JNlon0/width (Robinson).
                   Give the central meridian and scale along  equator  (1:xxxx
              or UNIT/degree).
              -Jrlon0/scale -JRlon0/width (Winkel Tripel).
                   Give  the  central meridian and scale along equator (1:xxxx
              or UNIT/degree).
              -Jvlon0/scale or -JVlon0/width (Van der Grinten).
                   Give the central meridian and scale along  equator  (1:xxxx
              or UNIT/degree).
              -Jwlon0/scale or -JWlon0/width (Mollweide [E]).
                   Give  the  central meridian and scale along equator (1:xxxx
              or UNIT/degree).

              NON-GEOGRAPHICAL PROJECTIONS:

              -Jp[a]scale[/origin] or -JP[a]width[/origin] (Linear  projection
              for polar (theta,r) coordinates, optionally insert a after -Jp [
              or -JP] for azimuths CW from North  instead  of  directions  CCW
              from  East  [default],  optionally  append /origin in degrees to
              indicate an angular offset [0]).
                   Give scale in UNIT/r-unit.
              -Jxx-scale[/y-scale] or -JXwidth[/height]
              scale [or width] can be any of the following 3 types:
                   -Jxscale       - Regular linear scaling.
                   -Jxscalel - Take log10 of values before scaling.
                   -Jxscaleppower - Raise values to power before scaling.
              Give x-scale in UNIT/x-unit and  y-scale  in  UNIT/y-unit.   (y-
              scale  =  x-scale  if  not  specified separately).  Use negative
              scale(s) to reverse the direction of an axis (e.g., to have y be
              positive down).

              Append  a  single  d  if  data  are  geographical coordinates in
              degrees.  Default axes lengths (see gmtdefaults) can be  invoked
              using -JXh (for landscape); -JXv (for portrait) will swap the x-
              and y-axes lengths.  The GMT default unit for this  installation
              is  UNIT.   However, you may change this by editing your .gmtde-
              faults file(s) (run gmtdefaults to create one if you don't  have
              it).
                   The ellipsoid used in the map projections is user-definable
              by editing the .gmtdefaults file in  your  home  directory.   13
              commonly used ellipsoids and a spheroid are currently supported,
              and users may also specify their own ellipsoid  parameters  (see
              man gmtdefaults for more details).  GMT default is WGS-84.  Sev-
              eral GMT parameters can affect the projection: ELLIPSOID, INTER-
              POLANT,  MAP_SCALE_FACTOR, and MEASURE_UNIT; see the gmtdefaults
              man page for details.

       -R     west, east, south, and north specify the Region of interest.  To
              specify boundaries in degrees and minutes [and seconds], use the
              dd:mm[:ss] format.  Append r if lower left and upper  right  map
              coordinates are given instead of wesn.


OPTIONS

       -E     Sets  the  viewpoint's  azimuth  and  elevation (for perspective
              view) [180/90]

       -G     Paint inside of basemap. [Default is no fill].

       -G     Set fill of positive wiggles. [Default  is  black]  Specify  the
              shade (0-255) or color (r/g/b), or -Gpdpi/pattern, where pattern
              gives the number of the built-in pattern (1-90) OR the name of a
              Sun  1-,  8-, or 24-bit raster file.  dpi sets the resolution of
              the image. For 1-bit rasters: use  -GP  for  inverse  video,  or
              append  :Fr/g/b[B[r/g/b]] to specify fore- and background colors
              (use r/g/b = - for transparency).  See GMT Cookbook &  Technical
              Reference Appendix E for information on individual patterns.

       -Jz    Sets the vertical scaling (for 3-D maps).  Same syntax as -Jx.

       -K     More  PostScript code will be appended later [Default terminates
              the plot system].

       -L     Draws a simple map scale centered  on  lon0/lat0.   Use  -Lx  to
              specify  x/y position iinstead.  Scale is calculated at latitude
              slat, length is in km [miles if m is appended; nautical miles if
              n  is  appended].   Use  -Lf  to get a "fancy" scale [Default is
              plain].

       -O     Selects Overlay plot mode [Default initializes a new  plot  sys-
              tem].

       -P     Selects  Portrait  plotting  mode [GMT Default is Landscape, see
              gmtdefaults to change this].

       -U     Draw Unix System time stamp on plot.  User may specify where the
              lower  left corner of the stamp should fall on the page relative
              to lower left corner of plot.  Optionally, append a label, or  c
              (which  will  plot  the  command  string.).   The GMT parameters
              UNIX_TIME and UNIX_TIME_POS can affect the appearance;  see  the
              gmtdefaults man page for details.

       -V     Selects verbose mode, which will send progress reports to stderr
              [Default runs "silently"].

       -X -Y  Shift origin of plot by (x-shift,y-shift).  Prepend a for  abso-
              lute coordinates; the default (r) will reset plot origin.

       -Z     For 3-D projections:  Sets the z-level of the basemap [0].

       -c     Specifies the number of plot copies. [Default is 1]


EXAMPLES

       The following section illustrates the use of the options by giving some
       examples for the available map projections.  Note  how  scales  may  be
       given in several different ways depending on the projection.  Also note
       the use of upper case letters to  specify  map  width  instead  of  map
       scale.



NON-GEOGRAPHICAL PROJECTIONS


Linear x-y plot

       To make a linear x/y frame with all axes, but with only left and bottom
       axes annotated, using xscale = yscale = 1.0, ticking every 1  unit  and
       annotating  every  2, and using xlabel = "Distance" and ylabel = "No of
       samples", try

       psbasemap -R0/9/0/5 -Jx1 -Bf1a2:Distance:/:"No of samples":WeSn >  lin-
       ear.ps


log-log plot

       To  make  a log-log frame with only the left and bottom axes, where the
       x-axis is 25 cm and annotated every 1-2-5 and the y-axis is 15  cm  and
       anotated every power of 10 but has tickmarks every 0.1, try

       psbasemap        -R1/10000/1e20/1e25       -JX25cl/15cl       -B2:Wave-
       length:/a1pf3:Power:WS > loglog.ps


power axes

       To design an axis system to be used for  a  depth-sqrt(age)  plot  with
       depth  positive  down,  ticked and annotated every 500m, and ages anno-
       tated at 1 my, 4 my, 9 my etc, try

       psbasemap -R0/100/0/5000 -Jx1p0.5/-0.001 -B1p:"Crustal age":/500:Depth:
       > power.ps


Polar (theta,r) plot

       For  a base map for use with polar coordinates, where the radius from 0
       to 1000 should correspond to 3 inch and with gridlines and ticks  every
       30 degrees and 100 units, try

       psbasemap -R0/360/0/1000 -JP6i -B30p/100 > polar.ps



CYLINDRICAL MAP PROJECTIONS


Cassini

       A 10-cm-wide basemap using the Cassini projection may be obtained by

       psbasemap -R20/50/20/35 -JC35/28/10c -P -B5g5:.Cassini: > cassini.ps


Mercator [conformal]

       A  Mercator map with scale 0.025 inch/degree along equator, and showing
       the length of 5000 km along the equator (centered on 1/1 inch), may  be
       plotted as

       psbasemap  -R90/180/-50/50 -Jm0.025i -B30g30:.Mercator: -Lx1i/1i/0/5000
       > mercator.ps


Miller

       A global Miller cylindrical map with scale 1:200,000,000, may be  plot-
       ted as

       psbasemap -R0/360/-90/90 -Jj1:200000000 -B30g30:.Miller: > miller.ps


Oblique Mercator [conformal]

       To  create  a  page-size  global oblique Mercator basemap for a pole at
       (90,30) with gridlines every 30 degrees, try

       psbasemap  -R0/360/-70/70 -Joc0/0/90/30/0.064cd -B30g30:."Oblique  Mer-
       cator": > oblmerc.ps


Transverse Mercator [conformal]

       A regular Transverse Mercator basemap for some region may look like

       psbasemap   -R69:30/71:45/-17/-15:15   -Jt70/1:1000000   -B15m:."Survey
       area": -P > transmerc.ps


Equidistant Cylindrical Projection

       This projection only needs the central meridian and  scale.   A  25  cm
       wide global basemap centered on the 130E meridian is made by

       psbasemap  -R-50/310/-90/90  -JQ130/25c -B30g30:."Equidistant Cylindri-
       cal": > cyl_eqdist.ps



Universal Transverse Mercator [conformal]

       To use this projection you must know the UTM zone number, which defines
       the central meridian.  A UTM basemap for Indo-China can be plotted as

       psbasemap -R95/5/108/20r -Ju46/1:10000000 -B3g3:.UTM: > utm.ps


Basic Cylindrical [equal-area]

       First  select  which of the cylindrical equal-area projections you want
       by deciding on the standard parallel.  Here  we  will  use  45  degrees
       which  gives  the Peters projection.  A 9 inch wide global basemap cen-
       tered on the Pacific is made by

       psbasemap -R0/360/-90/90 -JY180/45/9i -B30g30:.Peters: > peters.ps



CONIC MAP PROJECTIONS


Albers [equal-area]

       A basemap for middle Europe may be created by

       psbasemap  -R0/90/25/55  -Jb45/20/32/45/0.25c  -B10g10:."Albers  Equal-
       area": > albers.ps


Lambert [conformal]

       Another basemap for middle Europe may be created by

       psbasemap  -R0/90/25/55 -Jl45/20/32/45/0.1i -B10g10:."Lambert Conformal
       Conic": > lambertc.ps


Equidistant

       Yet another basemap of width 6 inch for middle Europe may be created by

       psbasemap  -R0/90/25/55 -JD45/20/32/45/6i -B10g10:."Equidistant conic":
       > econic.ps



AZIMUTHAL MAP PROJECTIONS


Lambert [equal-area]

       A 15-cm-wide global view of the world from the  vantage  point  -80/-30
       will give the following basemap:

       psbasemap    -R0/360-/-90/90   -JA-80/-30/15c   -B30g30/15g15:."Lambert
       Azimuthal": > lamberta.ps

       Follow the instructions for stereographic projection  if  you  want  to
       impose  rectangular boundaries on the azimuthal equal-area map but sub-
       stitute -Ja for -Js.


Equidistant

       A 15-cm-wide global map  in  which  distances  from  the  center  (here
       125/10) to any point is true can be obtained by:

       psbasemap -R0/360-/-90/90 -JE125/10/15c -B30g30/15g15:."Equidistant": >
       equi.ps


Gnomonic

       A view of the world from the vantage point -100/40 out to a horizon  of
       60 degrees from the center can be made using the Gnomonic projection:

       psbasemap -R0/360-/-90/90 -JF-100/40/60/6i -B30g30/15g15:."Gnomonic": >
       gnomonic.ps


Orthographic

       A global perspective (from infinite distance) view of  the  world  from
       the vantage point 125/10 will give the following 6-inch-wide basemap:

       psbasemap -R0/360-/-90/90 -JG125/10/6i -B30g30/15g15:."Orthographic": >
       ortho.ps


Stereographic [conformal]

       To make a Polar stereographic projection basemap with radius = 12 cm to
       -60  degree  latitude, with plot title "Salinity measurements", using 5
       degrees annotation/tick interval and 1 degree gridlines, try

       psbasemap -R-45/45/-90/-60 -Js0/-90/12c/-60  -B5g1:."Salinity  measure-
       ments": > stereo1.ps

       To  make a 12-cm-wide stereographic basemap for Australia from an arbi-
       trary view point (not the poles), and use a  rectangular  boundary,  we
       must  give  the  pole  for  the new projection and use the -R option to
       indicate the lower left and upper right corners (in lon/lat) that  will
       define  our rectangle.  We choose a pole at 130/-30 and use 100/-45 and
       160/-5 as our corners.  The command becomes

       psbasemap  -R100/-45/160/-5r   -JS130/-30/12c   -B30g30/15g15:."General
       Stereographic View": > stereo2.ps



MISCELLANEOUS MAP PROJECTIONS


Hammer [equal-aera]

       The  Hammer  projection  is  mostly  used  for global maps and thus the
       spherical form is used.  To get a world map centered on Greenwich at  a
       scale of 1:200000000, try

       psbasemap  -R0/360/-90/90  -Jh180/1:200000000  -B30g30/15g15:.Hammer: >
       hammer.ps


Sinusoidal [equal-aera]

       To make a sinusiodal world map centered  on  Greenwich,  with  a  scale
       along the equator of 0.02 inch/degree, try

       psbasemap   -R0/360/-90/90  -Ji0/0.02i  -B30g30/15g15:."Sinusoidal":  >
       sinus1.ps

       To make an interrupted sinusiodal world map with breaks at  160W,  20W,
       and  60E,  with  a scale along the equator of 0.02 inch/degree, try the
       following sequence of commands:

       psbasemap  -R-160/-20/-90/90  -Ji-90/0.02i   -B30g30/15g15Wesn   -K   >
       sinus_i.ps
       psbasemap -R-20/60/-90/90 -Ji20/0.02i -B30g30/15g15wesn -O -K -X2.8i >>
       sinus_i.ps
       psbasemap -R60/200/-90/90 -Ji130/0.02i -B30g30/15g15wEsn -O  -X1.6i  >>
       sinus_i.ps


Eckert IV [equal-aera]

       Pseudo-cylindrical projection typically used for global maps only.  Set
       the central longitude and scale, e.g.,

       psbasemap -R0/360/-90/90 -Jkf180/0.064c -B30g30/15g15:."Eckert  IV":  >
       eckert4.ps


Eckert VI [equal-aera]

       Another  pseudo-cylindrical  projection  typically used for global maps
       only.  Set the central longitude and scale, e.g.,

       psbasemap -R0/360/-90/90 -Jks180/0.064c -B30g30/15g15:."Eckert  VI":  >
       eckert6.ps


Robinson

       Projection  designed to make global maps "look right".  Set the central
       longitude and width, e.g.,

       psbasemap -R-180/180/-90/90 -JN0/8i -B30g30/15g15:."Robinson": > robin-
       son.ps


Winkel Tripel

       Yet  another  projection  typically used for global maps only.  You can
       set the central longitude, e.g.,

       psbasemap -R90/450/-90/90 -JR270/25c -B30g30/15g15:."Winkel Tripel":  >
       winkel.ps


Mollweide [equal-aera]

       The  Mollweide  projection is also mostly used for global maps and thus
       the spherical form is used.  To get a 25-cm-wide world map centered  on
       the Dateline, try

       psbasemap  -R0/360/-90/90  -JW180/25c -B30g30/15g15:.Mollweide: > moll-
       weide.ps


Van der Grinten

       The Van der Grinten projection is also mostly used for global maps  and
       thus  the spherical form is used.  To get a 10-inch-wide world map cen-
       tered on the Dateline, try

       psbasemap -R0/360/-90/90 -JV180/10i -B30g30/15g15:."Van der Grinten": >
       grinten.ps


RESTRICTIONS

       For some projections, a spherical earth is implicitly assumed.  A warn-
       ing will notify the user if -V is set.


BUGS

       The -B option is somewhat complicated to explain and comprehend.   How-
       ever, it is fairly simple for most applications (see examples).


SEE ALSO

       gmtdefaults(l), gmt(l)



VERSION                              DATE                         PSBASEMAP(l)

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