1PSBASEMAP(1)                          GMT                         PSBASEMAP(1)
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3
4

NAME

6       psbasemap - Plot PostScript base maps
7

SYNOPSIS

9       psbasemap  -Jparameters
10        -Rwest/east/south/north[/zmin/zmax][+r]   [    -B[p|s]parameters  ]  [
11       -A[file] ] [  -Dinsert box ] [  -Fbox ] [  -K ] [  -Jz|Zparameters ]  [
12       -Lscalebar ] [  -O ] [  -P ] [  -U[stamp] ] [  -Trose ] [  -Tmag_rose ]
13       [  -V[level] ] [  -Xx_offset ] [  -Yy_offset ] [ -fflags ] [ -pflags  ]
14       [ -ttransp ]
15
16       Note:  No  space  is allowed between the option flag and the associated
17       arguments.
18

DESCRIPTION

20       psbasemap creates PostScript code that will produce a basemap.  Several
21       map  projections  are  available,  and  the  user  may specify separate
22       tick-mark intervals for boundary annotation, ticking, and  [optionally]
23       gridlines.  A simple map scale or directional rose may also be plotted.
24       At least one of the options -B, -L, or -T must be specified.
25

REQUIRED ARGUMENTS

27       -Jparameters (more ...)
28              Select map projection.
29
30       -Rxmin/xmax/ymin/ymax[+r][+uunit] (more ...)
31              Specify the region of interest.
32
33       For perspective view p, optionally append /zmin/zmax. (more ...)
34

OPTIONAL ARGUMENTS

36       -A[file]
37              No plotting is performed.  Instead, we determine the  geographi‐
38              cal  coordinates  of  the  polygon  outline  for  the  (possibly
39              oblique) rectangular map domain.  The plot domain must be  given
40              via  -R  and  -J,  with  no  other options allowed. The sampling
41              interval is controlled via MAP_LINE_STEP parameter. The  coordi‐
42              nates  are  written  to file or to standard output if no file is
43              specified.
44
45       -B[p|s]parameters (more ...)
46              Set map boundary frame and axes attributes.
47
48       -D[unit]xmin/xmax/ymin/ymax[r][+sfile][+t]     |      -D[g|j|J|n|x]ref‐
49       point+wwidth[/height][+jjustify][+odx[/dy]][+sfile][+t]
50              Draw  a simple map insert box on the map.  Requires -F.  Specify
51              the box in one of three ways: (a) Give west/east/south/north  of
52              geographic  rectangle bounded by parallels and meridians; append
53              r if the coordinates instead are the lower left and upper  right
54              corners  of the desired rectangle. (b) Give uxmin/xmax/ymin/ymax
55              of bounding rectangle in projected coordinates (here, u  is  the
56              coordinate  unit).   (c) Give the reference point on the map for
57              the insert using one of four coordinate systems: (1) Use -Dg for
58              map  (user) coordinates, (2) use -Dj or -DJ for setting refpoint
59              via a 2-char justification code that refers to  the  (invisible)
60              map  domain  rectangle, (3) use -Dn for normalized (0-1) coordi‐
61              nates, or (4) use -Dx for plot coordinates (inches,  cm,  etc.).
62              Append  +wwidth[/height]  of  bounding  rectangle or box in plot
63              coordinates (inches, cm, etc.).  By default, the anchor point on
64              the scale is assumed to be the bottom left corner (BL), but this
65              can be changed by appending +j followed by a  2-char  justifica‐
66              tion  code justify (see pstext).  Note: If -Dj is used then jus‐
67              tify defaults to the same as refpoint, if -DJ is used then  jus‐
68              tify  defaults  to  the  mirror opposite of refpoint.  Add +o to
69              offset the inset fig by dx/dy away from the  refpoint  point  in
70              the  direction  implied  by justify (or the direction implied by
71              -Dj or -DJ).  If you need access to the placement of  the  lower
72              left  corner of the map insert and its dimensions in the current
73              map unit, use +sfile to write this information to file.   Alter‐
74              natively,  you may append +t to translate the plot origin to the
75              lower left  corner  of  the  map  insert.   Specify  insert  box
76              attributes via the -F option [outline only].
77
78       -F[d|l|t][+cclear‐
79       ances][+gfill][+i[[gap/]pen]][+p[pen]][+r[radius]][+s[[dx/dy/][shade]]]
80              Without further options, draws a rectangular border  around  any
81              map  insert  (-D),  map  scale  (-L)  or  map  rose  (-T)  using
82              MAP_FRAME_PEN; specify a different pen with +ppen.   Add  +gfill
83              to fill the logo box [no fill].  Append +cclearance where clear‐
84              ance is either  gap,  xgap/ygap,  or  lgap/rgap/bgap/tgap  where
85              these  items  are  uniform,  separate  in x- and y-direction, or
86              individual side spacings between logo and border.  Append +i  to
87              draw  a  secondary,  inner  border as well. We use a uniform gap
88              between borders of 2p and the MAP_DEFAULT_PEN unless other  val‐
89              ues are specified. Append +r to draw rounded rectangular borders
90              instead, with a 6p corner radius. You can override  this  radius
91              by appending another value. Finally, append +s to draw an offset
92              background shaded region. Here, dx/dy indicates the shift  rela‐
93              tive  to  the  foreground frame [4p/-4p] and shade sets the fill
94              style to use for shading [gray50].  Used in combination with -D,
95              -L  or  -T.  To  specify separate parameters for the various map
96              features, append  d|l|t to -F to specify  panel  parameters  for
97              just  that panel [Default uses the same panel parameters for all
98              selected map features].
99
100       -Jz|Zparameters (more ...)
101              Set z-axis scaling; same syntax as -Jx.
102
103       -K (more ...)
104              Do not finalize the PostScript plot.
105
106       -L[g|j|J|n|x]ref‐
107       point+c[slon/]slat+wlength[e|f|k|M|n|u][+aalign][+f][+jjus‐
108       tify][+l[label]][+odx[/dy]][+u]
109              Draws a simple map scale centered on the reference point  speci‐
110              fied  using  one of four coordinate systems: (1) Use -Lg for map
111              (user) coordinates, (2) use -Lj or -LJ for setting refpoint  via
112              a  2-char  justification code that refers to the (invisible) map
113              domain rectangle, (3) use -Ln for normalized (0-1)  coordinates,
114              or  (4)  use -Lx for plot coordinates (inches, cm, etc.).  Scale
115              is calculated for latitude  slat  (optionally  supply  longitude
116              slon  for  oblique  projections  [Default is central meridian]),
117              length is in km, or append unit from  e|f|k|M|n|u.   Change  the
118              label  alignment  with  +aalign  (choose  among l(eft), r(ight),
119              t(op), and b(ottom)).  Append +f to get a "fancy" scale [Default
120              is  plain].   By  default,  the anchor point on the map scale is
121              assumed to be the center of the scale  (MC),  but  this  can  be
122              changed  by appending +j followed by a 2-char justification code
123              justify (see pstext for list and explanation of codes).   Append
124              +l  to  select the default label, which equals the distance unit
125              (meter, foot, km, mile, nautical mile, US survey  foot)  and  is
126              justified  on  top  of the scale [t]. Change this by giving your
127              own label (append +llabel).  Add +o to offset the map  scale  by
128              dx/dy away from the refpoint in the direction implied by justify
129              (or the direction implied by -Dj or -DJ).  Select +u  to  append
130              the  unit  to  all distance annotations along the scale (for the
131              plain scale, +u will instead select the unit to be  appended  to
132              the  distance  length). Note: Use FONT_LABEL to change the label
133              font and FONT_ANNOT_PRIMARY to change the annotation font.   The
134              height  of  the map scale is controlled by MAP_SCALE_HEIGHT, and
135              the pen thickness is set by MAP_TICK_PEN_PRIMARY.  See -F on how
136              to place a panel behind the scale.
137
138       -O (more ...)
139              Append to existing PostScript plot.
140
141       -P (more ...)
142              Select "Portrait" plot orientation.
143
144       -Td[g|j|J|n|x]refpoint+wwidth[+f[level]][+jjus‐
145       tify][+lw,e,s,n][+odx[/dy]]
146              -Td draws a map directional rose on  the  map  at  the  location
147              defined  by  the reference and anchor points: Give the reference
148              point on the map for the rose using one of four coordinate  sys‐
149              tems:  (1)  Use g for map (user) coordinates, (2) use j for set‐
150              ting refpoint via a 2-char justification code that refers to the
151              (invisible) map domain rectangle, (3) use n for normalized (0-1)
152              coordinates, or (4) use x  for  plot  coordinates  (inches,  cm,
153              etc.) [Default].  You can offset the reference point by dx/dy in
154              the direction implied by justify.  By default, the anchor  point
155              on  the  scale is assumed to be the center of the rose (MC), but
156              this can be changed by appending +j followed by a 2-char  justi‐
157              fication  code  justify  (see pstext for list and explanation of
158              codes).  Note: If -Dj is used then justify defaults to the  same
159              as  refpoint, if -DJ is used then justify defaults to the mirror
160              opposite of refpoint.  Add +o to offset the color scale by dx/dy
161              away  from  the refpoint in the direction implied by justify (or
162              the direction implied by -Dj or -DJ).  Append +wwidth to set the
163              width  of  the  rose  in  plot  coordinates  (in  inches, cm, or
164              points).  Add +f to get a "fancy" rose,  and  specify  in  level
165              what  you  want  drawn.  The default [1] draws the two principal
166              E-W, N-S orientations, 2 adds the  two  intermediate  NW-SE  and
167              NE-SW  orientations,  while  3 adds the eight minor orientations
168              WNW-ESE, NNW-SSE, NNE-SSW,  and  ENE-WSW.   Label  the  cardinal
169              points W,E,S,N by adding +l and append your own four comma-sepa‐
170              rated strings to override the default.  Skip a specific label by
171              leaving  it  blank.   See Placing-dir-map-roses and -F on how to
172              place a panel behind the scale.
173
174       -Tm[g|j|J|n|x]refpoint+wwidth[+ddec[/dlabel]]][+ipen][+jjus‐
175       tify][+lw,e,s,n][+ppen][+tints][+odx[/dy]]
176          -Tm  draws a map magnetic rose on the map at the location defined by
177          the reference and anchor points: Give the reference point on the map
178          for the rose using one of four coordinate systems: (1) Use g for map
179          (user) coordinates, (2) use j for setting refpoint via a 2-char jus‐
180          tification code that refers to the (invisible) map domain rectangle,
181          (3) use n for normalized (0-1) coordinates, or (4) use  x  for  plot
182          coordinates  (inches, cm, etc.) [Default]. You can offset the refer‐
183          ence point by  dx/dy  in  the  direction  implied  by  justify.   By
184          default,  the  anchor point on the scale is assumed to be the center
185          of the rose (MC), but this can be changed by appending  +j  followed
186          by  a  2-char  justification  code  justify (see pstext for list and
187          explanation of codes).  Note: If -Dj is used then  justify  defaults
188          to the same as refpoint, if -DJ is used then justify defaults to the
189          mirror opposite of refpoint.  Add +o to offset the  color  scale  by
190          dx/dy away from the refpoint in the direction implied by justify (or
191          the direction implied by -Dj or -DJ).  Append  +wwidth  to  set  the
192          width  of  the  rose in plot coordinates (in inches, cm, or points).
193          Use +d to assign the magnetic declination and set dlabel, which is a
194          label for the magnetic compass needle (Leave empty to format a label
195          from dec, or give - to bypass labeling). With +d, both directions to
196          geographic  and  magnetic  north  are plotted [Default is geographic
197          only]. If the north label is * then a north star is plotted  instead
198          of  the north label. Annotation and two levels of tick intervals for
199          both geographic and magnetic directions default to  30/5/1  degrees;
200          override   these  settings  by  appending  +tints,  and  append  six
201          slash-separated intervals to set both the geographic  (first  three)
202          and  magnetic  (last  three)  intervals.   Label the cardinal points
203          W,E,S,N by adding  +l  and  append  your  own  four  comma-separated
204          strings  to  override the default.  Skip a specific label by leaving
205          it blank.  Number GMT default parameters control  pens,  fonts,  and
206          color.   See  Placing-dir-map-roses  and  -F on how to place a panel
207          behind the scale.
208
209       -U[[just]/dx/dy/][c|label] (more ...)
210              Draw GMT time stamp logo on plot.
211
212       -V[level] (more ...)
213              Select verbosity level [c].
214
215       -X[a|c|f|r][x-shift[u]]
216
217       -Y[a|c|f|r][y-shift[u]] (more ...)
218              Shift plot origin.
219
220       -f[i|o]colinfo (more ...)
221              Specify data types of input and/or output columns. This  applies
222              only to the coordinates specified in the -R option.
223
224       -p[x|y|z]azim[/elev[/zlevel]][+wlon0/lat0[/z0]][+vx0/y0] (more ...)
225              Select perspective view.
226
227       -t[transp] (more ...)
228              Set PDF transparency level in percent.
229
230       -^ or just -
231              Print  a  short  message  about  the syntax of the command, then
232              exits (NOTE: on Windows just use -).
233
234       -+ or just +
235              Print an extensive usage (help) message, including the  explana‐
236              tion  of  any  module-specific  option  (but  not the GMT common
237              options), then exits.
238
239       -? or no arguments
240              Print a complete usage (help) message, including the explanation
241              of all options, then exits.
242

EXAMPLES

244       The following section illustrates the use of the options by giving some
245       examples for the available map projections.  Note  how  scales  may  be
246       given  in several different ways depending on the projection. Also note
247       the use of upper case letters to  specify  map  width  instead  of  map
248       scale.
249

NON-GEOGRAPHICAL PROJECTIONS

251   Linear x-y plot
252       To make a linear x/y frame with all axes, but with only left and bottom
253       axes annotated, using xscale = yscale = 1.0, ticking every 1  unit  and
254       annotating  every  2, and using xlabel = "Distance" and ylabel = "No of
255       samples", use
256
257              gmt psbasemap -R0/9/0/5 -Jx1 -Bf1a2 -Bx+lDistance -By+l"No of samples" -BWeSn > linear.ps
258
259   Log-log plot
260       To make a log-log frame with only the left and bottom axes,  where  the
261       x-axis  is  25 cm and annotated every 1-2-5 and the y-axis is 15 cm and
262       annotated every power of 10 but has tick-marks every 0.1, run
263
264              gmt psbasemap -R1/10000/1e20/1e25 -JX25cl/15cl -Bx2+lWavelength -Bya1pf3+lPower -BWS > loglog.ps
265
266   Power axes
267       To design an axis system to be used for  a  depth-sqrt(age)  plot  with
268       depth  positive  down,  ticked and annotated every 500m, and ages anno‐
269       tated at 1 my, 4 my, 9 my etc, use
270
271              gmt psbasemap -R0/100/0/5000 -Jx1p0.5/-0.001 -Bx1p+l"Crustal age" -By500+lDepth > power.ps
272
273   Polar (theta,r) plot
274       For a base map for use with polar coordinates, where the radius from  0
275       to 1000 should correspond to 3 inch and with gridlines and ticks inter‐
276       vals automatically determined, use
277
278              gmt psbasemap -R0/360/0/1000 -JP6i -Bafg > polar.ps
279

CYLINDRICAL MAP PROJECTIONS

281   Cassini
282       A 10-cm-wide basemap using the Cassini projection may be obtained by
283
284              gmt psbasemap -R20/50/20/35 -JC35/28/10c -P -Bafg -B+tCassini > cassini.ps
285
286   Mercator [conformal]
287       A Mercator map with scale 0.025 inch/degree along equator, and  showing
288       the  length of 5000 km along the equator (centered on 1/1 inch), may be
289       plotted as
290
291              gmt psbasemap -R90/180/-50/50 -Jm0.025i -Bafg -B+tMercator -Lx1i/1i+c0+w5000k > mercator.ps
292
293   Miller
294       A global Miller cylindrical map with scale 1:200,000,000 may be plotted
295       as
296
297              gmt psbasemap -Rg -Jj180/1:200000000 -Bafg -B+tMiller > miller.ps
298
299   Oblique Mercator [conformal]
300       To  create  a  page-size  global oblique Mercator basemap for a pole at
301       (90,30) with gridlines every 30 degrees, run
302
303              gmt psbasemap -R0/360/-70/70 -Joc0/0/90/30/0.064cd -B30g30 -B+t"Oblique Mercator" > oblmerc.ps
304
305   Transverse Mercator [conformal]
306       A regular Transverse Mercator basemap for some region may look like
307
308              gmt psbasemap -R69:30/71:45/-17/-15:15 -Jt70/1:1000000 -Bafg -B+t"Survey area" -P > transmerc.ps
309
310   Equidistant Cylindrical Projection
311       This projection only needs the central meridian and scale. A 25 cm wide
312       global basemap centered on the 130E meridian is made by
313
314              gmt psbasemap -R-50/310/-90/90 -JQ130/25c -Bafg -B+t"Equidistant Cylindrical" > cyl_eqdist.ps
315
316   Universal Transverse Mercator [conformal]
317       To use this projection you must know the UTM zone number, which defines
318       the central meridian. A UTM basemap for Indo-China can be plotted as
319
320              gmt psbasemap -R95/5/108/20r -Ju46/1:10000000 -Bafg -B+tUTM > utm.ps
321
322   Cylindrical Equal-Area
323       First select which of the cylindrical equal-area projections  you  want
324       by deciding on the standard parallel. Here we will use 45 degrees which
325       gives the Gall projection. A 9 inch wide global basemap centered on the
326       Pacific is made by
327
328              gmt psbasemap -Rg -JY180/45/9i -Bafg -B+tGall > gall.ps
329

CONIC MAP PROJECTIONS

331   Albers [equal-area]
332       A basemap for middle Europe may be created by
333
334              gmt psbasemap -R0/90/25/55 -Jb45/20/32/45/0.25c -Bafg -B+t"Albers Equal-area" > albers.ps
335
336   Lambert [conformal]
337       Another basemap for middle Europe may be created by
338
339              gmt psbasemap -R0/90/25/55 -Jl45/20/32/45/0.1i -Bafg -B+t"Lambert Conformal Conic" > lambertc.ps
340
341   Equidistant
342       Yet another basemap of width 6 inch for middle Europe may be created by
343
344              gmt psbasemap -R0/90/25/55 -JD45/20/32/45/6i -Bafg -B+t"Equidistant conic" > econic.ps
345
346   Polyconic
347       A basemap for north America may be created by
348
349              gmt psbasemap -R-180/-20/0/90 -JPoly/4i -Bafg -B+tPolyconic > polyconic.ps
350

AZIMUTHAL MAP PROJECTIONS

352   Lambert [equal-area]
353       A  15-cm-wide  global  view of the world from the vantage point -80/-30
354       will give the following basemap:
355
356              gmt psbasemap -Rg -JA-80/-30/15c -Bafg -B+t"Lambert Azimuthal" > lamberta.ps
357
358       Follow the instructions for stereographic projection  if  you  want  to
359       impose  rectangular boundaries on the azimuthal equal-area map but sub‐
360       stitute -Ja for -Js.
361
362   Equidistant
363       A 15-cm-wide global map  in  which  distances  from  the  center  (here
364       125/10) to any point is true can be obtained by:
365
366              gmt psbasemap -Rg -JE125/10/15c -Bafg -B+tEquidistant > equi.ps
367
368   Gnomonic
369       A  view of the world from the vantage point -100/40 out to a horizon of
370       60 degrees from the center can be made using the Gnomonic projection:
371
372              gmt psbasemap -Rg -JF-100/40/60/6i -Bafg -B+tGnomonic > gnomonic.ps
373
374   Orthographic
375       A global perspective (from infinite distance) view of  the  world  from
376       the vantage point 125/10 will give the following 6-inch-wide basemap:
377
378              gmt psbasemap -Rg -JG125/10/6i -Bafg -B+tOrthographic > ortho.ps
379
380   General Perspective
381       The -JG option can be used in a more generalized form, specifying alti‐
382       tude above the surface, width and height of the view point,  and  twist
383       and  tilt.  A  view  from  160  km above -74/41.5 with a tilt of 55 and
384       azimuth of 210 degrees, and limiting the viewpoint to 30 degrees  width
385       and height will product a 6-inch-wide basemap:
386
387              gmt psbasemap -Rg -JG-74/41.5/160/210/55/30/30/6i -Bafg -B+t"General Perspective" > genper.ps
388
389   Stereographic [conformal]
390       To make a polar stereographic projection basemap with radius = 12 cm to
391       -60 degree latitude, with plot title "Salinity measurements",  using  5
392       degrees annotation/tick interval and 1 degree gridlines, run
393
394              gmt psbasemap -R-45/45/-90/-60 -Js0/-90/12c/-60 -B5g1 -B+t"Salinity measurements" > stereo1.ps
395
396       To  make a 12-cm-wide stereographic basemap for Australia from an arbi‐
397       trary view point (not the poles), and use a  rectangular  boundary,  we
398       must  give  the  pole  for  the new projection and use the -R option to
399       indicate the lower left and upper right corners (in lon/lat) that  will
400       define  our  rectangle. We choose a pole at 130/-30 and use 100/-45 and
401       160/-5 as our corners. The command becomes
402
403              gmt psbasemap -R100/-45/160/-5r -JS130/-30/12c -Bafg -B+t"General Stereographic View" > stereo2.ps
404

MISCELLANEOUS MAP PROJECTIONS

406   Hammer [equal-area]
407       The Hammer projection is mostly used  for  global  maps  and  thus  the
408       spherical  form  is used. To get a world map centered on Greenwich at a
409       scale of 1:200000000, use
410
411              gmt psbasemap -Rd -Jh0/1:200000000 -Bafg -B+tHammer > hammer.ps
412
413   Sinusoidal [equal-area]
414       To make a sinusoidal world map centered  on  Greenwich,  with  a  scale
415       along the equator of 0.02 inch/degree, use
416
417              gmt psbasemap -Rd -Ji0/0.02i -Bafg -B+tSinusoidal > sinus1.ps
418
419       To  make  an interrupted sinusoidal world map with breaks at 160W, 20W,
420       and 60E, with a scale along the equator of 0.02  inch/degree,  run  the
421       following sequence of commands:
422
423              gmt psbasemap -R-160/-20/-90/90 -Ji-90/0.02i -Bx30g30 -By15g15 -BWesn -K > sinus_i.ps
424              gmt psbasemap -R-20/60/-90/90 -Ji20/0.02i -Bx30g30 -By15g15 -Bwesn -O -K -X2.8i >> sinus_i.ps
425              gmt psbasemap -R60/200/-90/90 -Ji130/0.02i -Bx30g30 -By15g15 -BwEsn -O -X1.6i >> sinus_i.ps
426
427   Eckert IV [equal-area]
428       Pseudo-cylindrical  projection typically used for global maps only. Set
429       the central longitude and scale, e.g.,
430
431              gmt psbasemap -Rg -Jkf180/0.064c -Bafg -B+t"Eckert IV" > eckert4.ps
432
433   Eckert VI [equal-area]
434       Another pseudo-cylindrical projection typically used  for  global  maps
435       only. Set the central longitude and scale, e.g.,
436
437              gmt psbasemap -Rg -Jks180/0.064c -Bafg -B+t"Eckert VI" > eckert6.ps
438
439   Robinson
440       Projection  designed  to make global maps "look right". Set the central
441       longitude and width, e.g.,
442
443              gmt psbasemap -Rd -JN0/8i -Bafg -B+tRobinson > robinson.ps
444
445   Winkel Tripel
446       Yet another projection typically used for global maps only. You can set
447       the central longitude, e.g.,
448
449              gmt psbasemap -R90/450/-90/90 -JR270/25c -Bafg -B+t"Winkel Tripel" > winkel.ps
450
451   Mollweide [equal-area]
452       The  Mollweide  projection is also mostly used for global maps and thus
453       the spherical form is used. To get a 25-cm-wide world map  centered  on
454       the Dateline:
455
456              psbasemap -Rg -JW180/25c -Bafg -B+tMollweide > mollweide.ps
457
458   Van der Grinten
459       The  Van der Grinten projection is also mostly used for global maps and
460       thus the spherical form is used. To get a 18-cm-wide world map centered
461       on the Dateline:
462
463              gmt psbasemap -Rg -JV180/18c -Bafg -B+t"Van der Grinten" > grinten.ps
464
465   Arbitrary rotation
466       If  you  need  to  plot a map but have it rotated about a vertical axis
467       then use the -p option.  For instance, the rotate the basemap below  90
468       degrees about an axis centered on the map, try
469
470              gmt psbasemap -R10/40/10/40 -JM10c -P -Bafg -B+t"I am rotated" -p90+w25/25 -Xc > rotated.ps
471

CUSTOM LABELS OR INTERVALS

473       The -B option sets up a regular annotation interval and the annotations
474       derive from the corresponding x, y, or z  coordinates.   However,  some
475       applications  requires special control on which annotations to plot and
476       even replace the annotation with other  labels.  This  is  achieved  by
477       using  cintfile in the -B option, where intfile contains all the infor‐
478       mation about annotations, ticks, and even gridlines. Each record is  of
479       the  form  coord  type  [label], where coord is the coordinate for this
480       annotation (or tick or gridline), type is one or more  letters  from  a
481       (annotation),  i  interval annotation, f tickmark, and g gridline. Note
482       that a and i are mutually exclusive and cannot both appear in the  same
483       intfile.  Both  a and i requires you to supply a label which is used as
484       the plot annotation. If not given then a regular  formatted  annotation
485       based on the coordinate will occur.
486

RESTRICTIONS

488       For  some projections, a spherical earth is implicitly assumed. A warn‐
489       ing will notify the user if -V is set.
490

BUGS

492       The -B option is somewhat complicated to explain and comprehend.   How‐
493       ever, it is fairly simple for most applications (see examples).
494

SEE ALSO

496       gmt, gmt.conf, gmtcolors
497
499       2019, P. Wessel, W. H. F. Smith, R. Scharroo, J. Luis, and F. Wobbe
500
501
502
503
5045.4.5                            Feb 24, 2019                     PSBASEMAP(1)
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