NAME

       psclip - To set up polygonal clip paths


SYNOPSIS

       psclip xyfiles -Jparameters -Rwest/east/south/north[r] [ -Btickinfo ] [
       -Eaz/el ] [ -K ] [ -N ] [ -M[flag] ] [ -O ] [ -P ] [ -U[/dx/dy/][label]
       ] [ -V ] [ -Xx-shift ] [ -Yy-shift ] [ -Zzlevel ] [ -ccopies ] [ -: ] [
       -bi[s][n] ] [ -f[i|o]colinfo ]

       psclip -C [ -K ] [ -O ]


DESCRIPTION

       psclip reads (x,y) file(s) [or standard input] and draws polygons  that
       are  activated  as  clipping paths. Several files may be read to create
       complex paths consisting of  several  non-connecting  segments.  As  an
       option  (-N),  the  user may choose to reverse the sense of what is the
       inside and outside of the paths.  After subsequent plotting, which will
       be clipped against these paths, the clipping may be deactivated by run-
       ning psclip a second time with the -C option only.

       xyfiles
              ASCII [or binary, see -b] file(s) with  (x,y)  values  for  clip
              polygons. If no files are given, the standard input is read.

       -C     Mark  end  of  existing  clip  path. No input file or projection
              information are needed.

       -J     Selects the map projection. Scale is  UNIT/degree,  1:xxxxx,  or
              width  in  UNIT  (upper case modifier).  UNIT is cm, inch, or m,
              depending on the MEASURE_UNIT setting in .gmtdefaults4, but this
              can be overridden on the command line by appending c, i, or m to
              the scale/width value.  For map height, max  dimension,  or  min
              dimension, append h, +, or - to the width, respectively.

              CYLINDRICAL PROJECTIONS:

              -Jclon0/lat0/scale (Cassini)
              -Jjlon0/scale (Miller)
              -Jmscale (Mercator - Greenwich and Equator as origin)
              -Jmlon0/lat0/scale (Mercator - Give meridian and standard paral-
              lel)
              -Joalon0/lat0/azimuth/scale  (Oblique  Mercator  -   point   and
              azimuth)
              -Joblon0/lat0/lon1/lat1/scale (Oblique Mercator - two points)
              -Joclon0/lat0/lonp/latp/scale  (Oblique  Mercator  -  point  and
              pole)
              -Jqlon0/scale (Equidistant Cylindrical  Projection  (Plate  Car-
              ree))
              -Jtlon0/scale (TM - Transverse Mercator, with Equator as y = 0)
              -Jtlon0/lat0/scale (TM - Transverse Mercator, set origin)
              -Juzone/scale (UTM - Universal Transverse Mercator)
              -Jylon0/lats/scale (Basic Cylindrical Projection)

              AZIMUTHAL PROJECTIONS:

              -Jalon0/lat0/scale (Lambert).
              -Jelon0/lat0/scale (Equidistant).
              -Jflon0/lat0/horizon/scale (Gnomonic).
              -Jglon0/lat0/scale (Orthographic).
              -Jslon0/lat0/[slat/]scale (General Stereographic)

              CONIC PROJECTIONS:

              -Jblon0/lat0/lat1/lat2/scale (Albers)
              -Jdlon0/lat0/lat1/lat2/scale (Equidistant)
              -Jllon0/lat0/lat1/lat2/scale (Lambert)

              MISCELLANEOUS PROJECTIONS:

              -Jhlon0/scale (Hammer)
              -Jilon0/scale (Sinusoidal)
              -Jk[f|s]lon0/scale (Eckert IV (f) and VI (s))
              -Jnlon0/scale (Robinson)
              -Jrlon0/scale (Winkel Tripel)
              -Jvlon0/scale (Van der Grinten)
              -Jwlon0/scale (Mollweide)

              NON-GEOGRAPHICAL PROJECTIONS:

              -Jp[a]scale[/origin]  (polar  (theta,r)  coordinates, optional a
              for azimuths and offset theta [0])
              -Jxx-scale[l|ppow][/y-scale[l|ppow]][d] (Linear, log, and  power
              scaling)
              More details can be found in the psbasemap man pages.

       -R     xmin,  xmax,  ymin, and ymax specify the Region of interest. For
              geographic regions,  these  limits  correspond  to  west,  east,
              south,  and north and you may specify them in decimal degrees or
              in [+-]dd:mm[:ss.xxx][W|E|S|N] format. Append r  if  lower  left
              and  upper  right map coordinates are given instead of wesn. The
              two shorthands  -Rg  -Rd  stand  for  global  domain  (0/360  or
              -180/+180  in longitude respectively, with -90/+90 in latitude).
              For calendar time coordinates you may either give relative  time
              (relative  to  the  selected  TIME_EPOCH  and  in  the  selected
              TIME_UNIT; append t to -JX|x), or  absolute  time  of  the  form
              [date]T[clock]  (append  T  to  -JX|x). At least one of date and
              clock must be present; the T is always required. The date string
              must  be  of  the form [-]yyyy[-mm[-dd]] (Gregorian calendar) or
              yyyy[-Www[-d]] (ISO week calendar), while the clock string  must
              be  of  the form hh:mm:ss[.xxx]. The use of delimiters and their
              type and positions must be as indicated  (however,  input/output
              and plotting formats are flexible).


OPTIONS

       No space between the option flag and the associated arguments


       -B     Sets  map  boundary  annotation  and tickmark intervals; see the
              psbasemap man page for all the details.

       -E     Sets the viewpoint’s azimuth and elevation [180/90].

       -H     Input file(s) has Header record(s). Number of header records can
              be  changed  by  editing  your  .gmtdefaults4 file. If used, GMT
              default is 1 header record. Use -Hi if only  input  data  should
              have  header  records  [Default will write out header records if
              the input data have them].

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

       -M     Multiple  segment file. Segments are separated by a record whose
              first character is <flag>.  [Default is ’>’].

       -N     Invert the sense of what is inside and outside,  i.e.,  use  the
              outside of the polygons for clipping.

       -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.   Give
              c to center plot using current page size.

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

       -:     Toggles  between  (longitude,latitude)  and (latitude,longitude)
              input and/or output. [Default is (longitude,latitude)].   Append
              i  to  select  input  only  or o to select output only. [Default
              affects both].

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

       -bi    Selects binary input. Append s for single precision [Default  is
              double].   Append  n  for  the  number  of columns in the binary
              file(s).
              [Default is 2 input columns].

       -f     Special formatting of input and output  columns  (time  or  geo-
              graphical  data)  Specify  i(nput)  or o(utput) [Default is both
              input and output].  Give one or more columns (or column  ranges)
              separated by commas.  Append T (Absolute calendar time), t (time
              relative to chosen TIME_EPOCH), x (longitude), y  (latitude),  g
              (geographic coordinate), or f (floating point) to each column or
              column range item.


EXAMPLES

       To make an overlay PostScript file that will set up a complex clip area
       to which subsequent plotting will be confined, run:

       psclip my_region.xy -R0/40/0/40 -Jm0.3i -O -K > clip_mask_on.ps

       To deactivate the clipping in an existing plotfile, run:

       psclip -C -O >> complex_plot.ps


BUGS

       psclip cannot handle polygons that contain the south or north pole. For
       such polygons, you should split them into two and make each  explicitly
       contain the polar point. The two clip polygons will combine to give the
       desired effect.


SEE ALSO

       gmt(l), grdmask(l), psbasemap(l), psmask(l)



GMT4.0                            1 Oct 2004                         PSCLIP(l)

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