psclip - To set up polygonal clip paths
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 ] [ -: ] [
psclip -C [ -K ] [ -O ]
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 running psclip a second time with the -C option only.
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 inch/degree, 1:xxxxx, or
width in inch (upper case modifier).
-Jmscale (Mercator - Greenwich and Equator as origin)
-Jmlon0/lat0/scale (Mercator - Give meridian and standard
-Joalon0/lat0/azimuth/scale (Oblique Mercator - point and
-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 Carree))
-Jtlon0/scale (TM - Transverse Mercator)
-Juzone/scale (UTM - Universal Transverse Mercator)
-Jylon0/lats/scale (Basic Cylindrical Projection)
-Jslon0/lat0/scale (General Stereographic)
-Jklon0/scale (Eckert VI)
-Jrlon0/scale (Winkel Tripel)
-Jpscale (Linear projection for polar (theta,r) coordinates)
-Jxx-scale[l|ppow][/y-scale[l|ppow]] (Linear, log, and power
More details can be found in the psbasemap manpages.
-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.
No space between the option flag and the associated arguments
-B Sets map boundary tickmark intervals. See psbasemap for 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 .gmtdefaults file. If used, GMT
default is 1 header record.
-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
-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 in inch [Default is (-0.75i/-
0.75i)]. Optionally, append a label, or c (which will plot the
-V Selects verbose mode, which will send progress reports to stderr
[Default runs "silently"].
Shift origin of plot by (x-shift,y-shift) inch [Default is
(a1i,a1i) for new plots, (0,0) for overlays]. Prepend a for
absolute coordinates; the default (r) will reset plot origin.
-Z For 3-D projections: Sets the z-level of the polygons .
-: Toggles between (longitude,latitude) and (latitude,longitude)
input/output. [Default is (longitude,latitude)].
-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].
To make an overlay PostScript file that will set up a complex clip
area to which subsequent plotting will be confined to, try:
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
gmt, grdmask, psbasemap, psmask
Man(1) output converted with