Provided by: gmt-manpages_3.4.4-1_all 
NAME
pscoast - To plot land-masses, water-masses, coastlines, borders, and rivers
SYNOPSIS
pscoast -Jparameters -Rwest/east/south/north[r] [ -Amin_area[min_level [
-Eazimuth/elevation ] [ -Gfill ] [ -Iriver[/pen] ] [ -K ] [
-L[f][x]lon0/lat0/slat/length[m|n|k] ] [ -M[flag] ] [ -Nborder[/pen] ] [ -O ] [ -P ] [ -Q
] [ -Sfill ] [ -U[/dx/dy/][label] ] [ -V ] [ -Wpen ] [ -Xx-shift ] [ -Yy-shift ] [
-ccopies ] [ -bo[s][n] ]
DESCRIPTION
pscoast plots grayshaded, colored, or textured land-masses [or water-masses] on maps and
[optionally] draws coastlines, rivers, and political boundaries. Alternatively, it can (1)
issue clip paths that will contain all land or all water areas, or (2) dump the data to an
ASCII table. The datafiles come in 5 different resolutions: (f)ull, (h)igh,
(i)ntermediate, (l)ow, and (c)rude. The full resolution files amount to more than 55 Mb of
data and provide great detail; for maps of larger geographical extent it is more
economical to use one of the other resolutions. If the user selects to paint the land-
areas and does not specify fill of water-areas then the latter will be transparent (i.e.,
earlier graphics drawn in those areas will not be overwritten). Likewise, if the water-
areas are painted and no land fill is set then the land-areas will be transparent. The
PostScript code is written to standard output.
No space between the option flag and the associated arguments. Use upper case for
the option flags and lower case for modifiers.
-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
.gmtdefaults, but this can be overridden on the command line by appending the c, i,
or m to the scale/width value.
CYLINDRICAL PROJECTIONS:
-Jclon0/lat0/scale (Cassini)
-Jjlon0/scale (Miller)
-Jmscale (Mercator - Greenwich and Equator as origin)
-Jmlon0/lat0/scale (Mercator - Give meridian and standard parallel)
-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 Carree))
-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]] (Linear, log, and power scaling)
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.
OPTIONS
-A Features with an area smaller than min_area in km^2 or of hierarchical level that
is lower than min_level or higher than max_level will not be plotted [Default is
0/0/4 (all features)]. See DATABASE INFORMATION below for more details.
-B Sets map boundary tickmark intervals. See psbasemap for details.
-C Set the shade (0-255), color (r/g/b), or pattern (p|Pdpi/pattern; see -G) for lakes
[Default is the fill chosen for "wet" areas (-S)].
-D Selects the resolution of the data set to use ((f)ull, (h)igh, (i)ntermediate,
(l)ow, and (c)rude). The resolution drops off by 80% between data sets. [Default is
l].
-E Sets the viewpoint's azimuth and elevation (for perspective view) [180/90]'
-G Select painting or clipping of "dry" areas. Append a shade, color, pattern, or c
for clipping. Specify the shade (0-255) or color (r/g/b, each in 0-255).
-I Draw rivers. Specify the type of rivers and [optionally] append pen attributes
[Default pen: width = 1, color = 0/0/0, texture = solid]. Choose from the list of
river types below. Repeat option -I as often as necessary.
1 = Permanent major rivers
2 = Additional major rivers
3 = Additional rivers
4 = Minor rivers
5 = Intermittent rivers - major
6 = Intermittent rivers - additional
7 = Intermittent rivers - minor
8 = Major canals
9 = Minor canals
10 = Irrigation canals
a = All rivers and canals (1-10)
r = All permanent rivers (1-4)
i = All intermittent rivers (5-7)
c = All canals (8-10)
-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
instead. 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].
-M Dumps a single multisegment ASCII (or binary, see -bo) file to standard output. No
plotting occurs. Specify any combination of -W, -I, -N. Optionally, you may append
the flag character that is written at the start of each segment header ['>'].
-N Draw political boundaries. Specify the type of boundary and [optionally] append pen
attributes [Default pen: width = 1, color = 0/0/0, texture = solid]. Choose from
the list of boundaries below. Repeat option -N as often as necessary.
1 = National boundaries
2 = State boundaries within the Americas
3 = Marine boundaries
a = All boundaries (1-3)
-bo Selects binary output. Append s for single precision [Default is double].
-P Selects Portrait plotting mode [GMT Default is Landscape, see gmtdefaults to change
this].
-Q Mark end of existing clip path. No projection information is needed.
-S Select painting or clipping of "wet" areas. Append the shade (0-255), color
(r/g/b), pattern (see -G), or c for clipping.
-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"].
-W Draw coastlines. [Default is no coastlines]. Append pen attributes [Defaults: width
= 1, color = 0/0/0, texture = solid].
-X -Y Shift origin of plot by (x-shift,y-shift). Prepend a for absolute coordinates; the
default (r) will reset plot origin.
-c Specifies the number of plot copies. [Default is 1]
-bo Selects binary output. Append s for single precision [Default is double].
EXAMPLES
To plot a green Africa with white outline on blue background, with permanent major rivers
in thick blue pen, additional major rivers in thin blue pen, and national borders as
dashed lines on a Mercator map at scale 0.1 inch/degree, try
pscoast -R-30/30/-40/40 -Jm0.1i -B5 -I1/1p/0/0/255 -I2/0.25p/0/0/255 -N1/0.25tap
-W0.25p/255/255/255 -G0/255/0 -S0/0/255 -P > africa.ps
To plot Iceland using the lava pattern (# 28) at 100 dots per inch, on a Mercator map at
scale 1 cm/degree, try
pscoast -R-30/-10/60/65 -Jm1c -B5 -Gp100/28 > iceland.ps
To initiate a clip path for Africa so that the subsequent colorimage of gridded topography
is only seen over land, using a Mercator map at scale 0.1 inch/degree, try
pscoast -R-30/30/-40/40 -Jm0.1i -B5 -Gc -P -K > africa.ps
grdimage -Jm0.1i etopo5.grd -Ccolors.cpt -O -K >> africa.ps
pscoast -Q -O >> africa.ps
DATABASE INFORMATION
The coastline database is compiled from two sources: World Vector Shorelines (WVS) and CIA
World Data Bank II (WDBII). In particular, all level-1 polygons (ocean-land boundary) are
derived from the more accurate WVS while all higher level polygons (level 2-4,
representing land/lake, lake/island-in-lake, and island-in-lake/lake-in-island-in-lake
boundaries) are taken from WDBII. Much processing has taken place to convert WVS and WDBII
data into usable form for GMT: assembling closed polygons from line segments, checking for
duplicates, and correcting for crossings between polygons. The area of each polygon has
been determined so that the user may choose not to draw features smaller than a minimum
area (see -A); one may also limit the highest hierarchical level of polygons to be
included (4 is the maximum). The 4 lower-resolution databases were derived from the full
resolution database using the Douglas-Peucker line-simplification algorithm. The
classification of rivers and borders follow that of the WDBII. See the GMT Cookbook and
Technical Reference Appendix K for further details.
pscoast will first look for coastline files in directory $GMTHOME/share (where $GMTHOME is
an environmental variable). If the desired file is not found, it will look for the file
coastline.conf in the same directory. This file may contain any number of records that
each holds the full pathname of an alternative directory. Comment lines (#) and blank
lines are allowed. The desired file is then sought for in the alternate directories.
BUGS
The options to fill (-C -G -S) may not always work if the Azimuthal equidistant projection
is chosen (-Je|E). If the antipole of the projection is in the oceans it will most likely
work. If not, try to avoid using projection center coordinates that are even multiples of
the coastline bin size (1, 2, 5, 10, and 20 degrees for f, h, i, l, c, respectively). This
projection is not supported for clipping.
The political borders are for the most part 1970ies-style and do not reflect the recent
border rearrangments in Europe. We intend to update these as high-resolution data become
avaiable to us.
Some users of pscoast will not be satisfied with what they find for the Antarctic
shoreline. In Antarctica, the boundary between ice and ocean varies seasonally and
interannually. There are some areas of permanent sea ice. In addition to these time-
varying ice-ocean boundaries, there are also ice grounding lines where ice goes from
floating on the sea to sitting on land, and lines delimiting areas of rock outcrop. For
consistency's sake, we have used the World' Vector Shoreline throughout the world in
pscoast, as described in the GMT cookbook Appendix K. Users who need specific boundaries
in Antarctica should get the Antarctic Digital Database, prepared by the British Antarctic
Survey, Scott Polar Research Institute, World Conservation Monitoring Centre, under the
auspices of the Scientific Committee on Antarctic Research. This data base contains
various kinds of limiting lines for Antarctica and is available on CD-ROM. It is published
by the Scientific Committee on Antarctic Research, Scott Polar Research Institute,
Lensfield Road, Cambridge CB2 1ER, United Kingdom.
SEE ALSO
gmtdefaults(1gmt), gmt(1gmt), grdlandmask(1gmt), psbasemap(1gmt)
1 Jan 2004 PSCOAST(l)