NAME
gmtdefaults - To list current GMT defaults
SYNOPSIS
gmtdefaults -D[u|s] | -L
DESCRIPTION
gmtdefaults lists the GMT parameter defaults if the option -D is used.
There are three ways to change some of the settings: (1) Use the com-
mand gmtset, (2) use any texteditor to edit the file .gmtdefaults4 in
your home or current directory (if you do not have this file, run gmt-
defaults -D > ~/.gmtdefaults4 to get one with the system default set-
tings), or (3) overrid any parameter by specifying one or more --PARAM-
ETER=VALUE statements on the commandline of any GMT command (PARAMETER
and VALUE are any combination listed below). The first two options are
permanent changes until explicitly changed back, while the last option
is emphemeral and only applies to the single GMT command that received
the override. GMT can provide default values in US or SI units. This
choice is determined by the contents of the gmt.conf file in GMT’s
share directory.
-D Print the system GMT defaults to standard output. Append u for
US defaults or s for SI defaults. [-D alone gives current choice
in gmt.conf].
-L Print the user’s currently active defaults to standard output.
Your currently active defaults come from the .gmtdefaults4 file
in the current working directory, if present; else from the
.gmtdefaults4 file in your home directory, if present; else from
the system defaults set at the time GMT was compiled.
GMT PARAMETERS
The following is a list of the parameters that are user-definable in
GMT. The parameter names are always given in UPPER CASE. The parameter
values are case-insensitive unless otherwise noted. The system defaults
are given in brackets [ for SI (and US) ]. Those marked * can be set on
the command line as well (the corresponding option is given in paren-
theses). Note that default distances and lengths below are given in
both cm or inch; the chosen default depends on your choice of default
unit (see MEASURE_UNIT). You can explicitly specify the unit used for
distances and lengths by appending c (cm), i (inch), m (meter), or p
(points). When no unit is indicated the value will be assumed to be in
the unit set by MEASURE_UNIT. Note that the printer resolution
DOTS_PR_INCH is always the number of dots or pixels per inch. Several
parameters take only TRUE or FALSE.
ANNOT_MIN_ANGLE
If the angle between the map boundary and the annotation base-
line is less than this minimum value (in degrees), the annota-
tion is not plotted (this may occur for certain oblique projec-
tions.) Give a value in the range 0-90. [20]
ANNOT_MIN_SPACING
If an annotation would be plotted less than this minimum dis-
tance from its closest neighbor, the annotation is not plotted
(this may occur for certain oblique projections.) [0]
ANNOT_FONT_PRIMARY
Font used for upper annotations, etc. [Helvetica]. Specify
either the font number or the font name (case sensitive!). The
39 available fonts are:
0 Helvetica
1 Helvetica-Bold
2 Helvetica-Oblique
3 Helvetica-BoldOblique
4 Times-Roman
5 Times-Bold
6 Times-Italic
7 Times-BoldItalic
8 Courier
9 Courier-Bold
10 Courier-Oblique
11 Courier-BoldOblique
12 Symbol
13 AvantGarde-Book
14 AvantGarde-BookOblique
15 AvantGarde-Demi
16 AvantGarde-DemiOblique
17 Bookman-Demi
18 Bookman-DemiItalic
19 Bookman-Light
20 Bookman-LightItalic
21 Helvetica-Narrow
22 Helvetica-Narrow-Bold
23 Helvetica-Narrow-Oblique
24 Helvetica-Narrow-BoldOblique
25 NewCenturySchlbk-Roman
26 NewCenturySchlbk-Italic
27 NewCenturySchlbk-Bold
28 NewCenturySchlbk-BoldItalic
29 Palatino-Roman
30 Palatino-Italic
31 Palatino-Bold
32 Palatino-BoldItalic
33 ZapfChancery-MediumItalic
34 ZapfDingbats
35 Ryumin-Light-EUC-H
36 Ryumin-Light-EUC-V
37 GothicBBB-Medium-EUC-H
38 GothicBBB-Medium-EUC-V
ANNOT_FONT_SIZE_PRIMARY
Font size (> 0) in points for map annotations. [14]
ANNOT_FONT_SECONDARY
Font to use for time axis secondary annotations. See
ANNOT_FONT_PRIMARY for available fonts [Helvetica].
ANNOT_FONT_SIZE_SECONDARY
Font size (> 0) for time axis secondary annotations in points
[16].
ANNOT_OFFSET_PRIMARY
Distance from end of tickmark to start of annotation [0.2c (or
0.075i)]. A negative offset will place the annotation inside the
map border.
ANNOT_OFFSET_SECONDARY
Distance from base of primary annotation to the top of the sec-
ondary annotation [0.2c (or 0.075i)] (Only applies to time axes
with both primary and secondary annotations).
BASEMAP_AXES
Sets which axes to draw and annotate. Case sensitive: Upper case
means both draw and annotate, lower case means draw axis only.
[WESN].
BASEMAP_FRAME_RGB
Color used to draw map boundaries and annotations. Give a
red/green/blue triplet, with each element in the 0-255 range.
[0/0/0] (black).
BASEMAP_TYPE
Choose between plain and fancy (thick boundary, alternating
black/white frame; append + for rounded corners) [fancy]. For
some map projections (e.g., Oblique Mercator), plain is the only
option even if fancy is set as default. In general, fancy only
applies to situations where the projected x and y directions
parallel the lon and lat directions (e.g., rectangular projec-
tions, polar projections).
CHAR_ENCODING
Names the eight bit character set being used for text in files
and in command line parameters. This allows GMT to ensure that
the PostScript output generates the correct characters on the
plot.. Choose from Standard, Standard+, ISOLatin1, ISOLatin1+,
and ISO-8859-x (where x is in the ranges 1-10 or 13-15). See
Appendix F for details [ISOLatin1+ (or Standard+)].
COLOR_BACKGROUND
Color used for the background of images (i.e., when z < lowest
colortable entry). Give a red/green/blue triplet, with each
element in the 0-255 range. [0/0/0] (black)
COLOR_FOREGROUND
Color used for the foreground of images (i.e., when z > highest
colortable entry). Give a red/green/blue triplet, with each
element in the 0-255 range. [255/255/255] (white)
COLOR_IMAGE
Selects which operator to use when rendering bit-mapped color
images. Due to the lack of the colorimage operator in some
PostScript implementations, GMT offers 2 different options:
adobe (Adobe’s colorimage definition) [Default].
tiles (Plot image as many individual rectangles).
COLOR_MODEL
Selects if color palette files contain rgb values (r,g,b in
0-255 range) or HSV values (h in 0-360, s,v in 0-1 range) [rgb].
COLOR_NAN
Color used for the non-defined areas of images (i.e., where z ==
NaN). Give a red/green/blue triplet, with each element in the
0-255 range. [128/128/128] (gray)
D_FORMAT
Output format (C language printf syntax) to be used when print-
ing double precision floating point numbers. For geographic
coordinates, see OUTPUT_DEGREE_FORMAT. [%lg].
DEGREE_SYMBOL
Determines what symbol is used to plot the degree symbol on geo-
graphic map annotations. Choose between ring, degree, colon,
none [ring].
DOTS_PR_INCH
Resolution of the plotting device (dpi). Note that in order to
be as compact as possible, GMT PostScript output uses integer
formats only so the resolution should be set depending on what
output device you are using. E.g, using 300 and sending the out-
put to a Linotype 300 phototypesetter (2470 dpi) will not take
advantage of the extra resolution (i.e., positioning on the page
and line thicknesses are still only done in steps of 1/300 inch;
of course, text will look smoother) [300].
ELLIPSOID
The (case sensitive) name of the ellipsoid used for the map pro-
jections [WGS-84]. Choose among
WGS-84 1984 World Geodetic System [Default]
OSU91A 1991 Ohio State University
OSU86F 1986 Ohio State University
Engelis 1985 Goodard Earth Models
SGS-85 1985 Soviet Geodetic System
MERIT-83 1983 United States Naval Observatory
GRS-80 1980 International Geodetic Reference System
Lerch 1979 For geoid modelling
ATS77 1977 Average Terrestrial System, Canada Maritime provinces
IAG-75 1975 International Association of Geodesy
Indonesian 1974 Applies to Indonesia
WGS-72 1972 World Geodetic System
NWL-10D 1972 Naval Weapons Lab (Same as WGS-72)
South-American 1969 Applies to South America
Fischer-1968 1968 Used by NASA for Mercury program
Modified-Mercury-1968 1968 Same as Fischer-1968
GRS-67 1967 International Geodetic Reference System
International-1967 1967 Worldwide use
WGS-66 1966 World Geodetic System
NWL-9D 1966 Naval Weapons Lab (Same as WGS-66)
Australian 1965 Applies to Australia
APL4.9 1965 Appl. Physics
Kaula 1961 From satellite tracking
Hough 1960 Applies to the Marshall Islands
WGS-60 1960 World Geodetic System
Fischer-1960 1960 Used by NASA for Mercury program
Mercury-1960 1960 Same as Fischer-1960
Modified-Fischer-1960 1960 Applies to Singapore
Fischer-1960-SouthAsia 1960 Same as Modified-Fischer-1960
Krassovsky 1940 Used in the (now former) Soviet Union
War-Office 1926 Developed by G. T. McCaw
International-1924 1924 Worldwide use
Hayford-1909 1909 Same as the International 1924
Helmert-1906 1906 Applies to Egypt
Clarke-1880 1880 Applies to most of Africa, France
Clarke-1880-Arc1950 1880 Modified Clarke-1880 for Arc 1950
Clarke-1880-IGN 1880 Modified Clarke-1880 for IGN
Clarke-1880-Jamaica 1880 Modified Clarke-1880 for Jamaica
Clarke-1880-Merchich 1880 Modified Clarke-1880 for Merchich
Clarke-1880-Palestine 1880 Modified Clarke-1880 for Palestine
Andrae 1876 Applies to Denmark and Iceland
Clarke-1866 1866 Applies to North America, the Philippines
Clarke-1866-Michigan 1866 Modified Clarke-1866 for Michigan
Struve 1860 Friedrich Georg Wilhelm Struve
Clarke-1858 1858 Clarke’s early ellipsoid
Airy 1830 Applies to Great Britain
Airy-Ireland 1830 Applies to Ireland in 1965
Modified-Airy 1830 Same as Airy-Ireland
Bessel 1841 Applies to Central Europe, Chile, Indonesia
Bessel-Schwazeck 1841 Applies to Namibia
Bessel-Namibia 1841 Same as Bessel-Schwazeck
Bessel-NGO1948 1841 Modified Bessel for NGO 1948
Everest-1830 1830 India, Burma, Pakistan, Afghanistan, Thailand
Everest-1830-Kalianpur 1830 Modified Everest for Kalianpur
(1956)
Everest-1830-Kertau 1830 Modified Everest for Kertau, Malaysia &
Singapore
Everest-1830-Timbalai 1830 Modified Everest for Timbalai, Sabah
Sarawak
Everest-1830-Pakistan 1830 Modified Everest for Pakistan
Walbeck 1819 First least squares solution by Finnish astronomer
Plessis 1817 Old ellipsoid used in France
Delambre 1810 Applies to Belgium
CPM 1799 Comm. des Poids et Mesures, France
Maupertius 1738 Really old ellipsoid used in France
Sphere 1980 The mean radius in GRS-80 (for spherical/plate tec-
tonics applications)
Note that for some global projections, GMT may default to GRS-80
Sphere regardless of ellipsoid actually chosen. A warning will
be given when this happens. If a different ellipsoid name than
those mentioned here is given, GMT will attempt to open a file
with that name in the current directory, and read a single
record that contains the ellipsoid name, year, major-axis (in
m), minor-axis (in m), and flattening (f) from the first record,
where the fields must be separated by white-space (not commas).
This way a custom ellipsoid (e.g., those used for other planets)
may be used. A negative flattening means GMT will recalculate
flattening from the two radii.
FIELD_DELIMITER
This setting determines what character will separate ASCII out-
put data columns written by GMT. Choose from tab, space, comma,
and none [tab].
FRAME_PEN
Thickness of pen used to draw plain map frame in dpi units or
points (append p) [1.25p].
FRAME_WIDTH
Width (> 0) of map borders for fancy map frame [0.2c (or
0.075i)].
GLOBAL_X_SCALE
Global x-scale (> 0) to apply to plot-coordinates before plot-
ting. Normally used to shrink the entire output down to fit a
specific height/width [1.0].
GLOBAL_Y_SCALE
Same, but for y-coordinates [1.0].
GRID_CROSS_SIZE_PRIMARY
Size (>= 0) of grid cross at lon-lat intersections. 0 means draw
continuous gridlines instead [0].
GRID_PEN_PRIMARY
Pen thickness used to draw grid lines in dpi units or points
(append p) [0.25p].
GRID_CROSS_SIZE_SECONDARY
Size (>= 0) of grid cross at secondary lon-lat intersections. 0
means draw continuous gridlines instead [0].
GRID_PEN_SECONDARY
Pen thickness used to draw grid lines in dpi units or points
(append p) [0.5p].
GRIDFILE_SHORTHAND
If TRUE, all gridfile names are examined to see if they use the
file extension shorthand discussed in Section 4.17 of the GMT
Technical Reference and Cookbook. If FALSE, no filename expan-
sion is done [FALSE].
HEADER_FONT
Font to use when plotting headers. See ANNOT_FONT_PRIMARY for
available fonts [Helvetica].
HEADER_FONT_SIZE
Font size (> 0) for header in points [36].
HEADER_OFFSET
Distance from top of axis annotations (or axis label, if
present) to base of plot header [0.5c (or 0.1875i)].
HSV_MIN_SATURATION
Minimum saturation (0-1) assigned for most negative intensity
value [1.0].
HSV_MAX_SATURATION
Maximum saturation (0-1) assigned for most positive intensity
value [0.1].
HSV_MIN_VALUE
Minimum value (0-1) assigned for most negative intensity value
[0.3].
HSV_MAX_VALUE
Maximum value (0-1) assigned for most positive intensity value
[1.0].
INPUT_CLOCK_FORMAT
Formatting template that indicates how an input clock string is
formatted. This template is then used to guide the reading of
clock strings in data fields. To properly decode 12-hour clocks,
append am or pm (or upper case) to match your data records. As
examples, try hh:mm, hh:mm:ssAM, etc. [hh:mm:ss].
INPUT_DATE_FORMAT
Formatting template that indicates how an input date string is
formatted. This template is then used to guide the reading of
date strings in data fields. You may specify either Gregorian
calendar format or ISO week calendar format. Gregorian calendar:
Use any combination of yyyy (or yy for 2-digit years; if so see
Y2K_OFFSET_YEAR), mm (or o for abbreviated month name in the
current time language), and dd, with or without delimiters. For
day-of-year data, use jjj instead of mm and/or dd. Examples can
be ddmmyyyy, yy-mm-dd, dd-o-yyyy, yyyy/dd/mm, yyyy-jjj, etc.
ISO Calendar: Expected template is yyyy[-]W[-]ww[-]d, where ww
is ISO week and d is ISO week day. Either template must be con-
sistent, e.g., you cannot specify months if you don’t specify
years. Examples are yyyyWwwd, yyyy-Www, etc. [yyyy-mm-dd].
INTERPOLANT
Determines if linear (linear), Akima’s spline (akima), or natu-
ral cubic spline (cubic) should be used for 1-D interpolations
in various programs [akima].
IO_HEADER * (-H)
Specifies whether input/output ASCII files have header record(s)
or not [FALSE].
N_HEADER_RECS
Specifies how many header records to expect if -H is turned on
[1].
LABEL_FONT
Font to use when plotting labels below axes. See ANNOT_FONT_PRI-
MARY for available fonts [Helvetica].
LABEL_FONT_SIZE
Font size (> 0) for labels in points [24].
LABEL_OFFSET
Distance from base of axis annotations to the top of the axis
label [0.3c (or 0.1125i)].
LINE_STEP
Determines the maximum length (> 0) of individual straight line-
segments when drawing arcuate lines [0.025c (or 0.01i)]
MAP_SCALE_FACTOR
Changes the default map scale factor used for the Polar Stereo-
graphic [0.9996], UTM [0.9996], and Transverse Mercator [1] pro-
jections in order to minimize areal distortion. Provide a new
scale-factor or leave as default.
MAP_SCALE_HEIGHT
Sets the height (> 0) on the map of the map scale bars drawn by
various programs [0.2c (or 0.075i)].
MEASURE_UNIT
Sets the unit length. Choose between cm, inch, m, and point.
[cm]. Note that, in GMT, one point is defined as 1/72 inch (the
PostScript definition), while it is often defined as 1/72.27
inch in the typesetting industry. There is no universal defini-
tion.
N_COPIES * (-c)
Number of plot copies to make [1].
OBLIQUE_ANNOTATION
This integer is a sum of 6 bit flags (most of which only are
relevant for oblique projections): If bit 1 is set (1), annota-
tions will occur wherever a gridline crosses the map boundaries,
else longitudes will be annotated on the lower and upper bound-
aries only, and latitudes will be annotated on the left and
right boundaries only. If bit 2 is set (2), then longitude anno-
tations will be plotted horizontally. If bit 3 is set (4), then
latitude annotations will be plotted horizontally. If bit 4 is
set (8), then oblique tickmarks are extended to give a projec-
tion equal to the specified tick_length. If bit 5 is set (16),
tickmarks will be drawn normal to the border regardless of grid-
line angle. If bit 6 is set (32), then latitude annotations
will be plotted parallel to the border. To set a combination of
these, add up the values in parentheses. [1].
OUTPUT_CLOCK_FORMAT
Formatting template that indicates how an output clock string is
to be formatted. This template is then used to guide the writing
of clock strings in data fields. To use a floating point format
for the smallest unit (e.g. seconds), append .xxx, where the
number of x indicates the desired precision. If no floating
point is indicated then the smallest specified unit will be
rounded off to nearest integer. For 12-hour clocks, append am,
AM, a.m., or A.M. (GMT will replace a|A with p|P for pm). If
your template starts with a leading hyphen (-) then each integer
item (y,m,d) will be printed without leading zeros (default uses
fixed width formats). As examples, try hh:mm, hh.mm.ss,
hh:mm:ss.xxxx, hha.m., etc. [hh:mm:ss].
OUTPUT_DATE_FORMAT
Formatting template that indicates how an output date string is
to be formatted. This template is then used to guide the writing
of date strings in data fields. You may specify either Gregorian
calendar format or ISO week calendar format. Gregorian calendar:
Use any combination of yyyy (or yy for 2-digit years; if so see
Y2K_OFFSET_YEAR), mm (or o for abbreviated month name in the
current time language), and dd, with or without delimiters. For
day-of-year data, use jjj instead of mm and/or dd. As examples,
try yy/mm/dd, yyyy=jjj, dd-o-yyyy, dd-mm-yy, yy-mm, etc. ISO
Calendar: Expected template is yyyy[-]W[-]ww[-]d, where ww is
ISO week and d is ISO week day. Either template must be consis-
tant, e.g., you cannot specify months if you don’t specify
years. As examples, try yyyyWww, yy-W-ww-d, etc. If your
template starts with a leading hyphen (-) then each integer item
(y,m,d) will be printed without leading zeros (default uses
fixed width formats) [yyyy-mm-dd].
OUTPUT_DEGREE_FORMAT
Formatting template that indicates how an output geographical
coordinate is to be formatted. This template is then used to
guide the writing of geographical coordinates in data fields.
The template is in general of the form [+|-]D or
[+|-]ddd[:mm[:ss]][.xxx][F]. The various terms have the follow-
ing purpose:
+|- + means output longitude in the 0 to 360 range
- means output longitude in the -360 to 0 range
If not given, use the -180 to +180 range
D Use D_FORMAT for floating point degrees.
ddd Fixed format integer degrees
: delimiter
mm Fixed format integer arc minutes
ss Fixed format integer arc seconds
.xxx Floating fraction of previous integer field, fixed
width.
F Encode sign using WESN suffix
The default is +D.
PAGE_COLOR
Sets the color of the imaging background, i.e., the paper. Give
a red/green/blue triplet, with each element in the 0-255 range.
[255/255/255] (white).
PAGE_ORIENTATION * (-P)
Sets the orientation of the page. Choose portrait or landscape
[landscape].
PAPER_MEDIA
Sets the physical format of the current plot paper [A4]. The
following formats (and their widths and heights in points) are
recognized (Additional site-specific formats may be specified in
the gmtmedia.d file in $GMTHOME/share; see that file for
details):
Media width height
A0 2380 3368
A1 1684 2380
A2 1190 1684
A3 842 1190
A4 595 842
A5 421 595
A6 297 421
A7 210 297
A8 148 210
A9 105 148
A10 74 105
B0 2836 4008
B1 2004 2836
B2 1418 2004
B3 1002 1418
B4 709 1002
B5 501 709
archA 648 864
archB 864 1296
archC 1296 1728
archD 1728 2592
archE 2592 3456
flsa 612 936
halfletter 396 612
note 540 720
letter 612 792
legal 612 1008
11x17 792 1224
ledger 1224 792
For a completely custom format (e.g., for large format plotters)
you may also specify Custom_WxH, where W and H are in points.
To force the printer to request a manual paper feed, append ’-’
to the media name, e.g., A3- will require the user to insert a
A3 paper into the printer’s manual feed slot. To indicate you
are making an EPS file, append ’+’ to the media name. Then, GMT
will attempt to issue a tight bounding box [Default Bounding Box
is the paper dimension].
PLOT_CLOCK_FORMAT
Formatting template that indicates how an output clock string is
to be plotted. This template is then used to guide the format-
ting of clock strings in plot annotations. See OUTPUT_CLOCK_FOR-
MAT for details. [hh:mm:ss].
PLOT_DATE_FORMAT
Formatting template that indicates how an output date string is
to be plotted. This template is then used to guide the plotting
of date strings in data fields. See OUTPUT_DATE_FORMAT for
details. In addition, you may use a single o instead of mm (to
plot month name) and u instead of W[-]ww to plot "Week ##". Both
of these text strings will be affected by the TIME_LANGUAGE set-
ting. [yyyy-mm-dd].
PLOT_DEGREE_FORMAT
Formatting template that indicates how an output geographical
coordinate is to be plotted. This template is then used to guide
the plotting of geographical coordinates in data fields. See
OUTPUT_DEGREE_FORMAT for details. In addition, you can append A
which plots the absolute value of the coordinate. The default is
+ddd:mm:ss. Not all items may be plotted as this depends on the
annotation interval.
PS_COLOR
Determines whether PostScript output should use RGB or CMYK when
specifying color. Select from rgb or cmyk [rgb].
PSIMAGE_FORMAT
Determines whether images created in PostScript should use hex-
adecimal (i.e., ascii) or binary format. The latter takes up
only half as much space and executes faster but may choke some
printers, especially those off serial ports. Select hex or bin
[hex].
TICK_LENGTH
The length of a tickmark. Normally, tickmarks are drawn on the
outside of the map boundaries. To select interior tickmarks, use
a negative tick_length [0.2c (or 0.075i)].
TICK_PEN
The pen thickness to be used for tickmarks in dpi units or
points (append p) [0.5p].
TIME_FORMAT_PRIMARY
Controls how primary month-, week-, and weekday-names are for-
matted. Choose among full, abbreviated, and character. If the
leading f, a, or c are replaced with F, A, and C the entire
annotation will be in upper case.
TIME_FORMAT_SECONDARY
Controls how secondary month-, week-, and weekday-names are for-
matted. Choose among full, abbreviated, and character. If the
leading f, a, or c are replaced with F, A, and C the entire
annotation will be in upper case.
TIME_EPOCH
This parameter is active only when TIME_SYSTEM is set to OTHER.
It is a string of the form yyyy-mm-ddThh:mm:ss (Gregorian) or
yyyy-Www-ddThh:mm:ss (ISO) indicating the value of the calendar
and clock at the origin (zero point) of relative time units.
TIME_IS_INTERVAL
Used when input calendar data should be truncated and adjusted
to the middle of the relevant interval. In the following discus-
sion, the unit u can be one of these time units: (y year, o
month, u ISO week, d day, h hour, m minute, and c second).
TIME_IS_INTERVAL can have any of the following three values: 1.
OFF [Default]. No adjustment, time is decoded as given. 2. +nu.
Activate interval adjustment for input by truncate to previous
whole number of n units and then center time on the following
interval. 3. -nu. Same, but center time on the previous inter-
val. For example, with TIME_IS_INTERVAL = +1o, an input data
string like 1999-12 will be interpreted to mean
1999-12-15T12:00:00.0 (exactly middle of December), while if
TIME_IS_INTERVAL = OFF then that date is interpreted to mean
1999-12-1T00:00:00.0 (start of December).
TIME_INTERVAL_FRACTION
Determines if partial intervals at the start and end of an axis
should be annotated. If the range of the partial interval
exceeds the specified fraction of the normal interval stride we
will place the annotation centered on the partial interval
[0.5].
TIME_LANGUAGE
Language to use when plotting calendar items such as months and
days. Select from:
BR Brazilian Portuguese
CN1 Simplified Chinese
CN2 Traditional Chinese
DE German
DK Danish
EH Basque
ES Spanish
FI Finnish
FR French
GR Greek
HU Hungarian
IE Irish
IL Hebrew
IT Italian
JP Japanese
NL Dutch
NO Norwegian
PL Polish
PT Portuguese
RU Russian
SE Swedish
TO Tongan
TR Turkish
UK British English
US US English
If your language is not supported, please examine the
$GMTHOME/share/time/us.d file and make a similar file. Please
submit it to the GMT Developers for official inclusion.
TIME_SYSTEM
Determines what the time epoch relative time refers to and what
the units are. Choose from one of the preset systems below
(epoch and units are indicated):
JD Julian Date, -4713-11-25T12:00:00 d
MJD Modified Julian Date, 1858-11-27T00:00:00 d
J2000 2000-01-01T00:00:00 d
S1985 1985-01-01T00:00:00 c
UNIX 1970-01-01T00:00:00 c
or specify OTHER and supply your own TIME_EPOCH and TIME_UNIT
settings [J2000].
TIME_UNIT
This parameter is active only when TIME_SYSTEM is set to OTHER,
and specifies the units of relative time data. Choose y (year),
d (day), h (hour), m (minute), or c (second).
TIME_WEEK_START
When weeks are indicated on time axes, this parameter determines
the first day of the week for Gregorian calendars. (The ISO
weekly calendar always begins weeks with Monday.) [Monday (or
Sunday)].
UNIX_TIME * (-U)
Specifies if a UNIX system time stamp should be plotted at the
lower left corner of the plot [FALSE].
UNIX_TIME_POS * (-U)
Sets the position of the UNIX time stamp relative to the current
plots lower left corner [-2c/-2c (or -0.75i/-0.75i)].
VECTOR_SHAPE
Determines the shape of the head of a vector. Normally (i.e.,
for vector_shape = 0), the head will be triangular, but can be
changed to an arrow (1). Intermediate settings gives something
in between [0].
VERBOSE * (-V)
Determines if GMT programs should display run-time information
or run silently [FALSE].
X_AXIS_LENGTH
Sets the default length (> 0) of the x-axis [25c (or 9i)].
Y_AXIS_LENGTH
Sets the default length (> 0) of the y-axis [15c (or 6i)].
X_ORIGIN * (-X)
Sets the x-coordinate of the origin on the paper for a new plot
[2.5c (or 1i)]. For an overlay, the default offset is 0.
Y_ORIGIN * (-Y)
Sets the y-coordinate of the origin on the paper for a new plot
[2.5c (or 1i)]. For an overlay, the default offset is 0.
Y2K_OFFSET_YEAR
When 2-digit years are used to represent 4-digit years (see var-
ious DATE_FORMATs), Y2K_OFFSET_YEAR gives the first year in a
100-year sequence. For example, if Y2K_OFFSET_YEAR is 1729, then
numbers 29 through 99 correspond to 1729 through 1799, while
numbers 00 through 28 correspond to 1800 through 1828. [1950].
XY_TOGGLE * (-:)
Set if the first two columns of input and output files contain
(latitude,longitude) or (y,x) rather than the expected (longi-
tude,latitude) or (x,y). FALSE means we have (x,y) both on input
and output. TRUE means both input and output should be (y,x). IN
means only input has (y,x), while OUT means only output should
be (y,x). [FALSE].
Y_AXIS_TYPE
Determines if the annotations for a y-axis (for linear projec-
tions) should be plotted horizontally (hor_text) or vertically
(ver_text) [hor_text].
EXAMPLES
To get a copy of the GMT parameter defaults in your home directory, run
gmtdefaults -D > ~/.gmtdefaults4
You may now change the settings by editing this file using a text edi-
tor of your choice, or use gmtset to change specified parameters on the
command line.
BUGS
If you have typographical errors in your .gmtdefaults4 file(s), a warn-
ing message will be issued, and the GMT defaults for the affected
parameters will be used.
SEE ALSO
gmt(l), gmtset(l)
GMT4.0 1 Oct 2004 GMTDEFAULTS(l)
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