gmtdefaults

NAME

gmtdefaults - To list current GMT defaults

gmtdefaults lists the GMT parameter defaults if the option -D is used. To change some of the settings, use any texteditor to edit the file .gmtdefaults in your home or current directory. If you do not have this file in your home or current directory, run gmtdefaults -D > ~/.gmtdefaults to get the system settings. 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.'

GMT PARAMETERS

The following is a list of the 58 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 [ ]. Those marked * can be set on the command line as well (the corresponding option is given in parentheses). 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.

ANOT_MIN_ANGLE: If the angle between the map boundary and the annotation baseline is less than this minimum value (in degrees), the annotation is not plotted (this may occur for certain oblique projections.) Give a value in the range 0-90. [20]

ANOT_MIN_SPACING: If an annotation would be plotted less than this minimum distance from its closest neighbor, the annotation is not plotted (this may occur for certain oblique projections.) [0]

ANOT_FONT: Font used for tick mark 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

ANOT_FONT_SIZE: Font size (> 0) in points for map annotations. [14]

ANOT_OFFSET: Distance from end of tickmark to start of annotation [0.2c (or 0.075i)]. A negative offset will place the anotation inside the map border.

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) [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 projections, polar projections).

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 = 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 syntax) to be used when printing double precision floating point numbers If it is NOT a 'g'-type format (as the default is), the format is used directly in anotations. [%lg].

DEGREE_FORMAT: Output format to be used when annotating map boundaries. Choose between 12 formats:

0 Longitudes go from 0 to 360, latitudes from -90 to 90 [Default].

1 Longitudes go from -180 to 180, latitudes from -90 to 90.

2 Longitudes are unsigned 0 to 180, latitudes unsigned 0 to 90.

3 Same as 2, but with letters W, E, S, or N appended as appropriate.

4 Same as 0, with decimal degrees instead of degrees, minutes, and seconds.

5 Same as 1, with decimal degrees instead of degrees, minutes, and seconds.

6 Same as 4, but with letters W, E, S, or N appended as appropriate.

7 Same as 5, but with letters W, E, S, or N appended as appropriate.

8 Same as 0, with degrees and decimal minutes instead of degrees, minutes, and seconds.

9 Same as 1, with degrees and decimal minutes instead of degrees, minutes, and seconds.

10 Same as 2, with degrees and decimal minutes instead of degrees, minutes, and seconds.

11 Same as 3, with degrees and decimal minutes instead of degrees, minutes, and seconds.

Add 100 to these values to use the large degree symbol character (octal 217) [Default is the small degree symbol (octal 312)].

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 output 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 projections [WGS-84]. Choose among

WGS-84 1984 World Geodetic System

GRS-80 1980 International Geodetic Reference System

WGS-72 1972 World Geodetic System

WGS-66 1966 World Geodetic System

Australian 1965 Used down under

Krassovsky 1940 Used in the Soviet Union

International 1924 Worldwide use

Hayford-1909 1909 Same as the International 1924

Clarke-1880 1880 Most of Africa, France

Clarke-1866 1866 North America, the Phillipines

Airy 1830 Great Britain

Bessel 1841 Central Europe, Chile, Indonesia

Everest 1830 India, Burma, Pakistan, Afghanistan, Thailand, etc.

Sphere 1980 The mean radius in GRS-80 (for spherical/plate tectonics 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 this name as a file and read the ellipsoid name, year, major-axis (in m), minor-axis (in m), and flattening 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.

FRAME_PEN: Thickness of pen used to draw plain map frame in dpi units or points (append p) [5].

FRAME_WIDTH: Width (> 0) of map borders for fancy map frame [0.2c (or 0.075 i)].

GLOBAL_X_SCALE: Global x-scale (> 0) to apply to plot-coordinates before plotting. 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: Size (>= 0) of grid cross at lon-lat intersections. 0 means draw continuous gridlines instead [0].

GRID_PEN: Pen thickness used to draw grid lines in dpi units or points (append p) [1].

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 expansion is done [FALSE].

HEADER_FONT: Font to use when plotting headers. See ANOT_FONT for available fonts [Helvetica].

HEADER_FONT_SIZE: Font size (> 0) for header in points [36].

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].

INTERPOLANT: Determines if linear (linear), Akima's spline (akima), or natural 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 ANOT_FONT for available fonts [Helvetica].

LABEL_FONT_SIZE: Font size (> 0) for labels in points [24].

LINE_STEP: Determines the maximum length (> 0) of individual straight line-segments when drawing arcuate lines [0.025 c (or 0.01i)]

MAP_SCALE_FACTOR: Sets the central scale factor (> 0) used for the Polar Stereographic and Transverse Mercator projections. Typically, it is set to 0.9996 to minimize areal distortion [0.9996].

MAP_SCALE_HEIGHT: Sets the height (> 0) on the map of the map scalebars drawn by various programs [0.2 c (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 definition.

N_COPIES * (-c): Number of plot copies to make [1].

OBLIQUE_ANOTATION: This integer is a sum of 5 bit flags (most of which only are relevant for oblique projections): If bit 1 is set (1), annotations will occur wherever a gridline crosses the map boundaries, else longitudes will be annotated on the lower and upper boundaries only, and latitudes will be annotated on the left and right boundaries only. If bit 2 is set (2), then longitude anotations will be plotted horizontally. If bit 3 is set (4), then latitude anotations will be plotted horizontally. If bit 4 is set (8), then oblique tickmarks are extended to give a projection equal to the specified tick_length. If bit 5 is set (16), tickmarks will be drawn normal to the border regardless of gridline angle. To set a combination of these, add up the values in parentheses. [1].

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

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 is the paper dimension].

PSIMAGE_FORMAT: Determines whether images created in PostScript should use hexadecimal (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 [0.2 c (or 0.075i)].

TICK_PEN: The pen thickness to be used for tickmarks in dpi units or points (append p) [2].

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 [-2 c/-2c (or -0.75i/-0.75 i)].

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].

WANT_EURO_FONT: Determines if GMT PostScript output should include font re-encoding for accented European characters. See Cookbook section 4.16 and Appendix H for details [TRUE].

X_AXIS_LENGTH: Sets the default length (> 0) of the x-axis [25c (or 9 i)].

Y_AXIS_LENGTH: Sets the default length (> 0) of the y-axis [15c (or 6 i)].

X_ORIGIN * (-X): Sets the x-coordinate of the origin on the paper for a new plot [2.5 c (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 [2.5 c (or 1i)]. For an overlay, the default offset is 0.

XY_TOGGLE * (-:): Set if the first two columns of input files contain (latitude,longitude) or (y,x) rather than the expected (longitude,latitude) or (x,y) [FALSE].

Y_AXIS_TYPE: Determines if the annotations for a y-axis (for linear projections) 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 > ~/.gmtdefaults

You may now change the settings by editing this file using a text editor of your choice, or use gmtset to change specified parameters on the command line.

BUGS

If you have typographical errors in your .gmtdefaults file(s), a warning message will be issued, and the GMT defaults for the affected parameters will be used.

gmtdefaults

NAME

SYNOPSIS

DESCRIPTION

GMT PARAMETERS

EXAMPLES

BUGS

SEE ALSO

Recommended readings

Questions & Answers