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GMT quick reference

   Instead of an alphabetical listing, this section contains a summary sorted by program purpose. Also included is a quick summary of the standard command line options and a breakdown of the -J option for each of the 25 map projections available in GMT.

FILTERING OF 1-D AND 2-D DATA
blockmean  L2 estimate (x, y, z) data filters/decimators
blocmedian  L1 estimate (x, y, z) data filters/decimators
blockmode  Mode estimate (x, y, z) data filters/decimators
filter1d  Filter 1-D data (time series)
grdfilter  Filter 2-D data in space domain
PLOTTING OF 1-D and 2-D DATA
grdcontour  Contouring of 2-D gridded data
grdimage  Produce images from 2-D gridded data
grdvector  Plot vector fields from 2-D gridded data
grdview  3-D perspective imaging of 2-D gridded data
psbasemap  Create a basemap frame
psclip  Use polygon files as clipping paths
pscoast  Plot coastlines, filled continents, rivers, and political borders
pscontour  Direct contouring or imaging of xyz data by triangulation
pshistogram  Plot a histogram
psimage  Plot Sun rasterfiles on a map
psmask  Create overlay to mask specified regions of a map
psrose  Plot sector or rose diagrams
psscale  Plot grayscale or colorscale
pstext  Plot textstrings
pswiggle  Draw anomalies along track
psxy  Plot symbols, polygons, and lines in 2-D
psxyz  Plot symbols, polygons, and lines in 3-D

GRIDDING OF (X,Y,Z) TABLE DATA
nearneighbor  Nearest-neighbor gridding scheme
surface  Continuous curvature gridding algorithm
triangulate  Perform optimal Delauney triangulation on xyz data
SAMPLING OF 1-D AND 2-D DATA
grdsample  Resample a 2-D gridded data onto new grid
grdtrack  Sampling of 2-D data along 1-D track
sample1d  Resampling of 1-D data
PROJECTION AND MAP-TRANSFORMATION
grdproject  Transform gridded data to a new coordinate system
mapproject  Transform table data to a new coordinate system
project  Project data onto lines or great circles
INFORMATION
gmtdefaults  List the current default settings
gmtset  Command-line editing of parameters in the .gmtdefaults file
grdinfo  Get information about the content of gridded files
minmax  Report extreme values in table data files
MISCELLANEOUS
gmtmath  Reverse Polish Notation (RPN) calculator for table data
makecpt  Create GMT color palette tables
spectrum1d  Compute spectral estimates from time-series
triangulate  Perform optimal Delauney triangulation on xyz data
CONVERT OR EXTRACT SUBSETS OF DATA
gmtconvert  Convert table data from one format to another
gmtselect  Select table data subsets based on multiple spatial criteria
grd2xyz  Convert 2-D gridded data to table data
grdcut  Cut a sub-region from a gridded file
grdpaste  Paste together gridded files along common edge
grdreformat  Convert from one grid format to another
splitxyz  Split (x, y, z) table data into several segments
xyz2grd  Convert table data to 2-D gridded file
DETERMINE TRENDS IN 1-D AND 2-D DATA
fitcircle  Finds best-fitting great or small circles
grdtrend  Fits polynomial trends to gridded files ( z = f(x, y))
trend1d  Fits polynomial or Fourier trends to y = f(x) series
trend2d  Fits polynomial trends to z = f(x, y) series
OTHER OPERATIONS ON 2-D GRIDS
grd2cpt  Make color palette table from gridded file
grdclip  Limit the z-range in gridded data sets
grdedit  Modify grid header information
grdfft  Operate on gridded files in frequency domain
grdgradient  Compute directional gradients from gridded files
grdhisteq  Histogram equalization for gridded files
grdlandmask  Creates mask gridded file from coastline database
grdmask  Set grid nodes in/outside a clip path to constants
grdmath  Reverse Polish Notation (RPN) calculator for gridded files
grdvolume  Calculate volume under a surface within a contour

                                                                                                                                                                                               

STANDARDIZED COMMAND LINE OPTIONS
-B xinfo[ /yinfo[ /zinfo]][ WESNZwesnz+][ :.title:] Tickmarks. Each info is
[ a] tick[ m| c][ f tick[ m| c]][ g tick[ m| c]][ l| p][:"label":][:,"unit":]
-H [n_headers] ASCII tables have header record[s]
-J (upper case for width, lower case for scale) Map projection (see below)
-JA lon0/lat0/width Lambert azimuthal equal area
-JB lon0/lat0/lat1/lat2/width Albers conic equal area
-JC lon0/lat0/width Cassini cylindrical
-JD lon0/lat0/lat1/lat2/width Equidistant conic
-JE lon0/lat0/width Azimuthal equidistant
-JF lon0/lat0/horizon/width Azimuthal Gnomonic
-JG lon0/lat0/width Azimuthal orthographic
-JH lon0/width Hammer equal area
-JI lon0/width Sinusoidal equal area
-JJ lon0/width Miller cylindrical
-JKf lon0/width Eckert IV equal area
-JKs lon0/width Eckert VI equal area
-JL lon0/lat0/lat1/lat2/width Lambert conic conformal
-JMwidth or – -JM lon0/lat0/width Mercator cylindrical
-JN lon0/width Robinson
-JOa lon0/lat0/az/width Oblique Mercator, 1: origin and azimuth
-JOb lon0/lat0/lon1/lat1/width Oblique Mercator, 2: two points
-JOc lon0/lat0/lonp/latp/width Oblique Mercator, 3: origin and pole
-JPwidth[/origin] Polar ($\theta , r$) (or cylindrical)
-JQ lon0/width Equidistant cylindrical (Plate Carrée)
-JR lon0/width Winkel Tripel
-JS lon0/lat0/width General stereographic
-JT lon0/width Transverse Mercator
-JU zone/width Universal Transverse Mercator (UTM)
-JV lon0/width Van der Grinten
-JW lon0/width Mollweide
-JXwidth[ l| p][/height[ l| p]][ d] Linear, log10, and xa-–yb (exponential)
-JY lon0/lats/width General cylindrical equal area
-K Append more PS later
-O This is an overlay plot
-P Select Portrait orientation
-R west/east/south/north[ /zmin/zmax][ r] Specify Region of interest
-U[ /dx/dy/][ label] Plot time-stamp on plot
-V Run in verbose mode
-X[ a] off Shift plot origin in x-direction
-Y[ a] off Shift plot origin in y-direction
–– -c copies Set number of plot copies [1]
-: Expect y/ x input rather than x/ y

                                                                                                                                                                                               

 


next up previous contents index
Next: General features Up: GMT overview and quick Previous: GMT summary
Paul Wessel
1999-12-03