## GMT Online Man Pages

These man pages are html-versions of the Unix man pages for GMT. They are grouped both alphabetically or by function.

### Thematic listing of GMT Unix man pages

For alphabetical order, click here.

### GMT WRAPPER:

- GMT A Wrapper for GMT programs

### FILTERING OF 1-D AND 2-D DATA:

- blockmean L2 (x,y,z) data filter/decimator
- blockmedian L1 (x,y,z) data filter/decimator
- blockmode Mode-estimating (x,y,z) data filter/decimator
- 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 datar
- 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
- pslegend Plot legend 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) DATA:

- greenspline Gridding using Green's function splines
- 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 Project gridded data onto new coordinate system
- mapproject Transformation of coordinate systems
- project Project data onto lines/great circles

### INFORMATION:

- gmtcolors Information on how to specify colors in GMT
- gmtdefaults List the current default settings
- gmtset Edit parameters in the .gmtdefaults file
- grdinfo Get information about grd files
- minmax Report extreme values in table datafiles

### CONVERT OR EXTRACT SUBSETS OF DATA:

- gmt2rgb Convert Sun raster or grdfile to red, green, blue component grids
- gmtconvert Convert table data from one format to another
- gmtmath Reverse Polish calculator for table data
- gmtselect Select table subsets based on multiple spatial criteria
- grd2xyz Convert 2-D gridded data to table
- grdcut Cut a sub-region from a grd file
- grdpaste Paste together grdfiles along common edge
- grdreformat Convert from one grdformat to another
- splitxyz Split xyz files into several segments
- xyz2grd Convert table to 2-D grd file

### MISCELLANEOUS:

- makecpt Create GMT color palette tables
- spectrum1d Compute spectral estimates from time-series
- triangulate Perform optimal Delauney triangulation on xyz data

### DETERMINE TRENDS IN 1-D AND 2-D DATA:

- fitcircle Finds best-fitting great or small circles
- grdtrend Fits polynomial trends to grdfiles (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 grdfile
- grdblend Blend several gridded data sets into one
- grdclip Limit the z-range in gridded data sets
- grdedit Modify grd header information
- grdfft Operate on grdfiles in frequency domain
- grdgradient Compute directional gradient from grdfiles
- grdhisteq Histogram equalization for grdfiles
- grdlandmask Creates mask grdfile from coastline database
- grdmask Set nodes outside a clip path to a constant
- grdmath Reverse Polish calculator for grdfiles
- grdvolume Calculating volume under a surface within a contour

### MANIPULATION OF GMT POSTSCRIPT FILES:

- ps2raster Crop and convert PostScript to raster image, EPS and PDF

### POSTSCRIPT LIBRARY FUNCTION CALLS (for developers):

- pslib Reference manual for libpsl.a

### Alphabetical listing of GMT Unix man pages

For a thematic listing, click here.

1. blockmean L2 (x,y,z) data filter/decimator
2. blockmedian L1 (x,y,z) data filter/decimator
3. blockmode Mode-estimating (x,y,z) data filter/decimator
4. filter1d Filter 1-D data (time series)
5. fitcircle Finds best-fitting great or small circles
6. gmt2rgb Convert Sun raster or grdfile to red, green, blue component grids
7. gmtcolors Information on how to specify colors in GMT
8. gmtconvert Convert table data from one format to another
9. gmtdefaults List the current default settings
10. gmtmath Reverse Polish calculator for table data
11. gmtselect Select table subsets based on multiple spatial criteria
12. gmtset Edit parameters in the .gmtdefaults file
13. grd2cpt Make color palette table from grdfile
14. grd2xyz Convert 2-D gridded data to table
15. grdblend Blend several gridded data sets into one
16. grdclip Limit the z-range in gridded data sets
17. grdcontour Contouring of 2-D gridded data
18. grdcut Cut a sub-region from a grd file
19. grdedit Modify grd header information
20. grdfft Operate on grdfiles in frequency domain
21. grdfilter Filter 2-D data in space domain
22. grdgradient Compute directional gradient from grdfiles
23. grdhisteq Histogram equalization for grdfiles
24. grdimage Produce images from 2-D gridded datar
25. grdinfo Get information about grd files
26. grdlandmask Creates mask grdfile from coastline database
27. grdmask Set nodes outside a clip path to a constant
28. grdmath Reverse Polish calculator for grdfiles
29. grdpaste Paste together grdfiles along common edge
30. grdproject Project gridded data onto new coordinate system
31. grdreformat Convert from one grdformat to another
32. grdsample Resample a 2-D gridded data onto new grid
33. grdtrack Sampling of 2-D data along 1-D track
34. grdtrend Fits polynomial trends to grdfiles (z = f(x,y))
35. grdvector Plot vector fields from 2-D gridded data
36. grdview 3-D perspective imaging of 2-D gridded data
37. grdvolume Calculating volume under a surface within a contour
38. greenspline Gridding using Green's function splines
39. makecpt Create GMT color palette tables
40. mapproject Transformation of coordinate systems
41. minmax Report extreme values in table datafiles
42. nearneighbor Nearest-neighbor gridding scheme
43. project Project data onto lines/great circles
44. ps2raster Crop and convert PostScript to raster image, EPS and PDF
45. psbasemap Create a basemap frame
46. psclip Use polygon files as clipping paths
47. pscoast Plot coastlines, filled continents, rivers, and political borders
48. pscontour Direct contouring or imaging of xyz-data by triangulation
49. pshistogram Plot a histogram
50. psimage Plot Sun rasterfiles on a map
51. pslegend Plot legend on a map
52. psmask Create overlay to mask specified regions of a map
53. psrose Plot sector or rose diagrams
54. psscale Plot grayscale or colorscale
55. pstext Plot textstrings
56. pswiggle Draw anomalies along track
57. psxy Plot symbols, polygons, and lines in 2-D
58. psxyz Plot symbols, polygons, and lines in 3-D
59. sample1d Resampling of 1-D data
60. spectrum1d Compute spectral estimates from time-series
61. splitxyz Split xyz files into several segments
62. surface Continuous curvature gridding algorithm
63. trend1d Fits polynomial or Fourier trends to y = f(x) series
64. trend2d Fits polynomial trends to z = f(x,y) series
65. triangulate Perform optimal Delauney triangulation on xyz data
66. triangulate Perform optimal Delauney triangulation on xyz data
67. xyz2grd Convert table to 2-D grd file

For a thematic listing of GMT man pages, click here. Return to GMT Online Services page.