## 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:

- 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:

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

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