# GMT Online Man Pages

These man pages are html-versions of the Unix man pages for GMT. They are grouped by function. For an alphabetical order, click here.

## Thematic listing of GMT Unix man pages

### 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
- 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:

- 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
- 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

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

- pslib Reference manual for libpsl.a

## Alphabetical listing of GMT Unix man pages

1. blockmean
2. blockmedian
3. blockmode
4. filter1d
5. fitcircle
6. gmtconvert
7. gmtdefaults
8. gmtmath
9. gmtselect
10. gmtset
11. grd2cpt
12. grd2xyz
13. grdclip
14. grdcontour
15. grdcut
16. grdedit
17. grdfft
18. grdfilter
19. grdgradient
20. grdhisteq
21. grdimage
22. grdinfo
23. grdlandmask
24. grdmask
25. grdmath
26. grdpaste
27. grdproject
28. grdreformat
29. grdsample
30. grdtrack
31. grdtrend
32. grdvector
33. grdview
34. grdvolume
35. makecpt
36. mapproject
37. minmax
38. nearneighbor
39. project
40. psbasemap
41. psclip
42. pscoast
43. pscontour
44. pshistogram
45. psimage
46. psmask
47. psrose
48. psscale
49. pstext
50. pswiggle
51. psxy
52. psxyz
53. sample1d
54. spectrum1d
55. splitxyz
56. surface
57. trend1d
58. trend2d
59. triangulate
60. xyz2grd
61. gmt

For a thematic listing of GMT man pages, click here.

Return to GMT Online Services page.