| OpendTect User Documentation version 4.2 |
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GMT (Generic Mapping Tools) is an open source collection of more than 60 tools for manipulating Geographic and Cartesian data sets. It can produce Encapsulated Postscript File illustrations ranging from simple x-y plots, via contour maps, to artificially illuminated surfaces and 3D perspectives views. OpendTect supports an open source plugin that uses GMT tools to create scaled maps.
For more details please visit the official GMT website at: http://gmt.soest.hawaii.edu/
To launch GMT tools, click on the icon 
in the OpendTect main toolbar. The first time you launch the GMT mapping tools, a warning message will pop up, if GMT is not already installed on your computer. This can be downloaded from their web site: http://gmt.soest.hawaii.edu/
After successful installation of the package, the GMT user interface will be launched:
GMT User Interface
Several tabs have been arranged to specify the respective settings. In the later part of this section, a typical OpendTect example of a postscript map will be shown.
- Basemap: This tab is used to set the scale of the map and other map settings.
- Contours: It is used to make a horizon contour map.
- Faults: It is used to post the intersection of faults with constant times or the intersection with a surface.
- Wells: It is used to post wells in the map.
- Locations: It is used to post pickset data in the map overlay.
- Polyline: It is used to add polygons (e.g. lease boundaries) in the map overlay.
- Random Lines: It is used to post Random Line(s) in the map.
- 2D Lines: It is used to post 2D-Line(s) in the map.
- Coastline: This tab is generally used to draw coastal lines.
- Advanced: It is used to use customized GMT commands.
Basemap settings
In Basemap tab, specify:
1- Map Title
2- Set survey ranges (according to OpendTect survey)
3- The ranges can be Reset to Survey box
4- Set the Scale
5- Toggle Draw Gridlines
6- Optionally you can also add Remarks.
7- Write appropriate disk location for the output file in the Select output file field and press Create Map button.
Create a Contour Map
In Contour Map tab, specify:
1- Select OpendTect Horizon(s)
2- Sub-select the area (optional), Press Read Horizon button
3- The number of contour will be computed. You may change the number of steps.
4- Edit the settings (draw, fill, line styles etc)
5- Press Add button... the selected 2D Lineset(s) will appear on left Map overlays panel.
Insert faults
Insert Wells location
In Wells tab, specify:
1- Select OpendTect Wells
2- Edit the settings (symbols, size, color etc)
3- Press Add button... the selected Wells will appear on left Map overlays panel.
Insert locations
Create a Polyline
In Polyline tab, specify:
1- Select Polygon
2- Name of Polygons
3- Settings (symbols, size, color etc)
4- Press Add button... the selected Polygon will appear on left Map overlays panel.
5- Write appropriate disk location for the output file in the Select output file field and press Create Map button.
Caution: If you make changes in the settings, always click Replace before creating map.
Insert random lines
Insert 2D lines
In 2D Lines tab, specify:
1- Select OpendTect 2D Lineset(s)
2- Name the Lineset(s)
3- Edit the settings (symbols, size, color etc)
4- Press Add button... the selected 2D Lineset(s) will appear on left Map overlays panel.
Insert coastline
Insert advanced commands
Typical output:
