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GMT programs can accept dimensional quantities in cm, inch,
meter, or point (1/72 of an inch)4.1. There are two ways to ensure that GMT understands
which unit you intend to use.
- Append the desired unit to the dimension you supply. This
way is explicit and clearly communicates what you intend, e.g.,
-X4c means 4 cm.
- Set the parameter MEASURE_UNIT to the desired unit. Then, all
dimensions without explicit unit will be interpreted accordingly.
The latter method is less secure as other users may have a different unit
set and your script may not work as intended. We therefore recommend
you always supply the desired unit explicitly.
Next: 4.2 GMT defaults
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Paul Wessel
2004-10-01