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Version 3.1 of the Generic Mapping Tools (GMT) has been released. More than 6000 scientists worldwide are currently using this free, public domain collection of UNIX tools that contains programs serving a variety of research functions. GMT allows users to manipulate (x,y) and (x,y,z) data, and generate PostScript illustrations, including simple x‐y diagrams, contour maps, color images, and artificially illuminated, perspective, and/or shaded‐relief plots using a variety of map projections (see Wessel and Smith 1991 and Wessel and Smith 1995, for details.). GMT has been installed under UNIX on most types of workstations and both IBM‐compatible and Macintosh personal computers.
Wessel et al. (Tue,) studied this question.
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