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Exports <i>G3D</i> grids to <i>v5d</i> format. <i>map</i> is a valid G3D
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grid in the current mapset. <i>output</i> is the name of a v5d file which
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will be written in the current working directory. <a href="http://www.ssec.wisc.edu/~billh/vis5d.html">VIS5D</a>
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such as those produced by numerical weather models. One can make isosurfaces,
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contour line slices, colored slices, volume renderings, etc of data in
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a feature for wind trajectory tracing, a way to make text anotations for
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publications, support for interactive data analysis, etc.