Using the occasion of #2522 [1] (BTW I agree with these changes), I would like to launch a discussion on the future of thematic mapping in GRASS (post grass7). I think we need a general discussion about what exactly is still needed. Several elements were included directly into d.vect (variable size of symbols and widths of lines, width-, size- and rgb-column). I actually think that maybe a more efficient approach in the long run might be to use these elements for thematic mapping of vectors. Something like this:

* use v.class to define classes; extend to allow writing class attribution to attribute table * use an extended v.colors or a new v.colors.classes to define colors for classes, possibly using [2]
 * use d.vect to display all of this
* use a new d.legend.vector to display legend info (including class frequencies).

Python scripts could be used to bind these modules together.

What do you think ?

Moritz


[1] http://trac.osgeo.org/grass/ticket/2522
[2] http://colorbrewer2.org/
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