[GRASS-dev] [GRASS GIS] #2714: wish: logarithmic legend for raster maps

GRASS GIS trac at osgeo.org
Thu Jun 23 04:56:44 PDT 2016

#2714: wish: logarithmic legend for raster maps
  Reporter:  veroandreo   |      Owner:  grass-dev@…
      Type:  enhancement  |     Status:  new
  Priority:  normal       |  Milestone:  7.0.5
 Component:  Display      |    Version:  svn-releasebranch70
Resolution:               |   Keywords:  d.legend, gsoc2016, cartography
       CPU:  x86-64       |   Platform:  All

Comment (by veroandreo):

 Replying to [comment:11 lazaa]:
 > Thanks for real data, it was much easier find the mistake. It gives
 better results now.

 Yes, it is better indeed. But check how the scale for chlorophyll proposed
 by NASA looks like (and how a logarithmic scale looks like in general):

 Values should be equally spaced, "graphically" speaking (for example:
 0.01, 0.03, 0.1, 0.3, 1.0, 3.0, 10.0) and therefore more space in the
 color palette is needed for lower values, i.e.: more space for "blues"
 "cyans" and "greens" in your example (there's still a lot of red).

 > ...
 > but maybe I should add new option so user can determine how many digits

 This could be useful in general :)

Ticket URL: <https://trac.osgeo.org/grass/ticket/2714#comment:13>
GRASS GIS <https://grass.osgeo.org>

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