#2714: wish: logarithmic legend for raster maps
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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
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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):
http://oceancolor.gsfc.nasa.gov/images/CHL_chlor_a_colorscale.png
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
display?
This could be useful in general 
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Ticket URL: <https://trac.osgeo.org/grass/ticket/2714#comment:13>
GRASS GIS <https://grass.osgeo.org>