#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 lazaa):
Replying to [comment:13 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).
You're right, I used wrong formula to calculate the scale.
>
> > ...
> >
> > 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:14>
GRASS GIS <https://grass.osgeo.org>