[GRASS-user] logarithmic scale in raster legend

[Daniel Victoria]

What if you use r.mapcalc and apply log to your map to make a new one with
rescaled values?
On Jun 9, 2014 12:36 PM, "Veronica Andreo" <veroandreo at gmail.com> wrote:

> Hi list!
>
> I have these raster maps of chlorophyll concentration (mg/m3) with a lot
> of very small values (from 0.02 to 1.5) and few high values (between 20 and
> 100)... I managed to create my own color table to get a good visualization
> of the variation... but when I display the legend, i loose the color
> variation in smaller values...
>
> Is it possible to create a logarithmic legend or at least determine which
> tick-marks I'm interested in?? I've tried with "use" parameter in d.legend
> (which seemed to meet my needs) setting it to: 0.01,0.1,1,10,100, but works
> only for categories... There's no such a thing in ps.map, either... which
> would be the right approach? any ideas?
>
> Thanks much in advance!
> Best,
>
> Vero
>
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