[GRASS-dev] Descriptions for r.colors color rules

[Patton, Eric]

Helena:
>> curvature is for terrain curvatures (based on the color table that  
>> you get for curvatures
>> from v.surf.rst and r.slope.aspect), something like this
>> http://skagit.meas.ncsu.edu/~helena/wrriwork/lakewh/honpc.jpg
>> http://www.grassbook.org/gallery/chapters/s060806f010_pcurv.jpg
>> http://www.grassbook.org/gallery/chapters/s0609f020_topoanal.jpg
>> 
>> negative values are blues, positive values are yellow to red (I will 
>> double check that to make sure).
>> Generally it is useful for maps that have both positive
>> and negative values.

Hamish:
>see also r.colors.stddev from the wiki addons page. To me it is a very
>interesting module for setting color tables for difference maps etc.

Neat, I'll have to check this one out.

Helena:
>> I don't know about evi,

Hamish:
>It is enhanced vegetation index from eg MODIS data like NDVI.
>see  http://earthobservatory.nasa.gov/Library/MeasuringVegetation/

Thanks to all for the info; I've updated the color rules list and added some descriptions. 
I've been having trouble with svn today (see my other thread from today), but the commit 
seems to have made it through on Trac.

~ Eric.