On 28/03/2013 14:54, Nathan Barber - NOAA Federal wrote:
Background
We generate a precipitation graphic that is based on the mean of an
ensemble of models. Because it goes out 16 days, we can have a wide
variety of amounts...sometimes it can be as little as 2 inches other
times it can be as great as 6 or 7. This variability can cause some
issues with users when our color scale always changes relative to the
amounts. For example Day 1, 1 inch is yellow and 3 inches is
purple....Day 2, 2 inches is yellow and 6 inches is purple.
Is there a way to categorize amounts, say 0-1, 1-2, 2-3, 4-5, 5-6, 7+
so that purple will always represent 7+ and yellow will always be 0-1,
etc...I've looked at the r.colors wiki page but I can't seem to get
the rules to work correctly. I need a consistent color scheme for the
graphic that communicates the level of concern properly to the user.
Any examples would be greatly appreciated...Thanks.
Sure, just create a single rules file (say "standard_precip_colors.txt"
)of the format:
1 yellow
3 orange
5 red
7 blue
100% purple
end
Now apply this rules file to each new precipitation raster with
r.colors map=<new raster> rules=standard_precip_colors.txt
HTH
--
Nathan Barber
Hydrologist
NOAA National Weather Service
Ohio River Forecast Center <http://www.erh.noaa.gov/ohrfc/>
1901 S State Rt 134
Wilmington, OH 45177
(937) 383-0528
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--
Micha Silver
GIS Consulting
052-3665918
http://www.surfaces.co.il
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