[GRASS-user] r.colors

[Nathan Barber - NOAA Federal]

Micha,
          Thanks for the help!


On Thu, Mar 28, 2013 at 9:11 AM, Micha Silver <micha at arava.co.il> wrote:

> 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/<http://www.erh.noaa.gov/ohrfc/>
>> >
>>
>> 1901 S State Rt 134
>> Wilmington, OH  45177
>> (937) 383-0528
>>
>> This mail was received via Mail-SeCure System.
>>
>>
>> ______________________________**_________________
>> grass-user mailing list
>> grass-user at lists.osgeo.org
>> http://lists.osgeo.org/**mailman/listinfo/grass-user<http://lists.osgeo.org/mailman/listinfo/grass-user>
>>
>> This mail was received via Mail-SeCure System.
>>
>>
>>
>
> --
> Micha Silver
> GIS Consulting
> 052-3665918
> http://www.surfaces.co.il
>
>


-- 
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
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/grass-user/attachments/20130328/2a133b49/attachment.html>