R help - Dec 2012 - create a color palette with custom ranges between colors

Hello everybody,

I'm trying to create my own color palette on R, in order to interpolate some
different temperature data on different maps (daily means, seasonal
means,...).

I would like to create a color palette which works for each map, so I need a
color palette between -40 and +40?C. Sometimes my data for one map range
from -10 to +20, sometimes from 10 to 30, etc... but always between -40 and
+40?C.

I would like a fluent color gradation between my extremas (-40 and +40),
with different colors between customed values.

For example, if the temperature is under -20?C I would like the color
"darkblue", then if the temperature is between -20 and 0?C I would
like the
color "lightblue", then between 0 and 20?C the color
"yellow" and finally
over 20?C the color "red".

Is it possible to create a fluent gradation color palette with customed
colors (not just one color for each part, but something fluent based on the
chosen colors) ?
Something like this: http://i.stack.imgur.com/5NoJh.jpg

I would like then to join this customed color palette to all my
"levelplot"
or "image.plot" functions,in order to create all my maps.

Any help for doing this would be very much appreciated!

Thanks a lot!







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Hello

Package 'RColorBrewer' + function 'colorRampPalette'

or

?two.colors

HTH
Pascal


Le 12/12/12 21:00, jeff6868 a ?crit :
> Hello everybody,
>
> I'm trying to create my own color palette on R, in order to interpolate
some
> different temperature data on different maps (daily means, seasonal
> means,...).
>
> I would like to create a color palette which works for each map, so I need
a
> color palette between -40 and +40?C. Sometimes my data for one map range
> from -10 to +20, sometimes from 10 to 30, etc... but always between -40 and
> +40?C.
>
> I would like a fluent color gradation between my extremas (-40 and +40),
> with different colors between customed values.
>
> For example, if the temperature is under -20?C I would like the color
> "darkblue", then if the temperature is between -20 and 0?C I
would like the
> color "lightblue", then between 0 and 20?C the color
"yellow" and finally
> over 20?C the color "red".
>
> Is it possible to create a fluent gradation color palette with customed
> colors (not just one color for each part, but something fluent based on the
> chosen colors) ?
> Something like this: http://i.stack.imgur.com/5NoJh.jpg
>
> I would like then to join this customed color palette to all my
"levelplot"
> or "image.plot" functions,in order to create all my maps.
>
> Any help for doing this would be very much appreciated!
>
> Thanks a lot!
>
>
>
>
>
>
>
> --
> View this message in context:
http://r.789695.n4.nabble.com/create-a-color-palette-with-custom-ranges-between-colors-tp4652875.html
> Sent from the R help mailing list archive at Nabble.com.
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>

Would this accomplish what you're trying to do?
http://www.r-bloggers.com/define-intermediate-color-steps-for-colorramppalette/

Or some combination of ?colorRampPalette and ?cut or classIntervals() from
package classInt.



On Wed, Dec 12, 2012 at 7:00 AM, jeff6868
<geoffrey_klein@etu.u-bourgogne.fr
> wrote:
> Hello everybody,
>
> I'm trying to create my own color palette on R, in order to interpolate
> some
> different temperature data on different maps (daily means, seasonal
> means,...).
>
> I would like to create a color palette which works for each map, so I need
> a
> color palette between -40 and +40°C. Sometimes my data for one map range
> from -10 to +20, sometimes from 10 to 30, etc... but always between -40 and
> +40°C.
>
> I would like a fluent color gradation between my extremas (-40 and +40),
> with different colors between customed values.
>
> For example, if the temperature is under -20°C I would like the color
> "darkblue", then if the temperature is between -20 and 0°C I
would like the
> color "lightblue", then between 0 and 20°C the color
"yellow" and finally
> over 20°C the color "red".
>
> Is it possible to create a fluent gradation color palette with customed
> colors (not just one color for each part, but something fluent based on the
> chosen colors) ?
> Something like this: http://i.stack.imgur.com/5NoJh.jpg
>
> I would like then to join this customed color palette to all my
"levelplot"
> or "image.plot" functions,in order to create all my maps.
>
> Any help for doing this would be very much appreciated!
>
> Thanks a lot!
>
>
>
>
>
>
>
> --
> View this message in context:
>
http://r.789695.n4.nabble.com/create-a-color-palette-with-custom-ranges-between-colors-tp4652875.html
> Sent from the R help mailing list archive at Nabble.com.
>
> ______________________________________________
> R-help@r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>


-- 
Nicole K.S. Barker
Ph.D Student / Étudiante au Doctorat, Université Laval
Faculté de foresterie, de géographie et de géomatique
2405, rue de la Terrasse, bureau 2107, Québec (QC), G1V 0A6
Tél. 418-656-2131 ext 6110

Ducks Unlimited Canada / Canards Illimités Canada
710 Bouvier, bureau 260, Québec (QC), G2J 1C2
Tél. (418) 623-1650 ext 37; Fax (418) 623-0420

	[[alternative HTML version deleted]]

Thank you Nicole!

I did it with the "color.palette" function in the link you gave me.
I added then in my levelplot function a sequence with "at":

at=seq(-40,40,1)

And it works quite good. 

Thanks again Nicole.

Merci ? toi aussi pascal, et vive le CRC ainsi que le grand C..... C..... !
;)





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