固定颜色的特定值 [英] Fixed color for specific value

问题描述

实际上我有这个：

我试图制作一个温度图，一切正常，但我不知道如何有一个固定的调色板。 / p>

  rgb.palette<  -  colorRampPalette（c（blue，green，yellow，orange red），
 space =Lab）
 
 image.plot（akima.smooth，
 col = rgb.palette（NBR.COLORS），
 main = main_title，
 horizo​​ntal = TRUE，
 axes = TRUE）
  

工作，但被绘的颜色总是从蓝色到红色。

例如，如果地图上的最低温度为-10°C，颜色将为蓝色，但在另一张地图中，如果最低温度为+ 25°C

 
 
 $ b 
 code> -30°C => blue 
 -20°C =>浅蓝色
 -10℃=>深绿色
 0℃=>绿色
 10°C =>黄色
  

如果在地图1最低温度是-20我想要浅蓝色最低温度为10°CI想要黄色的颜色。

解决方案

我使用这个解决方案：

  col = colorRampPalette（c（darkmagenta，blue，green，yellow，orange，red），
 space =Lab）（NBR.COLORS）
 breaks = c（seq（-35,10，length.out = NBR.COLORS / 2），10，
 seq（10， length.out = NBR.COLORS / 2））
 image.plot（akima.smooth，col = col，breaks = breaks，main = main_title，
 horizo​​ntal = TRUE，axes = TRUE）; 
  

I am trying to make a temperature map, all works fine but I don't know how to have a fixed color palette.

Actually I have this :

rgb.palette <- colorRampPalette(c("blue","green","yellow","orange","red"), 
                                space = "Lab")

image.plot(akima.smooth, 
           col = rgb.palette(NBR.COLORS), 
           main=main_title, 
           horizontal=TRUE,
           axes=TRUE)

This solution works but the colors which are painted are always from blue to red.

For example if the lowest temperature on the map is -10°C the color will be blue, but in another map if the lowest temperature is +25°C that color will be blue too.

How can I define a fixed color panel such as :

-30°C => blue
-20°C => light blue
-10°C => dark green
  0°C => green
 10°C => yellow

If in map 1 lowest temperature is -20 I want "light blue" and in map 2 if lowest temperature is 10°C I want "yellow" color.

解决方案

I used this solution :

col = colorRampPalette(c("darkmagenta","blue","green","yellow","orange","red"),
                       space="Lab")(NBR.COLORS) 
breaks = c(seq(-35, 10, length.out=NBR.COLORS/2), 10, 
           seq(10, 35, length.out=NBR.COLORS/2))
image.plot(akima.smooth, col=col, breaks=breaks, main=main_title,
           horizontal=TRUE,axes=TRUE);

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