[英]How to change the scale color of the legend of raster ggplot2 R
I want to expose my problem, in order to give me some ways forward. 我想揭露我的问题,以便给我一些解决方法。 My goal is to display a card with my full raster from this program :
我的目标是在此程序中显示带有完整栅格的卡片:
library(raster) ; library(rgdal) ; library(sp);library(rgeos);library(ggplot2)
alti=raster("raster.tif")
hdf <- rasterToPoints(alti)
hdf <- data.frame(hdf)
colnames(hdf) <- c("Long","Lat","Altitude")
ggplot()+
layer(geom="raster",data=hdf,mapping=aes(Long,Lat,fill=Altitude))+
# draw boundaries
geom_path(color="black", linestyle=0.2)+
scale_fill_gradientn(name="A",colours=c("red","blue","green","grey","yellow","orange","black"), breaks=c(0,100,200,500,750,1000,2000))
At the end, I can not to adjust colors of my legend with ranges of value I have proposed. 最后,我无法使用我建议的值范围来调整图例的颜色。
I want to have this legend : 我想要这个传说:
red : 0-100.
blue : 100-200.
green : 200-500.
grey : 500-750.
yellow : 750-1000.
orange : 1000-2000.
black : upper 2000.
example: normally for the range [1000-2000]
it's orange
, but in my result on the legend there are 3 colors grey
, yellow
and orange
. 例如:通常在
[1000-2000]
范围内,它是orange
,但是在图例中,我的结果是grey
, yellow
和orange
3种颜色。 I want the limits of my intervals should correspond to the value limits of the colors in the legend. 我希望间隔的限制应与图例中颜色的值限制相对应。
If you create a factor variable from your Altitude column and use scale_fill_manual()
, you can get it to work properly. 如果您从“高度”列中创建一个因子变量并使用
scale_fill_manual()
,则可以使其正常运行。 It will also create nice labels for your legend automatically: 它还将自动为您的图例创建漂亮的标签:
library(raster) ; library(rgdal) ; library(sp);library(rgeos);library(ggplot2)
alti=raster("raster.tif")
hdf <- rasterToPoints(alti)
hdf <- data.frame(hdf)
colnames(hdf) <- c("Long","Lat","Altitude")
tmp <- hdf$Altitude
hdf$Altitude <- ifelse(tmp <= 100, "0-100", hdf$Altitude)
hdf$Altitude <- ifelse(tmp > 100 & tmp <= 200, "100-200", hdf$Altitude)
hdf$Altitude <- ifelse(tmp > 200 & tmp <= 500, "200-500", hdf$Altitude)
hdf$Altitude <- ifelse(tmp > 500 & tmp <= 750, "500-750", hdf$Altitude)
hdf$Altitude <- ifelse(tmp > 750 & tmp <= 1000, "750-1000", hdf$Altitude)
hdf$Altitude <- ifelse(tmp > 1000 & tmp <= 2000, "1000-2000", hdf$Altitude)
hdf$Altitude <- ifelse(tmp > 2000, "Upper 2000", hdf$Altitude)
hdf$Altitude <- factor(hdf$Altitude)
g <- ggplot()+
layer(geom="raster",data=hdf,mapping=aes(Long,Lat,fill=Altitude))+
# draw boundaries
geom_path(color="black", linestyle=0.2)+
scale_fill_manual(values = c("red","blue","green","grey","yellow","orange","black"))
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