我想绘制一堆栅格,并且我创建了一个代码来调整每个节点的断点并将它们绘制到一个for循环中。但是我得到了一个有问题的色彩比例尺,我的努力并没有有效解决这个问题。例如:绘图问题 - 传奇小节刻度,休息时间,图例,小数点
我的降水量范围从0到11.000 ...但大部分数据在0到5.000之间......很少有到11.000。所以我需要改变休息时间来捕捉这种变化...更多的休息时间,我有更多的数据。
然后我为此创建了一个休息对象。
但是,当我绘制光栅,规模彩条变得可怕,很凌乱......
#get predictors (These are a way lighter version of mine)
predictors_full<-getData('worldclim', var='bio', res=10)
predic_legends<-c(
"Annual Mean Temperature [°C*10]",
"Mean Diurnal Range [°C]",
"Isothermality",
"Temperature Seasonality [standard deviation]",
"Max Temperature of Warmest Month [°C*10]",
"Min Temperature of Coldest Month [°C*10]",
"Temperature Annual Range [°C*10]",
"Mean Temperature of Wettest Quarter [°C*10]",
"Mean Temperature of Driest Quarter [°C*10]",
"Mean Temperature of Warmest Quarter [°C*10]",
"Mean Temperature of Coldest Quarter [°C*10]",
"Annual Precipitation [mm/year]",
"Precipitation of Wettest Month [mm/month]",
"Precipitation of Driest Month [mm/month]",
"Precipitation Seasonality [coefficient of variation]",
"Precipitation of Wettest Quarter [mm/quarter]",
"Precipitation of Driest Quarter [mm/quarter]",
"Precipitation of Warmest Quarter [mm/quarter]",
"Precipitation of Coldest Quarter [mm/quarter]",
)
# Crop rasters and rename
xmin=-120; xmax=-35; ymin=-60; ymax=35
limits <- c(xmin, xmax, ymin, ymax)
predictors <- crop(predictors_full,limits)
predictor_names<-c("mT_annual","mT_dayn_rg","Isotherm","T_season",
"maxT_warm_M","minT_cold_M","rT_annual","mT_wet_Q","mT_dry_Q",
"mT_warm_Q","mT_cold_Q","P_annual","P_wet_M","P_dry_M","P_season",
"P_wet_Q","P_dry_Q","P_warm_Q","P_cold_Q")
names(predictors)<-predictor_names
#Set a palette
Blues_up<-c('#fff7fb','#ece7f2','#d0d1e6','#a6bddb','#74a9cf','#3690c0','#0570b0','#045a8d','#023858','#233159')
colfunc_blues<-colorRampPalette(Blues_up)
#Create a loop to plot all my Predictor rasters
for (i in 1:19) {
#save a figure
png(file=paste0(predictor_names[[i]],".png"),units="in", width=12, height=8.5, res=300)
#Define a plot area
par(mar = c(2,2, 3, 3), mfrow = c(1,1))
#extract values from rasters
vmax<- maxValue(predictors[[i]])
vmin<-minValue(predictors[[i]])
vmedn=(maxValue(predictors[[i]])-minValue(predictors[[i]]))/2
#breaks
break1<-c((seq(from=vmin,to= vmedn, length.out = 40)),(seq(from=(vmedn+(vmedn/5)),to=vmax,length.out = 5)))
#plot without the legend because the legend would come out with really messy, with too many marks and uneven spaces
plot(predictors[[i]], col =colfunc_blues(45) , breaks=break1, margin=FALSE,
main =predic_legends[i],legend.shrink=1)
dev.off()
}
的I = 12所有栅格然后写不同的代码,以不同的中断设为色条
#Plot the raster with no color scale bar
plot(predictors[[i]], col =colfunc_blues(45) , breaks=break1, margin=FALSE,
main =predic_legends[i],legend=FALSE)
#breaks for the color scale
def_breaks = seq(vmax,vmin,length.out=(10))
#plot only the legend
image.plot(predictors_full[[i]], zlim = c(vmin,vmax),
legend.only = TRUE, col = colfunc_greys(30),
axis.args = list(at = def_breaks, labels =def_breaks,cex.axis=0.5))
但是,这并不工作,因为颜色不匹配真正在地图上的数字...在每个地图看颜色为6.000 ...这是d ifferent。
如何上进行任何提示? 我是新来的R,所以我很努力达到我的目标...... 另外,我在数字中得到了很多小数位数......如何改变小数点后两位?
编辑:@jbaums教我用日志...我很喜欢,但它没有我所追求
levelplot(predictors[[12]]+1, col.regions=colorRampPalette(brewer.pal(9, 'Blues')), zscaleLog=TRUE, at=seq(1, 4, len=100), margin=FALSE)
你究竟想要它看起来像什么? – jbaums
我不希望沿着数字平均分配的颜色,因为我有很少的数据在高和低的数字,太多在中间......如果他们平均分布,我得到一个几乎没有光和深蓝色的地图,和一切将会是“中等蓝色”,而蓝色变化很少。我想要一个极端的浅蓝色,另一个极端的一个深蓝色,以及确实有数据的数据的其余蓝色。我发布的代码是我尝试这么做的......但上个月我被介绍给编程和R ...我缺乏基础,虽然我一直在阅读很多 – Thai
@jbaums ...你明白这个解释吗?请让我知道如果我不够清楚,我会尽力做得更好!提前感谢您的关注! – Thai