[英]Overlay continent outlines on levelplot in R
我正在嘗試在圖層圖上重疊大陸輪廓,並希望使x和y軸具有經度和緯度值。 目前,我沒有收到錯誤,但沒有輪廓出現。 我想知道是否是因為我沒有正確定義緯度和經度軸?
library(rgdal)
library(rasterVis)
library(RColorBrewer)
library(ncdf4)
library(maptools)
f<-nc_open("cases5.nc")
cases<-ncvar_get(f,"cholera_cases")
sen<-getData('GADM', country='Senegal', level=1)
colr <- colorRampPalette(brewer.pal(11, 'RdYlBu'))
for (i in seq(1,1)){
name<-sprintf("plot_%03d.png",i)
png(name)
print(name)
p<-levelplot(cases,
margin=FALSE, # suppress marginal graphics
colorkey=list(
space='bottom', # plot legend at bottom
labels=list(at=0:10, font=4) # legend ticks and labels
),
par.settings=list(
axis.line=list(col='transparent') # suppress axes and legend outline
),
scales=list(draw=FALSE), # suppress axis labels
col.regions=colr, # colour ramp
at=seq(0, 10, len=101))
+layer(sp.polygons(sen, fill="transparent"))
print(p)
dev.off()
}
此處提供了一個示例netcdf數據文件:
http://clima-dods.ictp.it/Users/tompkins/stackoverflow/cases5.nc
我認為您需要將RasterLayer
對象傳遞給levelplot:
library(rgdal)
library(rasterVis)
library(RColorBrewer)
library(ncdf4)
library(maptools)
library(raster)
r <- raster("/Users/christopher/Downloads/cases5.nc")
colr <- colorRampPalette(brewer.pal(11, 'RdYlBu'))
p <- levelplot(
r,
margin = FALSE,
colorkey = list(space = 'bottom',
labels = list(at = 0:10, font = 4)),
par.settings = list(axis.line = list(col = 'black')),
scales = list(draw = FALSE),
col.regions = colr,
at = seq(0, 10, len = 101)
)
sen <- getData('GADM', country = 'Senegal', level = 1)
p + layer(sp.polygons(sen))
如果要添加經度和緯度,請從代碼中刪除scales = list(draw = FALSE)
。
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