R 世界地图-将一半国家映射为不同颜色
我在这里用这个例子进行讨论:R 世界地图-将一半国家映射为不同颜色,r,map,ggplot2,R,Map,Ggplot2,我在这里用这个例子进行讨论: 库(rgdal) 图书馆(GG2) 图书馆(地图工具) #数据来自http://thematicmapping.org/downloads/world_borders.php. #直接链接:http://thematicmapping.org/downloads/TM_WORLD_BORDERS_SIMPL-0.3.zip #解包并将文件放入目录“数据” gpclibPermit() world.map这是一个没有ggplot的解决方案,它依赖于plot函数。除了
库(rgdal)
图书馆(GG2)
图书馆(地图工具)
#数据来自http://thematicmapping.org/downloads/world_borders.php.
#直接链接:http://thematicmapping.org/downloads/TM_WORLD_BORDERS_SIMPL-0.3.zip
#解包并将文件放入目录“数据”
gpclibPermit()
world.map这是一个没有ggplot
的解决方案,它依赖于plot
函数。除了OP中的代码外,它还需要rgeos
包:
编辑现在视觉疼痛减轻10%
编辑2现在东半部和西半部具有质心
library(rgeos)
library(RColorBrewer)
# Get centroids of countries
theCents <- coordinates(world.map)
# extract the polygons objects
pl <- slot(world.map, "polygons")
# Create square polygons that cover the east (left) half of each country's bbox
lpolys <- lapply(seq_along(pl), function(x) {
lbox <- bbox(pl[[x]])
lbox[1, 2] <- theCents[x, 1]
Polygon(expand.grid(lbox[1,], lbox[2,])[c(1,3,4,2,1),])
})
# Slightly different data handling
wmRN <- row.names(world.map)
n <- nrow(world.map@data)
world.map@data[, c("growth", "category")] <- list(growth = 4*runif(n),
category = factor(sample(1:5, n, replace=TRUE)))
# Determine the intersection of each country with the respective "left polygon"
lPolys <- lapply(seq_along(lpolys), function(x) {
curLPol <- SpatialPolygons(list(Polygons(lpolys[x], wmRN[x])),
proj4string=CRS(proj4string(world.map)))
curPl <- SpatialPolygons(pl[x], proj4string=CRS(proj4string(world.map)))
theInt <- gIntersection(curLPol, curPl, id = wmRN[x])
theInt
})
# Create a SpatialPolygonDataFrame of the intersections
lSPDF <- SpatialPolygonsDataFrame(SpatialPolygons(unlist(lapply(lPolys,
slot, "polygons")), proj4string = CRS(proj4string(world.map))),
world.map@data)
##########
## EDIT ##
##########
# Create a slightly less harsh color set
s_growth <- scale(world.map@data$growth,
center = min(world.map@data$growth), scale = max(world.map@data$growth))
growthRGB <- colorRamp(c("red", "blue"))(s_growth)
growthCols <- apply(growthRGB, 1, function(x) rgb(x[1], x[2], x[3],
maxColorValue = 255))
catCols <- brewer.pal(nlevels(lSPDF@data$category), "Pastel2")
# and plot
plot(world.map, col = growthCols, bg = "grey90")
plot(lSPDF, col = catCols[lSPDF@data$category], add = TRUE)
可通过以类似方式创建rSPDF
对象来获得西半部(“右”)的对象:
# Create square polygons that cover west (right) half of each country's bbox
rpolys <- lapply(seq_along(pl), function(x) {
rbox <- bbox(pl[[x]])
rbox[1, 1] <- theCents[x, 1]
Polygon(expand.grid(rbox[1,], rbox[2,])[c(1,3,4,2,1),])
})
# Determine the intersection of each country with the respective "right polygon"
rPolys <- lapply(seq_along(rpolys), function(x) {
curRPol <- SpatialPolygons(list(Polygons(rpolys[x], wmRN[x])),
proj4string=CRS(proj4string(world.map)))
curPl <- SpatialPolygons(pl[x], proj4string=CRS(proj4string(world.map)))
theInt <- gIntersection(curRPol, curPl, id = wmRN[x])
theInt
})
# Create a SpatialPolygonDataFrame of the western (right) intersections
rSPDF <- SpatialPolygonsDataFrame(SpatialPolygons(unlist(lapply(rPolys,
slot, "polygons")), proj4string = CRS(proj4string(world.map))),
world.map@data)
你可能会考虑并列两张地图。可能比这个国家分裂更直观。@Marcinebox谢谢你的建议。谢谢你的回答(和更新)。如果我遵循以下网站上的建议,这是否允许我结合您所做的工作(除了ggplot2)@XuWang,您应该能够使用链接的说明绘制lSPDF
和rSPDF
形状文件,但是如果您希望每个半部分都有不同的fill
映射,那么您可能会遇到问题。
coordinates(lSPDF)
# Create square polygons that cover west (right) half of each country's bbox
rpolys <- lapply(seq_along(pl), function(x) {
rbox <- bbox(pl[[x]])
rbox[1, 1] <- theCents[x, 1]
Polygon(expand.grid(rbox[1,], rbox[2,])[c(1,3,4,2,1),])
})
# Determine the intersection of each country with the respective "right polygon"
rPolys <- lapply(seq_along(rpolys), function(x) {
curRPol <- SpatialPolygons(list(Polygons(rpolys[x], wmRN[x])),
proj4string=CRS(proj4string(world.map)))
curPl <- SpatialPolygons(pl[x], proj4string=CRS(proj4string(world.map)))
theInt <- gIntersection(curRPol, curPl, id = wmRN[x])
theInt
})
# Create a SpatialPolygonDataFrame of the western (right) intersections
rSPDF <- SpatialPolygonsDataFrame(SpatialPolygons(unlist(lapply(rPolys,
slot, "polygons")), proj4string = CRS(proj4string(world.map))),
world.map@data)
points(coordinates(rSPDF), col = factor(rSPDF@data$REGION))
# or
text(coordinates(lSPDF), labels = lSPDF@data$FIPS, cex = .7)