自定义choropleth地图，将州分组为区域

我正在尝试创建一个choropleth地图，基本上将各州划分为销售区域。例如：乔治亚州、佛罗里达州和阿拉巴马州将被视为一个称为东南部的地区

似乎我应该能够使用map_data（“state”）中现有的州形状文件数据来创建具有这些领土的新形状文件

但我不确定该怎么做

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谢谢你们的帮助。让我试着添加一些代码来解释

library(ggplot2)
library(maps)
library(plyr)
library(grid)

#load us state map data
us_state_map = map_data("state");

#map each state to a division
us_state_map$division[us_state_map$region %in% c("connecticut", "maine", "massachusetts", "new hampshire", "rhode island", "vermont")] <- "D1"
us_state_map$division[us_state_map$region %in% c("new jersey","new york","puerto rico","virgin islands")] <- "D2"
us_state_map$division[us_state_map$region %in% c("delaware","district of columbia","maryland","pennsylvania","virginia","west virginia")] <- "D3"
us_state_map$division[us_state_map$region %in% c("alabama","florida","georgia","kentucky","mississippi","north carolina","south carolina","tennessee")] <- "D4"
us_state_map$division[us_state_map$region %in% c("illinois","indiana","michigan","minnesota","ohio","wisconsin")] <- "D5"
us_state_map$division[us_state_map$region %in% c("arkansas","louisiana","new mexico","oklahoma","texas")] <- "D6"
us_state_map$division[us_state_map$region %in% c("iowa","kansas","missouri","nebraska")] <- "D7"
us_state_map$division[us_state_map$region %in% c("colorado","montana","north dakota","south dakota","utah","wyoming")] <- "D8"
us_state_map$division[us_state_map$region %in% c("arizona","california","hawaii","nevada")] <- "D9"
us_state_map$division[us_state_map$region %in% c("alaska","idaho","oregon","washington")] <- "D10"

#create a dummy variable that counts the number of states in each division
divisions.subtotal <- ddply(us_state_map, .(division), summarize, NumberOfStates=length(unique(region)))

#merge our dummy data back into the map data table
us_state_map.mod <- merge(x=us_state_map, y=divisions.subtotal, all.x=TRUE, by.x="division", by.y="division")
us_state_map.mod = arrange(us_state_map.mod, order);
us_state_map.mod$division = as.factor(us_state_map.mod$division)

#plot a map of each division
map <- ggplot() 
map = map + geom_polygon(data=us_state_map.mod, aes(x=long, y=lat, group=group, fill=division))
map

#using these division boundaries, how do i plot the NumberOfStates variable for each Division

库（ggplot2）
图书馆（地图）
图书馆（plyr）
图书馆（网格）
#加载美国州地图数据
美国州地图=地图数据（“州”）；
#将每个州映射到一个分区
美国各州地图$division[美国各州地图$region%在%c（“康涅狄格州”、“缅因州”、“马萨诸塞州”、“新罕布什尔州”、“罗德岛州”、“佛蒙特州”）]不确定您是否还需要答案，但我建议使用地图库：

map("usa")

map("state",regions=c("connecticut", "maine", "massachusetts", 
    "new hampshire", "rhode island","vermont"),interior=F,boundary=T,add=T)

然后使用
col=specifications
为每个区域设置不同级别的阴影。这有点乏味，但它确实创建了区域。
与其修改形状文件，为什么不构建一个函数，根据您的销售区域接收数据框，并根据适合打印的状态输出数据框？您可以使用一个数据框将各州链接到销售区域，并简单地调用
merge
，根据数据的外观，尝试
rgeos:：gUnion
。感谢各位为我指明了正确的方向。我已经添加了一些代码来帮助解释我正在做什么。我不知道是否所有的代码都粘贴了进去-它应该以调用ggplot（）和注释结束。。。