我正在尝试 R 制图包。不得不努力找到一个想要处理制图的美国州 shapefile - 许多似乎太大了,等等。我似乎让一切顺利,但科罗拉多州的错误情节。
library(cartography)
library(sf)
library(RColorBrewer)
library(maps)
library(ggplot2)
rm(list = ls())
# USA shape file
states <- st_as_sf(map("state", plot = F, fill = TRUE))
#seems to plot correctly here
#ggplot(states) + geom_sf(aes(fill = ID))
usa <- st_transform(states,
CRS("+proj=aea +lat_1=29.5 +lat_2=45.5 +lat_0=37.5 +lon_0=-96"))
# still seems to plot fine
#ggplot(usa) + geom_sf(aes(fill = ID))
usa <- st_buffer(usa, dist=0)
datamap <- usa
datamap$randoVar <- sample(1:3, length(datamap$ID), replace = T)
datamap_pencil <- getPencilLayer(
x = datamap,
buffer = 500,
size = 400,
lefthanded = F
)
plot(st_geometry(usa), col = "white", border = "black", bg = "lightblue1")
typoLayer(
x = datamap_pencil,
var="randoVar",
col = c("aquamarine4", "yellow3","#3c5cb0"),
lwd = .7,
legend.values.order = 1:3,
legend.pos = "bottomleft",
legend.title.txt = "",
add = TRUE
)
labelLayer(x = datamap, txt = "ID",
cex = 0.9, halo = TRUE, r = 0.15)
我首先注意到是因为当我尝试合并数据文件并使用该功能进行填充时,科罗拉多州出现“无数据”。同样,上面的代码似乎表明状态几何或 ID 已关闭。我不知道足够的 GIS 来理解为什么。我确实必须更改 CRS 投影,以便可以缓冲地图文件(getPencilLayer 不断抛出自我拦截错误,这似乎在 R 映射中很常见)。
关于做什么的任何想法?