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世界範圍geo.json從這裏下載。 https://github.com/johan/world.geo.json如何使用傳單繪製基於國家的choropleths R
我想突出顯示3個國家(在世界地圖視圖中),並根據該國家項目的數量以漸變顏色繪製它們。
我這裏還有我的步驟:
首先下載世界邊界geo.json文件並讀取它作爲底圖; 然後我嘗試在我的數據中突出顯示國家多邊形。然而事實證明,所有的世界國家都有着不同的顏色,並被3個國家的信息貼上標籤。它是幾何數據框子集問題?
WorldCountry <-geojsonio::geojson_read("./GeoData/countries.geo.json", what = "sp")
#Dataframe for choropleth map
Country <- c("Bulgaria","Pakistan","Turkey")
Projects <- c(2,1,6)
data <- data.frame(Country,Projects)
#basemap
Map <- leaflet(WorldCountry) %>% addTiles() %>% addPolygons()
#set bin and color for choropleth map
bins <- c(0,1,2,3,4,5,6,7,8,9,10,Inf)
pal <- colorBin("YlOrRd", domain = data$Projects, bins = bins)
#set labels
labels <- sprintf(
"<strong>%s</strong><br/>%g projects <sup></sup>",
data$Country, data$Projects) %>% lapply(htmltools::HTML)
#add polygons,labels and mouse over effect
Map %>% addPolygons(
fillColor = ~pal(data$Projects),
weight = 2,
opacity = 1,
color = 'white',
dashArray = '3',
fillOpacity = 0.7,
highlight = highlightOptions(
weight = 5,
color = "#666",
dashArray = "",
fillOpacity = 0.7,
bringToFront = TRUE),
label = labels,
labelOptions = labelOptions(
style = list("font-weight" = "normal", padding = "3px 8px"),
textsize = "15px",
direction = "auto")
)
我期待這樣的事情: