综合运用

在 R 中使用 leaflet 构建交互式地图

Rich Majerus

Vice President of Strategy & Planning, Queens University of Charlotte

回顾

Leaflet 与 htmlwidgets
底图
圆形标记
颜色调色板
多边形
图层
修饰

北卡州对数收入分级统计图 2

北卡州对数收入分级统计图 3

综合运用

leaflet() %>% 
  addTiles(group = "OSM") %>% 
  addProviderTiles("CartoDB", group = "Carto") %>% 
  addProviderTiles("Esri", group = "Esri") %>%

  addPolygons(data = shp, weight = 1, fillOpacity = .75,
              color =  ~nc_pal(log(mean_income)),
              label = ~paste0("Mean Income: ", 
                              dollar(mean_income)),
              group = "Mean Income") %>%

综合运用

  addCircleMarkers(data = nc_public, radius = 2, 
                   label = ~htmlEscape(name), 
                   color = ~pal(sector_label),group = "Public") %>% 
  addCircleMarkers(data = nc_private, radius = 2, 
                   label = ~htmlEscape(name),
                   color = ~pal(sector_label), group = "Private") %>% 
  addCircleMarkers(data = nc_profit, radius = 2, 
                   label = ~htmlEscape(name),
                   color = ~pal(sector_label),
                   group = "For-Profit") %>% 

  addLayersControl(baseGroups = c("OSM", "Carto", "Esri"), 
                   overlayGroups = c("Public", "Private",
                                     "For-Profit",
                                     "Mean Income"))

综合运用

北卡州对数收入分级统计图 4

保存地图

# Store leaflet map in object
m <- leaflet() %>% 
     addTiles() %>%
     addMarkers(data = ipeds,
                clusterOptions = markerClusterOptions()) %>% 
     addPolygons(data = shp)

# save leaflet object as html file
library(htmlwidgets)

saveWidget(m, file="myMap.html")

Passons à la pratique !

在 R 中使用 leaflet 构建交互式地图