r-向RMAP添加多个标记

问题

如何使用添加多个标记

数据

coords <- structure(list(stop_id = 19841:19843, stop_name = c("Flagstaff Railway Station (Melbourne City)", 
"Melbourne Central Railway Station (Melbourne City)", "Parliament Railway Station (Melbourne City)"
), stop_lat = c(-37.8119813073807, -37.8099387667386, -37.8110540555305
), stop_lon = c(144.955653760429, 144.962593535096, 144.972910916416
)), .Names = c("stop_id", "stop_name", "stop_lat", "stop_lon"
), sorted = "stop_id", row.names = 17:19, class = c("data.table", 
"data.frame"))

但是我不知道如何从

coords

数据帧添加多个标记，而不为每个标记写

l$marker

行

我尝试过使用

GeoJSON

，但我对这一点还不熟悉，所以还没有意识到这一点，肯定是做错了什么

# library(rgdal)
# coords.sp <- SpatialPointsDataFrame(coords[,.(stop_lon, stop_lat)], coords[,.(stop_id, stop_name)])
# writeOGR(obj=coords.sp, dsn='coords.geojson', layer='OGRGeoJSON', driver='GeoJSON')

# gj <- readOGR("./coords.geojson", layer="OGRGeoJSON")
# l$geoJson(gj)
# l$geoJson("./coords.geojson")

GeoJSON

下面是从

writeOGR

命令生成的GeoJSON代码，我已经对其进行了验证

我可以使用来正确读取GeoJSON文件，然后使用

l$GeoJSON

将标记加载到地图上

## create spatial object and save as GeoJSON
# library(rgdal)
coords.sp <- SpatialPointsDataFrame(coords[,.(stop_lon, stop_lat)], coords[,.(stop_id, stop_name)])
writeOGR(obj=coords.sp, dsn='coords.geojson', layer='OGRGeoJSON', driver='GeoJSON')

l <- Leaflet$new()
l$setView(c(-37.8602828, 145.079616), zoom=11)
l$tileLayer(provider = "Acetate.terrain")

## Read the GeoJSON data
library(geojsonio)
gj <- geojson_read("./coords.geojson")
l$geoJson(gj)

##创建空间对象并另存为GeoJSON
#图书馆（rgdal）
coords.sp Hm关于
应用（unname（coords[，c（“stop_lat”，“stop_lon”））），1，l$marker）静脉中的循环如何？@lukeA，好主意，但目前它将标记放在了稍微错误的位置（但非常接近）；我会调查一下的。
library(leaflet)
leaflet() %>%
  addProviderTiles("Acetate.terrain") %>%
  setView(lat = -37.8602828, lng = 145.079616, zoom=11) %>%
  addMarkers(data=coords, lat=~stop_lat, lng=~stop_lon)

{
"type": "FeatureCollection",

"features": [
{ "type": "Feature", "id": 1, "properties": { "stop_id": 19841, "stop_name": "Flagstaff Railway Station (Melbourne City)" }, "geometry": { "type": "Point", "coordinates": [ 144.955653760428987, -37.811981307380698 ] } },
{ "type": "Feature", "id": 2, "properties": { "stop_id": 19842, "stop_name": "Melbourne Central Railway Station (Melbourne City)" }, "geometry": { "type": "Point", "coordinates": [ 144.962593535096005, -37.809938766738597 ] } },
{ "type": "Feature", "id": 3, "properties": { "stop_id": 19843, "stop_name": "Parliament Railway Station (Melbourne City)" }, "geometry": { "type": "Point", "coordinates": [ 144.972910916415998, -37.811054055530498 ] } }
]}

## create spatial object and save as GeoJSON
# library(rgdal)
coords.sp <- SpatialPointsDataFrame(coords[,.(stop_lon, stop_lat)], coords[,.(stop_id, stop_name)])
writeOGR(obj=coords.sp, dsn='coords.geojson', layer='OGRGeoJSON', driver='GeoJSON')

l <- Leaflet$new()
l$setView(c(-37.8602828, 145.079616), zoom=11)
l$tileLayer(provider = "Acetate.terrain")

## Read the GeoJSON data
library(geojsonio)
gj <- geojson_read("./coords.geojson")
l$geoJson(gj)