我正在尝试在R中创建一个交互式webmap,以使用Shiny,Leaflet和rCharts显示风暴(该结构基于http://ramnathv.github.io/bikeshare app)。
这个想法是用户一次选择一个风暴名称(df $ Name),并且该风暴的标记(纬度/经度)显示在传单地图中(具有放大/缩小功能)。
我无法让Leaflet为每个单独的风暴名称加载新地图和标记。任何帮助/建议将不胜感激!
这就是数据(TCs.Rda)的样子(上传的样本数据文件here):
Year Name Wind lat long
2010 BONNIE 15 30.100 -91.000
2010 FIVE 25 30.000 -88.900
2010 FIVE 25 30.400 -88.800
2010 FIVE 25 30.800 -88.600
library(shiny); library(rCharts); library(leaflet)
load("TCs.Rda")
name <- sort(unique(data$Name))
shinyServer(function(input, output){
dataset <- reactive({ df <- data[data$Name == input$name, ] })
output$add <- renderText({paste("Storm name:", input$name)})
output$Controls <- renderUI({
list(selectInput("name", "Select storm", name, selected=name[1])) })
output$myChart <- renderMap({
df <- dataset()
map <- Leaflet$new()
map$setView(c(35, -80),zoom=5)
map$tileLayer(provider='Stamen.TonerLite')
for (i in 1:nrow(df)) {
map$marker(c(df[i, "lat"], df[i, "long"]), bindPopup=df[i, "Wind"])}
map$set(dom='myChart')
map$enablePopover(TRUE)
map$fullScreen(TRUE)
map
})
})
library(shiny); library(rCharts); library(leaflet)
shinyUI(pageWithSidebar(
headerPanel("Storm tracks"),
sidebarPanel(h3("My subtitle"), uiOutput("Controls")),
mainPanel(
tabsetPanel(
h3(textOutput("add")),
tabPanel("map", tags$style(".leaflet {height: 400px;}"), # I can only get this to work with a tabset panel, but ideally both the textOutput and map would go directly in the mainPanel
showOutput("myChart", "leaflet")))
)
))
答案 0 :(得分:6)
我最终弄明白了!另一篇文章(Shiny renders a responsive rCharts leaflet map once, but is blank if you change the input variable)表示代码行&#34;映射$ set(dom =&#39; myChart&#39;)&#34;可能会阻止Leaflet在每个选择上重新加载新地图。
我不认为这可能是问题(我的例子有点不同,并没有使用geojson),但显然它是。
这是我的工作代码,万一它可以帮助其他人 -
library(shiny);library(rCharts);library(leaflet)
load("TCs.Rda")
name <- sort(unique(data$Name))
shinyServer(function(input, output){
dataset <- reactive({df<- data[data$Name == input$name, ]})
output$add <- renderText({paste("Storm name:", input$name)})
output$Controls <- renderUI({list(selectInput("name", "Select storm", name, selected=name[1]) ) })
output$myChart <- renderMap({
df <- dataset()
map <- Leaflet$new()
map$setView(c(35, -80),zoom=3)
map$tileLayer(provider='Stamen.TonerLite')
for (i in 1:nrow(df)) {map$marker(c(df[i, "lat"], df[i, "long"]))}
map$fullScreen(TRUE)
map
})
})
library(shiny); library(rCharts); library(leaflet)
shinyUI(pageWithSidebar(
headerPanel("Storm tracks"),
sidebarPanel(h3("My subtitle"), uiOutput("Controls")),
mainPanel(
tabsetPanel(
tabPanel("map", h3(textOutput("add")),
tags$style(".leaflet {height: 400px;}"),
showOutput("myChart", "leaflet")))
)
))
结果如下:
答案 1 :(得分:2)
我强烈推荐rstudio's leaflet。
我有一个关于它的介绍性教程以及为什么它在这里非常棒:http://www.r-bloggers.com/the-leaflet-package-for-online-mapping-in-r/
此外,我正在使用它为DfT构建交互式规划工具:https://github.com/npct/pct
祝你好运!