同一坐标上有多个标记

Question

当从r包中绘制出交互式worlmap上的标记时,具有完全相同坐标的小叶数据将相互重叠.

请参阅以下示例:

library(leaflet)

Data <- structure(list(Name = structure(1:3, .Label = c("M1", "M2", "M3"), class = "factor"), Latitude = c(52L, 52L, 51L), Longitude = c(50L, 50L, 50L), Altitude = c(97L, 97L, 108L)), .Names = c("Name", "Latitude", "Longitude", "Altitude"), class = "data.frame", row.names = c(NA, -3L))

leaflet(data = Data) %>% 
              addProviderTiles("Esri.WorldImagery", options = providerTileOptions(noWrap = TRUE)) %>%
              addMarkers(~Longitude, ~Latitude, popup = ~as.character(paste(sep = "",
                                                                          "<b>",Name,"</b>","<br/>", "Altitude: ",Altitude)))

使用群集选项显示所有坐标是可能的,但这远非我的目标.我不想要聚类,只有在完全放大时才显示重叠的标记.完全放大后,背景地图变成灰色("地图数据尚未可用").重叠标记的蜘蛛视图是我想要的,但在完全放大时则不然.

见下面的例子:

leaflet(data = Data) %>% 
  addProviderTiles("Esri.WorldImagery", options = providerTileOptions(noWrap = TRUE)) %>%
  addMarkers(~Longitude, ~Latitude, popup = ~as.character(paste(sep = "",
                                                                "<b>",Name,"</b>","<br/>", "Altitude: ",Altitude)), clusterOptions = markerClusterOptions())

我找到了一些关于我想要的解决方案的文献,但我不知道如何在r传单代码/包中实现它. https://github.com/jawj/OverlappingMarkerSpiderfier-Leaflet

此外,如果有其他方法来处理重叠标记,请随时回答.(例如,一个弹出窗口中的多个标记信息)

Answer 1

你jitter()的坐标可以略微:

library(mapview)
library(sp)

Data <- structure(list(Name = structure(1:3, .Label = c("M1", "M2", "M3"), 
                                        class = "factor"), 
                       Latitude = c(52L, 52L, 51L), 
                       Longitude = c(50L, 50L, 50L), 
                       Altitude = c(97L, 97L, 108L)), 
                  .Names = c("Name", "Latitude", "Longitude", "Altitude"), 
                  class = "data.frame", row.names = c(NA, -3L))

Data$lat <- jitter(Data$Latitude, factor = 0.0001)
Data$lon <- jitter(Data$Longitude, factor = 0.0001)

coordinates(Data) <- ~ lon + lat
proj4string(Data) <- "+init=epsg:4326"

mapview(Data)

这样你仍然需要放大标记来分开,你需要放大多远取决于factor属性jitter().

请注意,我library(mapview)在示例中使用的是为了简单起见.