R-使用传单时可视化问题

Question

我有两个数据框：

PickUP <- data.frame(pickuplong = c(-73.93909 ,-73.94189 ,-73.93754,-73.91638,-73.92792 ,-73.88634), pickuplat =c(40.84408,40.83841,40.85311,40.84966,40.86284,40.85628)) 
Dropoff <- data.frame(pickuplong = c(-73.93351 ,-73.93909 ,-73.93909 ,-73.80747,-73.95722,-73.91880), pickuplat =c(40.76621,40.84408,40.85311,40.69951,40.68877,40.75917), Droplong =c(-73.91300,-73.96259 ,-73.94870,-73.93860,-73.93633, -73.90690), Droplat =c(40.77777,40.77488 ,40.78493,40.84463,40.75977,40.77013)) 

我尝试在拾取数据框架中找到拾取协调(长度和纬度(，该在 dropoff dataf dataframe 中重复。我有以下代码，但我对此有错误：

library(sp)
library(rgdal)
library(leaflet)
library(mapview)
library(dplyr)
a <- semi_join(Dropoff , PickUP , by = c("pickuplong","pickuplat"))
a$ID <- 1:nrow(a) 
Dropoff_p <- a[, c("ID", "Pickup_longitude", "Pickup_latitude")]
Dropoff_d <- a[, c("ID", "Dropoff_longitude", "Dropoff_latitude")]
coordinates(Dropoff_p) <- ~Pickup_longitude + Pickup_latitude
coordinates(Dropoff_d) <- ~Dropoff_longitude + Dropoff_latitude
proj4string(Dropoff_p) <- CRS("+init=epsg:4326")
proj4string(Dropoff_d) <- CRS("+init=epsg:4326")
map_p <- mapview(Dropoff_p, color = "red")
map_d <- mapview(Dropoff_d, color = "blue")
map_p + map_d

我的错误是：

$＆lt; - 。data.frame中的错误( tmp ，" id"，value = c(1l，0l((： 替换有2行，数据在包裹期间有0个错误：无法打开 连接

Answer 1

子集在数据框架时，您必须使用相同的列名。我更改了Dropoff_p，Dropoff_d，coordinates(Dropoff_p)和proj4string(Dropoff_d)中的列名，然后您的脚本工作。

此外，mapview软件包只有一个新的更新。如果需要，可以将mapview更新为2.0.1版本。您还可以添加col.regions = "red"和col.regions = "blue"，因为在新版本下，color参数只会更改点的轮廓。要更改填充颜色，请使用col.regions。

library(sp)
library(rgdal)
library(leaflet)
library(mapview)
library(dplyr)
a <- semi_join(Dropoff , PickUP , by = c("pickuplong","pickuplat"))
a$ID <- 1:nrow(a) 
Dropoff_p <- a[, c("ID", "pickuplong", "pickuplat")]
Dropoff_d <- a[, c("ID", "Droplong", "Droplat")]
coordinates(Dropoff_p) <- ~pickuplong + pickuplat
coordinates(Dropoff_d) <- ~Droplong + Droplat
proj4string(Dropoff_p) <- CRS("+init=epsg:4326")
proj4string(Dropoff_d) <- CRS("+init=epsg:4326")
map_p <- mapview(Dropoff_p, color = "red", col.regions = "red")
map_d <- mapview(Dropoff_d, color = "blue", col.regions = "blue")
map_p + map_d