distm distHaversine -. mutate $, mutate , . , cbind c, c , , cbind ( ).
library(geosphere)
library(dplyr)
mutate(mydata,
Distance = distHaversine(cbind(Longitude, Latitude),
cbind(lag(Longitude), lag(Latitude))))
distCosine , NA, . , , :
modified_distCosine <- function(Longitude1, Latitude1, Longitude2, Latitude2) {
if (any(is.na(c(Longitude1, Latitude1, Longitude2, Latitude2)))) {
NA
} else {
distCosine(c(Longitude1, Latitude1), c(Longitude2, Latitude2))
}
}
mutate(mydata,
Distance = mapply(modified_distCosine,
Longitude, Latitude, lag(Longitude), lag(Latitude)))
mapply Longitude, Latitude, lag(Longitude), lag(Latitude).
, , , , .
mydata <- structure(list(Callsign = c("A118", "A118", "B222", "D123"),
Altitude = c(18000L, 18500L, 18500L, 19000L),
Speed = c(110L, 120L, 150L, 150L),
Direction = c(340L, 339L, 350L, 110L),
Date_Time = c("2017-11-06T22:28:09", "2017-11-06T22:29:09", "2017-11-08T07:28:09", "2018-05-29T15:13:27"),
Latitude = c(70.6086, 72.1508, 71.1689, 69.4523),
Longitude = c(58.2959, 58.7894, 59.1234, 68.1235)),
.Names = c("Callsign", "Altitude", "Speed", "Direction", "Date_Time", "Latitude", "Longitude"),
class = "data.frame", row.names = c(NA, -4L))