distance: Compute great circle distances

In thackl/thacklr: A Collection of R Functions and Snippets I Often Use.

Compute great circle distances

Description

Wraps distVincentyEllipsoid in tidy semantics to compute and add the shortest distance between to points on a globe to a table of coordinates.

Usage

distance(
  .data,
  lat = lat,
  long = long,
  lat_from = NULL,
  long_from = NULL,
  dist_col = "dist",
  along = TRUE,
  ...
)

Arguments

.data	a tbl with coordinates in degrees
lat, long	latitude and longitude columns (unquoted)
lat_from, long_from	optional reference point coordinates
dist_col	name of the output column
along	if TRUE return cumulative distances along points
...	arguments passed on to distVincentyEllipsoid

Examples

stations <- tibble(
  lat=c(50,55,60),
  long=c(180,180,180)
)

# cumulative distance along transect stations
stations %>% distance

# distances to almost Greenwich
stations %>%
  distance(lat_from=0, long_from=0, along=FALSE)

thackl/thacklr documentation built on Oct. 16, 2023, 9:15 p.m.