This function returns a distance from a given 'home' coordinate for each individual trip.
Use the home
argument to provide a single, common 2-element (x,y or lon,lat) coordinate. If home
is NULL
(the default), then each individual trip's first location is used.
homedist(x, home = NULL)
numeric vector of distances in km (for longlat), or in the units of the trip's projection
trip object
see details