compute spherical distance along path

This function provides a convienant wrapper to alongTrackDistance. Per that documentation, this measures the distance along the great circle defined by the path_* inputs to the point(s) on that path nearest the point(s) defined by latitude and longitude. Note that the input point(s) need not be on the path

et_dist_along_path(latitude, longitude, path_latitude1, path_longitude1,
  path_latitude2, path_longitude2)

Arguments

latitude	numeric vector of latitudes [degrees]
longitude	numeric vector of longitudes [degrees] corresponding with latitude
path_latitude1	numeric vector of latitudes [degrees]
path_longitude1	numeric vector of longitudes [degrees] corresponding with path_latitude1
path_latitude2	numeric vector of latitudes [degrees]
path_longitude2	numeric vector of longitudes [degrees] corresponding with path_latitude2

Value

numeric, distance along path in nautical miles