compute spherical distance to a line/polygon

This function provides a convienant wrapper to dist2Line. Per that documentation, this measures the distance from

et_dist_to_polygon(latitude, longitude, poly_latitude, poly_longitude)

Arguments

latitude1	numeric vector of latitudes [degrees]
longitude1	numeric vector of longitudes [degrees] corresponding with latitude1
latitude2	numeric vector of latitudes [degrees] defining a polygon (or line)
longitude2	numeric vector of longitudes [degrees] corresponding with latitude2
latitude3	numeric vector of latitudes [degrees]
longitude3	numeric vector of longitudes [degrees] corresponding with latitude3

Value

numeric, distance along path in nautical miles