find_stations: Find nearest stations using a point's coordinates
Description
find_stations returns a tibble with the nearest stations'
distances using a given point's longitude and latitude values. This function
uses the Haversine formula for distance calculation in km.
Usage
find_stations(longitude = 24, latitude = 38)
Arguments
longitude
a numeric value in degrees
latitude
a numeric value in degrees
Value
If the given longitude is in [24, 38] and the latitude is in [34, 42]
(i.e. are valid values for Greece) returns an ordered tibble with the
station_id, name, subdomain and distance values in km. The station's data
that are used come from the `stations` dataset. Otherwise returns an error
message.