Is it a latitude/longitude pair (latitude first)?

Tests whether each element is a two-part geographic coordinate with latitude first, in either degrees-minutes-seconds form with N/S/E/W hemisphere letters ("40 deg 44' 55\" N, 74 deg 00' 22\" W") or decimal-degree form ("34.0522, -118.2437"). Latitude must be in [-90, 90] and longitude in [-180, 180].

Usage

is_coord_latlon(x)

Arguments

x

A character vector of candidate values.

Value

A logical vector: TRUE for a lat-first coordinate pair in range, FALSE otherwise, NA where x is NA.

Details

A bracketed interval ("[a, b]"), a dashed/to range, a bare single number, or an integer comma pair ("10, 40") is rejected. DMS axis order is read from the hemisphere letters; a decimal pair is latitude-first unless the first value exceeds 90 (see is_coord_lonlat()).

See also

is_coord_lonlat(), is_iso6709(), guess_data_type()

Other coordinate detectors: is_coord_lonlat(), is_iso6709()