validateLonLat: Validate longitude and latitude values
Description
Longitude and latitude are validated to be parseable as numeric
and within the bounds -180:180 and -90:90. If validation fails, an error is
generated.
Usage
validateLonLat(longitude = NULL, latitude = NULL)
Arguments
longitude
Single longitude in decimal degrees E.
latitude
Single latitude in decimal degrees N.
Value
Invisibly returns TRUE if no error message has been generated.