Get grouped monitoring stations that are near each other
Source:R/Utilities.R
TADA_GetUniqueNearbySites.Rd
This function takes a TADA dataset that contains grouped nearby monitoring stations and returns a unique dataset of the original MonitoringLocationIdentifier, the grouped TADA.MonitoringLocationIdentifier, TADA.LongitudeMeasure, and TADA.LatitudeMeasure, filtered for only those stations that have a nearby station.