Prepare raw Ecotone data for Movebank upload.
prep_ecotone.Rd
This function modifies raw Ecotone GPS data to remove any records without lat/long values, inserts a "behavior" column to indicate when a tagged bird is at the colony, adds a timestamp column ("Date_2") if not already there, and removes any duplicate detections. The function also inserts lat/long coordinates for the colony location for periods when the bird is at the colony.