code: def get_v_distance(self, latlonalt1, latlonalt2):
          '''get the horizontal distance between threat and vehicle'''
          (lat1, lon1, alt1) = latlonalt1
          (lat2, lon2, alt2) = latlonalt2
          return alt2 - altf get_v_distance(self, latlonalt1, latlonalt2):
          '''get the horizontal distance between threat and vehicle'''
          (lat1, lon1, alt1) = latlonalt1
          (lat2, lon2, alt2) = latlonalt2
          return alt2 - alt1
docs: get the horizontal distance between threat and vehicle