Hello Lupus,
This should be the list of correspondence:
{'BridgeDeck': 17,
'Building': 6,
'Created': 0,
'Ground': 2,
'HighNoise': 18,
'HighVegetation': 5,
'LowPoint': 7,
'LowVegetation': 3,
'MediumVegetation': 4,
'ModelKeyPoint': 8,
'OverlapPoints': 12,
'Rail': 10,
'RoadSurface': 11,
'TransmissionTower': 15,
'Unclassified': 1,
'Water': 9,
'WireConductor': 14,
'WireConnector': 16,
'WireGuard': 13}
In the version 1.3 we've added enum representation to the dense cloud classes via PhotoScan.PointClass.