WMO METCE observation types (2013) 2 Observation types for METCE (2013). 2014-09-03T09:52:33.909Z The items within this code table are specialized observation or measurement types defined within 'Modèle pour l'Échange des informations sur le Temps, le Climat et l'Eau' (METCE). Each observation or measurement type listed herein is specified as a class in METCE that derives from the OM_Observation class (defined in ISO 19156, Geographic information - Observations and measurements, clause 6.2) or sub-class thereof. 2014-09-03T09:52:33.79Z D-3 Code Table D-3: METCE observation types 2