[WARN-A001] - No package description in UML model -- Definition -- A specialisation of OM_Observation class. -- Description -- An instance of ESPAS_Observation describes the action of the observation within the context of ESPAS. Observation is the act that results in the estimation of the value of a feature property using a designated procedure, such as a sensor, instrument, algorithm or process chain. An observation is associated with a discrete time instant or period though which a number , term or other symbol is assigned to a phenomenon. The result of the observation (i.e. data) is an estimate of the value of a property of some feature, so the details of the observation are metadata concerning the value of the feature property. SOURCE [ ISO 19156:2011] -- Definition -- External identifier of the observation. -- Description -- NOTE The identifier may be used by an external application to reference an observation. EXAMPLE An identifier can be used for packaging an observation to an observation collection. -- Definition -- A free text description of the observation including its intentions. -- Definition -- Description of the geographic area , e.g. bounding polygon, within which the observation's result is available. -- Description -- GeographicExtent is the envelope of the geographic areas of multiple coverages. #NOTES -- Definition -- Status of the act of the observation. -- Description -- EXAMPLE Measurements of rain rate at Chilbolton Observatoty,UK are being conducted since 2000. The status of this observation is onGoing. NOTE If an observation is onGoing then the relative Project shall be onGoing. -- Definition -- Reference to documentation describing the observation. -- Definition -- The temporal resoultion of the observation data e.g. an hour, six hours, a day etc. -- Definition -- Narrative description of the result's domain density ( temporal and/or spatial resolution and/or spectral) . -- Definition -- Restrictions on the access and use of observation's result. -- Desription -- Restrictions on the access and use of the observation result are known without navigating from the obseravtion to the result. -- Definition -- Individual or organisation related to observation. #NOTES -- Definition -- Frequency with which additions are/were made to the observation's result. -- Description -- EXAMPLE Measurements of rain rate at Chilbolton Observatoty,UK are being conducted since 2000. This is an onGoing observation with a result being growing on a daily basis. -- Definition -- List of resources for on line access to the observation result. -- Definition -- A project that the observation is linked to.