Instrument is one particular instrument.<br /></p><p><br /></p><p>The instrument should be immutable within one OM_Observation.<br /></p><p><br /></p><p>Therefore a 'segment' could be made up of several OM_Observations. e.g. when an instrument changes.<br /></p><p><br /></p><p>------------------<br /></p><p>Could add a constraint that the procedure.method in every OM_Observation in a Collection (WIGOS Observation) must be the same.<br /></p><p>------------------------------<br /></p><p>Constraint that sensor must use method.<br /></p><p><br /></p><p>-------------------------------------------------<br /></p><p><br /></p><p><br /></p><p><br /></p><p>----------------------------<br /></p><p>Issues around 'deployment' of instruments. Need to capture the time an instrument/sensor was deployed during the lifespan of an observation.<br /></p><p>[SEE WHITEBOARD IN 'Process Types' Package]<br /></p><p><br /></p><p>-----------------------------<br /></p><p><br /></p><p>Source - belongs to 'Method' class - codelist. Automatic or Manual (501 codetable).<br /></p><p><br /></p><p>Method - belongs to 'Method' class.<br /></p><p>Constraint - source and method must be the same for every OM_Observation in the Collection.<br /></p><p><br /></p><p><br /></p>