ObservationType
includes the following code list values (member concepts):
- angularObservation
 - calculated
 - distanceObservation
 - gnssObservation
 - imageObservation
 - levelObservation
 - meteoObservation
 - tiltObservation
 - TPSobservation
 - User defined value
 - pointCloudObservation
 
Scope Note:
OGC® Land and Infrastructure Conceptual Model Standard (LandInfra)
http://docs.opengeospatial.org/is/15-111r1/15-111r1.html LandInfra 7.8.3.13 and Figure: 46: SurveyObservation Classes with TargetPoint results
Identifier: 
http://www.cadastralvocabulary.org/CaLATheCodeList/ObservationType