SamplingFeatureType ODM2 Working Group A vocabulary for describing the type of SamplingFeature. Many different SamplingFeature types can be represented in ODM2. SamplingFeatures of type Site and Specimen will be the most common, but many different types of varying levels of complexity can be used. CTD A CTD (Conductivity, Temperature, and Depth) cast is a water column depth profile collected over a specific and relatively short date-time range, that can be considered as a parent specimen. Specimen SESAR. See http://www.geosamples.org/help/vocabularies#object.