Depth interval A discrete segment along a longer vertical path, such as a borehole, soil profile or other depth profile, in which an observation or specimen is collected over the distance between the upper and lower depth limits of the interval. A Depth Interval is a sub-type of Interval. SamplingCurve CZchemDB 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.