Field area A location at which field experiments or observations of ambient conditions are conducted. A field area may contain many sites and has a geographical footprint that can be represented by a polygon. SamplingSurface Used by CriticalZone.org Useful for Critical Zone Observatory network and other programs to describe a terrestrial research area. Can be hiearchical (i.e. CRB-CZO > WhiteClayCreek@SWRC > TransectA. See http://criticalzone.org/christina/infrastructure/field-areas-christina/). 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.