Many common environmental models share the same underlying stochastic pattern. In general, this means that we can use similar math to capture the characteristics of behavior across a range of domains even though the measured quantities are not comparable.

The important case for PCC estimates is the probability density function (PDF) of environmental characteristics showing a spread in uncertainty in values.

PDFs and other models can be searched according to feature keywords or SWEET (Semantic Web for Earth and Environmental Terminology) categories based on applicability to the context space.