The Plot ontology embodies the OGC's Observations and Measurements conceptual model to capture plot-based ecological data.
As of April, 2019, the Plot ontology is based on the W3C's SSN ontology. The Plot ontology describes sites as the feature of interest of all observations and observation collections with bioregions as the sites' ultimate feature of interest. Observations can be grouped by theme as an observation collection. Observations are recorded with a result, obtained by some procedure at a phenomenon time.
A set of controlled vocabularies encoded as SKOS are expected to describe the observations, observation groups, procedures, results, etc.