A “soil plot” (SoilPlot object in the model) is the location of a specific soil investigation (e.g. of a trial pit). Because for many soil investigations the studied soil is destroyed, the soil site provides also the object to which the results of repeated investigations are related and handled as if they were obtained from the very same place. The purpose of the investigation can be of a general nature (e.g. a reconnaissance whereby soil profiles are taken for a general soil characterization) or specific (e.g. a reconnaissance whereby samples are taken to investigate potentially contaminated land); this information can be crucial for data evaluation to identify bias in the selection of sites. A soil plot within a soil site is of a certain type (borehole, trial pit, sample) and located by coordinates and/or the name of that location.