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Plot (Site/Sample)
Transect (Sample)
Quadrat (Sample)
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See https://confluence.csiro.au/display/seegrid/Observations+and+Sampling#ObservationsandSampling-Samplingfeaturesclassifiedbyshape for modelling spatial sampling features. |
Sites are also Samples.
Information model
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Site, Transect and Quadrat are subclasses of Sample. Observations and Samplings refer to the proximate feature of interest with path chains of is-sample-of relationships to the Site (ultimate-feature-of-interest). Observations and Samplings can also reach the Site via the Site Visit.
Key points
The ultimate - feature - of - interest for any observation is always the Site (except for opportunistic observations). The Site is a type of Sample with a Site Visit.
In an Observation, the Site can always be discovered through the chain of is-sample-of relationships or via the Site Visit.
Other domain-specific things are always a Sample defined by the feature-type property. If they require core properties or relationships, then they can be defined as a subclass of Sample (transect, quadrat, soil profile, etc.).
Time-related information for transects and quadrats are recorded in the Observation or in the Sampling. It is not worth the added complexity of adding nested sites and site visits for the start and end time times of the site visit. This information can also be calculated by looking at the min and max time of all activities (Observations and Samplings) during a Site Visit.
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The modal displays contextual information such as the feature of interest of these observations (Sampled Soil feature). The “parent sample” of the soil specimen is the Sampled horizon. Sample depth is an attribute of the sampling. The data table contains the observations on the soil specimen. In this case, the properties of pH and EC were observed.
Scenario 2: Worked example for University of Sydney survey data
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Data
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The ultimate - feature-of-interest can always be found by stopping on the is-sample-of chain individual who is the same as the site of the Site Visit.