From CUAHSI documentation:
UAHSI ODM is consistent with the practice of other data systems:- QualityControlLevelCode = "0" - Raw Data
Raw data is defined as unprocessed data and data products that have not undergone quality
control. Depending on the data type and data transmission system, raw data may be available
within seconds or minutes after real-time. Examples include real time precipitation,
stream flow and water quality measurements.
- QualityControlLevelCode = "1" - Quality Controlled Data
Quality controlled data have passed quality assurance procedures such as routine estimation
of timing and sensor calibration or visual inspection and removal of obvious errors. An
example is USGS published stream flow records following parsing through USGS quality
control procedures.
- QualityControlLevelCode = "2" - Derived Products
Derived products require scientific and technical interpretation and include multiple-sensor
data. An example might be basin average precipitation derived from rain gages using an
interpolation procedure.
- QualityControlLevelCode = "3" - Interpreted Products
These products require researcher (PI) driven analysis and interpretation, model-based
interpretation using other data and/or strong prior assumptions. An example is basin average
precipitation derived from the combination of rain gages and radar return data.
- QualityControlLevelCode = "4" - Knowledge Products
These products require researcher (PI) driven scientific interpretation and multidisciplinary
data integration and include model-based interpretation using other data and/or strong prior
assumptions. An example is percentages of old or new water in a hydro-graph inferred from
an isotope analysis.
These definitions for quality control level are stored in the QualityControlLevels table. These
definitions are recommended for use, but users can define their own quality control level system.
The QualityControlLevels table is not a controlled vocabulary, but specification of a quality
control level for each data value is required.