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The O2A-INGEST performs automatic quality control to deliver quality-flagged data in the O2A-DASHBOARD. The automatic quality control requires the observation parameter properties in the O2A-SENSOR for each corresponding sensor and each quality control test. The input data is in NRT format, where each column of observations is under a unique sensor-URN. At ingest, the quality control algorithm builds a table of devices and parameters to assess the input data for correctness and validity of observations. The current flagging scheme is of primary level (Unesco 2013), i.e., quality flags are sequential and qualitative to describe a level of quality in the data. The starting point for the currently implemented quality control tests is the ARGO real-time quality control (Wong et al. 2019).
After requesting O2A-SENSOR for observation properties, the O2A-INGEST performs the following tests.
Test | Description | Property* | Ancillary data* | Status | ||||||
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Operation temperature range | Test for temperature conditions (air and/or surface temperature) under which the instrumentation is deployed. | Operation Temperature | Temperature observation |
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Manufacturer range | Test if the value is within the limits of the instrumentation (e.g. due to construction, material, or filter) given by the manufacturer. | Manufacturer range | None |
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Operation range | Test if the value is within a specific range valid for the location where the sensor is deployed. | Operation range | None |
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Gradient test | Test for gradient, i.e. absolute distance from the median value of neighboring (n=5) observations. | Gradient Threshold | None |
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Spike test | Test for spikes, i.e., distance from the median value subtracted by the standard deviation of neighboring (n=5) observations. | Spike Threshold | None |
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Range function | Test for physical relationships, or interdependency, among observations. | Thresholds array | None |
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Geolocation | Test for a valid geographic location of moving and stationary sensors. | Latitude, longitude and altitude ranges | Location of observations or Event ("Mount", "Deployment", or "Information") |
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*These parameters are required to perform the test.
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