![]() | These are the generic, automated Quality Control (QC) functions that will be applied to various OOI data products. |
![]() | In general the QC results use reverse Boolean logic. So, 0 means the value met the test conditions (e.g. for Global Range Test this would mean it exceeds the min/max) and is bad data, and 1 means it did not meet the test conditions and is good data. |
Locate the QC Flags in the DataNavigate to a Data Product and Initiate DownloadNavigate to the data product of interest, and initiate downloading data.
Ensure QC Variables are Checked and Timeframe is Appropriate1: Use Slider Bar to Adjust Timeframe of Data - Note that the download can take a significant amount of time because upon download the QC flags are computed, so ensure the slider bar for the time frame is adjusted appropriately for only the data of interest.
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Understand the Functions
Global Range Test
- falls within a give range
Spike Test
- individual data values that deviate significantly from surrounding data values
Stuck Value Test
- repeated occurrence of one value in a time series
Polytrend Test
- tests a time series for whether the data contain a significant portion of a polynomial
Local Range Test
- testing if measurements fall into a user-defined valid range, varies with measurement location
Gradient Test
- changes between successive data points fall within a certain range
Propogate Flags
- propagates "bad" qc flags to another (derived) datase
Source: https://github.com/ooici/ion-functions/tree/master/ion_functions/qc/README.txt
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