1) laboratory calibration,
2) on-site intercomparison,
3) automated QA, and
4) manual QA.
In the instrument laboratory, all sensors (except the soil moisture sensors) are calibrated to validate or improve upon factory calibrations.
Finally, the Mesonet’s QA meteorologists employ numerous manual techniques to complement automated QA including analysis of monthly statistics to detect sensor drift or bias (click on a month and year above to download a PDF version of a Monthly Report). For another example of manual QA techniques, download the Summary of Obstructions to Pyranometers. In addition to detecting problematic sensors, the QA meteorologists trace the true start time of each problem so that appropriate data can be manually flagged as erroneous. The QA meteorologists are responsible for communicating problems to, and coordinating with, appropriate field technicians to ensure proper resolution (see a list of the current outstanding tickets below).
|Station||Variable||Date Reported||Problem Description|
|A132||VW45||10-Jan-2018 11:33||45 cm soil moisture frequently reports values near 0 for voltages 1-3. Soil temperature looks fine.|
|A256||VW25||18-Jan-2018 12:39||Errant spikes in soil moisture at 25 cm caused by variations in V252 since 19-DEC-2017 rain event.|