Welcome to the AirNet Sensor Data Quality Validation service.
Station: Arctic Research Center, Hokkaido University, Sapporo, Japan also known as "Purple Air 169951" located at "次世代物質生命科学研究センター, 環状通, 北十九条西十三丁目, 北19条西13, Kita Ward, Sapporo, Ishikari Subprefecture, Hokkaido Prefecture, 060-0818, Japan".Explanations
On the first graph below (labeled "data readings confidence zone"), the red line represents the hourly readings from the sensor, while the green line represents the median of the hourly readings of the station neighbors.
The zone filled in green represents the confidence zone, equivalent to 3 times the standard deviation of the neighbor stations.
Each time the station hourly reading goes above the confidence zone, the station is considered producing abnormal reading.
The larger the difference between the hourly reading and confidence zone, the more likely the station is considered as producing invalid data.
The formula is defined as:
P=probability, D=distance and W=P*D
where 'i' is iterated over the past 3 days data and 'n' is the number of samples during those past 3 days (most likely n = 24*3).
If W>30, the station is automatically disabled.
Show me the data
Further questions
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