Welcome to the AirNet Sensor Data Quality Validation service.
Station: Craignair Road, London Borough of Lambeth, United Kingdom also known as "Citizen Science project sensor.community 84398" located at "Greenleaf Close, Craignair Road, Streatham Hill, London Borough of Lambeth, London, Greater London, England, SW2 2HB, United Kingdom".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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