Skip to main content

How does Xweather control measurement data quality?

Xweather Optimize, Xweather Observe

Device-level checks
Your Vaisala devices perform initial quality assessments before transmitting data. If a measurement doesn't meet quality standards, the device marks it as rejected.

Platform-level validation
Our quality control service runs additional checks on all incoming data. Each measurement receives either "accepted" or "rejected" status based on comprehensive validation rules.

Message

Description

Data from

Marked as invalid by the measurement device.

Data coming from the device. The measurement is not valid. Refer to the device documentation for details.

Device hardware

Quality control not passed. Range check failed.

Quality control service check to verify that the measurements received from the devices are within the accepted range. The following global range check threshold values are applied: 

  • Air temperature −90 … +60 °C

  • Dew point temperature −80 … +40 °C

  • Frost point temperature −80 … +40 °C

  • Relative humidity 0–102 %

  • Air pressure 500–1100 hPa

  • Air pressure QNH 850–1100 hPa

  • Wind speed mean from 2 to 10 minutes 0–75 m/s (2 and 10 min)

  • Wind speed instant from 1 to 3 seconds value 0–115 m/s

  • Wind speed maximum (gust) from 2 to 10 minutes 0–115 m/s

  • Wind speed minimum from 2 to 10 minutes 0–75 m/s

  • Wind direction 0–360 °

  • Precipitation intensity 0–2400 mm/h

  • Short wave total radiation Global radiation 0–1600 W/m2

  • Visibility 0–160 km

  • Surface temperature −90 … +80 °C

  • Subsurface temperature −50 … +65 °C

  • Surface state 1–13

  • Rain intensity 0–2400 mm/h

  • Hail intensity 0–2400 mm/h

  • Snow intensity 0–2400 mm/h

  • NO 0–500 ppb

  • NO2 0–350 ppb

  • O3 0–300 ppb

  • CO 0–2500 ppb

  • CO2 300–1100 ppm

  • PM10 0–2500 ug/m3

  • PM2.5 0–1000 ug/m3

  • PM1 0–1000 ug/m3

  • SO2 0–2000 ppb

  • H2S 0–2000 ppb

  • Global horizontal irradiation (GHI) 0–1361 W/m2

  • Diffuse horizontal irradiance 0–600 W/m2

  • Direct irradiation 0–1000 W/m2

  • Reflected global horizontal irradiance 0–1361 W/m2

  • Photovoltaic panel soiling ratio 0–101 %

  • Photovoltaic panel transmission loss –1–50 %

  • Photovoltaic panel temperature −90 ... 90 °C

  • Tilt angle 0–180°

  • Tilt angle Y –180–180°

  • Tilt angle X –180–180°

  • Horizontal albedo 0–1

  • Background luminance 2-40000 cd/m2

  • Present weather WMO code table 4680, SYNOP present weather codes 0-99

Xweather quality control service

Quality control not passed. Cross check failed.

Quality control service check to verify that the measurements received are consistent with other parameters or statistical values measured or produced. The following cross checks between the different measurement parameters are applied:

  • Air temperature greater or equal to dew point temperature

  • Dew point temperature less or equal to air temperature

  • Air temperature greater or equal to frost point temperature

  • Frost point temperature less or equal to air temperature

  • Frost point temperature greater or equal to dew point temperature

  • Dew point temperature less or equal to frost point temperature

  • Rear-side plane of array (POA) less or equal to plane of array (POA) irradiation

  • Plane of array (POA) greater or equal to rear-side plane of array (POA)

  • Reflected global horizontal irradiance less or equal to global horizontal irradiation

  • Global horizontal irradiation greater or equal to reflected global horizontal irradiance

Quality control not passed. Step check failed.

Quality control service check to verify that the measurements received are within the limit values of maximum rate of change to make sure that the difference between two successive observations is not too big. The following steps check threshold values are applied:

  • Air temperature 3 °C

  • Dew point temperature 2 °C

  • Frost point temperature 2 °C

  • Relative humidity 10 %RH

  • Air pressure 0.5 hPa

  • Wind speed 20 m/s

  • Short wave total radiation 1000 W/m2

  • Surface temperature 5 °C

  • Subsurface temperatures 1 °C, 0.5 °C, and 0.11 °C

  • Photovoltaic panel soiling ratio 10 %

  • Photovoltaic panel transmission loss 30 %

  • Photovoltaic panel temperature 20 °C

  • Tilt angle 25°

Quality control not passed. Persistence check failed.

Quality control service check to notice if measurements received keep returning the same values on consecutive checks for the following measurement parameters:

  • Air temperature

  • Dew point temperature

  • Frost point temperature

  • Relative humidity

  • Air pressure

  • Wind speed

  • Wind direction

  • Surface temperature

  • Subsurface temperature

Get detailed information:
Use our measurement APIs to access comprehensive quality control details for each measurement, including specific check results and validation criteria.

Learn more:
See Why is some of the measurement data marked as rejected? for information about interpreting quality flags in your data.

Related Articles
Platform navigation and layout
Viewing and downloading measurements
Why is gas measurement data "Marked as invalid by measurement device"?
Why is some of the measurement data marked as rejected?
How can I download measurement data?
Did this answer your question?