ISMN quality flags overview

ISMN qualty contol uses different techniques to detect dubious soil moisture observations, geophysical dynamic range verification (simple threshold checks), geophysical consistency methods (ancillary data used to flag soil moisture), and spectrum-based methods (series of conditions applied to the soil moisture measurement time series and their first and second derivatives).

Example plot of spectrum-based ISMN quality flag D10 - "Saturated Plateau" in soil moisture time-series:

Overview flagging methods:

variable	flag category	flag	condition
soil moisture	C - reported value exceeds output format field size	C01	soil moisture < 0.0 m³/m³
		C02	soil moisture > 0.6 m³/m³
		C03	soil moisture > saturation point (derived from HWSD parameter values)
	D - questionable/dubious - geophysical based	D01	in situ soil temperature^(*) < 0°C
		D02	in situ air temperature < 0°C
		D03	GLDAS soil temperature^(*) < 0°C
		D04	soil moisture shows peaks without precipitation event (in situ) in the preceding 24 hours
		D05	soil moisture shows peaks without precipitation event (GLDAS) in the preceding 24 hours
	D - questionable/dubious - spectrum based	D06	a spike is detected in soil moisture spectrum
		D07	a negative jump is detected in soil moisture spectrum
		D08	a positive jump is detected in soil moisture spectrum
		D09	low constant values (for a minimum time of 12 hours) occur in soil moisture spectrum
		D10	saturated plateau (for a minimum time length of 12 hours) occurs in soil moisture spectrum
			^(*)at corresponding depth layer
soil temperature	C - reported value exceeds output format field size	C01	soil temperature < -60°C
soil temperature	C - reported value exceeds output format field size	C02	soil temperature > 60°C
soil surface temperature	C - reported value exceeds output format field size	C01	soil surface temperature < -60°C
soil surface temperature	C - reported value exceeds output format field size	C02	soil surface temperature > 60°C
air temperature	C - reported value exceeds output format field size	C01	air temperature < -60°C
air temperature	C - reported value exceeds output format field size	C02	air temperature > 60°C
precipitation	C - reported value exceeds output format field size	C01	precipitation < 0 mm/h
precipitation	C - reported value exceeds output format field size	C02	precipitation > 100 mm/h
soil suction	C - reported value exceeds output format field size	C01	soil suction < 0 kPa
soil suction	C - reported value exceeds output format field size	C02	soil suction > 2500 kPa
snow water equivalent	C - reported value exceeds output format field size	C01	snow water equivalent < 0 mm
snow water equivalent	C - reported value exceeds output format field size	C02	snow water equivalent > 10000 mm
snow depth	C - reported value exceeds output format field size	C01	snow depth < 0 mm
snow depth	C - reported value exceeds output format field size	C02	snow depth > 10000 mm
all dynamic variables		M	parameter value missing
all dynamic variables		G	good

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