GOMOS_L1_TRANSMISSION

Variables

The table below lists the variables that are present in the HARP product that results from an ingestion of GOMOS_L1_TRANSMISSION data.

field name	type	dimensions	unit	description
datetime_start	double	{time}	[seconds since 2000-01-01]	start time of the measurement
datetime_length	double		[s]	integration time for a readout
orbit_index	int32			absolute orbit number
latitude	double	{time}	[degree_north]	latitude of the apparent tangent point
longitude	double	{time}	[degree_east]	longitude of the apparent tangent point
altitude	double	{time}	[m]	altitude of the apparent tangent point
wavelength_photon_transmittance	double	{time, spectral}	[(count/s/cm2/nm)/(count/s/cm2/nm)]	wavelength photon transmittance of each spectrum measurement
wavelength_photon_transmittance_uncertainty	double	{time, spectral}	[(count/s/cm2/nm)/(count/s/cm2/nm)]	error in the wavelength photon transmittance of each spectrum measurement
wavelength	double	{spectral}	[nm]	nominal wavelength assignment for each of the detector pixels
sensor_latitude	double	{time}	[degree_north]	latitude of the satellite position at half-measurement
sensor_longitude	double	{time}	[degree_east]	longitude of the satellite position at half-measurement
sensor_altitude	double	{time}	[m]	altitude of the satellite at half-measurement
scene_type	int8			illumination condition for each profile; enumeration values: dark (0), bright (1), twilight (2), straylight (3), twilight_straylight (4)
index	int32	{time}		zero-based index of the sample within the source product

Mapping description

GOMOS Level 1 products only contain a single profile; all measured transmission data will be provided in order from high altitude to low altitude in the profile

The table below details where and how each variable was retrieved from the input product.

field name	mapping description
datetime_start	path	/tra_transmission/dsr_time
datetime_length	path	/sph/samp_duration
orbit_index	path	/mph/abs_orbit
latitude	path	/tra_geolocation/tangent_lat[1]
longitude	path	/tra_geolocation/tangent_long[1]
altitude	path	/tra_geolocation/tangent_alt[1]
wavelength_photon_transmittance	path	/tra_transmission[]/trans_spectra[]
wavelength_photon_transmittance_uncertainty	path	/tra_transmission[]/cov[]
	description	the square root of the variance values are taken to provide the standard uncertainty
wavelength	path	/tra_nom_wav_assignment[]/nom_wl[]
sensor_latitude	path	/tra_geolocation/lat[1]
sensor_longitude	path	/tra_geolocation/longit[1]
sensor_altitude	path	/tra_geolocation/alt[1]
scene_type	condition	CODA product version 0
	path	/tra_summary_quality[0]/limb_flag
	condition	CODA product version 1 and higher
	path	/tra_summary_quality[0]/obs_illum_cond