# 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]

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