GOME_L1_EXTRACTED

Variables

The table below lists the variables that are present in the HARP product that results from an ingestion of GOME_L1_EXTRACTED data.

field name

type

dimensions

unit

description

datetime_stop

double

{time}

[seconds since 2000-01-01]

time of the measurement at the end of the integration time

datetime_length

double

{time}

[s]

length of each measurement

orbit_index

int32

absolute orbit number

latitude

double

{time}

[degree_north]

tangent latitude of the measurement

longitude

double

{time}

[degree_east]

tangent longitude of the measurement

latitude_bounds

double

{time, 4}

[degree_north]

corner latitudes for the ground pixel of the measurement

longitude_bounds

double

{time, 4}

[degree_east]

corner longitudes for the ground pixel of the measurement

wavelength_photon_radiance

double

{time, spectral}

[count/s/cm2/sr/nm]

measured radiances

wavelength_photon_radiance_uncertainty

double

{time, spectral}

[count/s/cm2/sr/nm]

absolute radiance measurement error

wavelength

double

{time, spectral}

[nm]

nominal wavelength assignment for each of the detector pixels

integration_time

double

{time, spectral}

[s]

integration time for each pixel

scan_subindex

int8

{time}

relative index (0-3) of this measurement within a scan (forward+backward)

scan_direction_type

int8

{time}

scan direction for each measurement; enumeration values: forward (0), backward (1)

solar_zenith_angle

double

{time}

[degree]

solar zenith angle at instrument

solar_azimuth_angle

double

{time}

[degree]

solar azimuth angle at instrument

viewing_zenith_angle

double

{time}

[degree]

line of sight zenith angle at instrument

viewing_azimuth_angle

double

{time}

[degree]

line of sight azimuth angle at instrument

index

int32

{time}

zero-based index of the sample within the source product

Ingestion options

The table below lists the available ingestion options for GOME_L1_EXTRACTED products.

option name

legal values

description

band

band-1a, band-1b, band-2a, band-2b, band-3, band-4, blind-1a, straylight-1a, straylight-1b, straylight-2a

only include data from the specified band (‘band-1a’, ‘band-1b’, ‘band-2a’, ‘band-2b’, ‘band-3’, ‘band-4’, ‘blind-1a’, ‘straylight-1a’, ‘straylight-1b’, ‘straylight-2a’); by default data from all bands is retrieved

data

sun_reference

retrieve the measured radiances (default) or the sun spectra (data=sun_reference)

This definition is only applicable when: data unset

Mapping description

GOME Level 1 Extracted Spectra

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

field name

mapping description

datetime_stop

path

/egp[]/agi/groundpixel_end

datetime_length

description

set to fixed value of 1.5 [s]

orbit_index

path

/pir/start_orbit

latitude

path

/egp[]/agi/coords[4]/latitude

description

tangent latitude of the measurement

longitude

path

/egp[]/agi/coords[4]/longitude

description

tangent longitude of the measurement

latitude_bounds

path

/egp[]/agi/coords[0:3]/latitude

description

The corners are rearranged in the following way: 1,3,2,0

longitude_bounds

path

/egp[]/agi/coords[0:3]/longitude

description

The corners are rearranged in the following way: 1,3,2,0

wavelength_photon_radiance

path

/egp[]/brda[]/edr[]/abs_radiance

description

will be set to NaN is brda record is not available or if egp[]/brda[]/edr[]/flag != 0

wavelength_photon_radiance_uncertainty

path

/egp[]/brda[]/edr[]/abs_rad_err

description

will be set to NaN is brda record is not available or if egp[]/brda[]/edr[]/flag != 0

wavelength

path

/egp[]/brda[]/edr[]/wavelength

integration_time

path

/egp[]/brda[]/integration_time

scan_subindex

path

/egp[]/sub_counter

description

if a measurement consisted of multiple ground pixels, the subset counter of the last pixel is taken

scan_direction_type

path

/egp[]/sub_counter

description

the scan direction is based on the subset counter of the measurement; 0-2: forward (0), 3: backward (1)

solar_zenith_angle

path

/egp[]/agi/solar_angles_spacecraft/zenith_b

solar_azimuth_angle

path

/egp[]/agi/solar_angles_spacecraft/azimuth_b

viewing_zenith_angle

path

/egp[]/agi/los_spacecraft/zenith_b

viewing_azimuth_angle

path

/egp[]/agi/los_spacecraft/azimuth_b