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 |