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 or the sun spectra; by default the measured radiances are retrieved |
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 |