S5P_L2_HCHO
Variables
The table below lists the variables that are present in the HARP product that results from an ingestion of S5P_L2_HCHO data.
field name |
type |
dimensions |
unit |
description |
|---|---|---|---|---|
scan_subindex |
int16 |
{time} |
pixel index (0-based) within the scanline |
|
datetime_start |
double |
{time} |
[seconds since 2010-01-01] |
start time of the measurement |
datetime_length |
double |
[s] |
duration of the measurement |
|
orbit_index |
int32 |
absolute orbit number |
||
validity |
int32 |
{time} |
processing quality flag |
|
latitude |
float |
{time} |
[degree_north] |
latitude of the ground pixel center (WGS84) |
longitude |
float |
{time} |
[degree_east] |
longitude of the ground pixel center (WGS84) |
latitude_bounds |
float |
{time, 4} |
[degree_north] |
latitudes of the ground pixel corners (WGS84) |
longitude_bounds |
float |
{time, 4} |
[degree_east] |
longitudes of the ground pixel corners (WGS84) |
sensor_latitude |
float |
{time} |
[degree_north] |
latitude of the geodetic sub-satellite point (WGS84) |
sensor_longitude |
float |
{time} |
[degree_east] |
longitude of the goedetic sub-satellite point (WGS84) |
sensor_altitude |
float |
{time} |
[m] |
altitude of the satellite with respect to the geodetic sub-satellite point (WGS84) |
solar_zenith_angle |
float |
{time} |
[degree] |
zenith angle of the Sun at the ground pixel location (WGS84); angle measured away from the vertical |
solar_azimuth_angle |
float |
{time} |
[degree] |
azimuth angle of the Sun at the ground pixel location (WGS84); angle measured East-of-North |
sensor_zenith_angle |
float |
{time} |
[degree] |
zenith angle of the satellite at the ground pixel location (WGS84); angle measured away from the vertical |
sensor_azimuth_angle |
float |
{time} |
[degree] |
azimuth angle of the satellite at the ground pixel location (WGS84); angle measured East-of-North |
pressure |
double |
{time, vertical} |
[Pa] |
pressure |
tropospheric_HCHO_column_number_density |
float |
{time} |
[mol/m^2] |
tropospheric HCHO column number density |
tropospheric_HCHO_column_number_density_uncertainty_random |
float |
{time} |
[mol/m^2] |
uncertainty of the tropospheric HCHO column number density due to random effects |
tropospheric_HCHO_column_number_density_uncertainty_systematic |
float |
{time} |
[mol/m^2] |
uncertainty of the tropospheric HCHO column number density due to systematic effects |
tropospheric_HCHO_column_number_density_validity |
int8 |
{time} |
continuous quality descriptor, varying between 0 (no data) and 100 (full quality data) |
|
tropospheric_HCHO_column_number_density_avk |
float |
{time, vertical} |
[] |
averaging kernel for the tropospheric HCHO column number density |
HCHO_volume_mixing_ratio_dry_air_apriori |
float |
{time, vertical} |
[ppv] |
HCHO apriori profile in volume mixing ratios (with regard to dry air) |
tropospheric_HCHO_column_number_density_amf |
float |
{time} |
[] |
tropospheric air mass factor |
tropospheric_HCHO_column_number_density_amf_uncertainty_random |
float |
{time} |
[] |
random part of the tropospheric air mass factor uncertainty |
tropospheric_HCHO_column_number_density_amf_uncertainty_systematic |
float |
{time} |
[] |
systematic part of the tropospheric air mass factor uncertainty |
HCHO_slant_column_number_density |
float |
{time} |
[mol/m^2] |
HCHO slant column number density |
HCHO_slant_column_number_density_uncertainty |
float |
{time} |
[mol/m^2] |
uncertainty of the HCHO slant column number density |
absorbing_aerosol_index |
float |
{time} |
[] |
aerosol index |
cloud_albedo |
float |
{time} |
[] |
cloud albedo |
cloud_albedo_uncertainty |
float |
{time} |
[] |
uncertainty of the cloud albedo |
cloud_fraction |
float |
{time} |
[] |
cloud fraction |
cloud_fraction_uncertainty |
float |
{time} |
[] |
uncertainty of the cloud fraction |
cloud_height |
float |
{time} |
[km] |
cloud height |
cloud_height_uncertainty |
float |
{time} |
[km] |
uncertainty of the cloud height |
cloud_pressure |
float |
{time} |
[Pa] |
cloud pressure |
cloud_pressure_uncertainty |
float |
{time} |
[Pa] |
uncertainty of the cloud pressure |
surface_albedo |
float |
{time} |
[] |
surface albedo |
surface_altitude |
float |
{time} |
[m] |
surface altitude |
surface_altitude_uncertainty |
float |
{time} |
[m] |
surface altitude precision |
surface_pressure |
float |
{time} |
[Pa] |
surface pressure |
surface_meridional_wind_velocity |
float |
{time} |
[m/s] |
northward wind |
surface_zonal_wind_velocity |
float |
{time} |
[m/s] |
eastward wind |
tropopause_pressure |
double |
{time} |
[Pa] |
tropopause pressure |
index |
int32 |
{time} |
zero-based index of the sample within the source product |
Ingestion options
The table below lists the available ingestion options for S5P_L2_HCHO products.
option name |
legal values |
description |
|---|---|---|
amf |
clear_sky |
whether to ingest the default amf, vertical column and avk (default) or the clear sky amf, scaled vertical column, and omit the avk (amf=clear_sky) |
cloud_fraction |
radiance |
whether to ingest the cloud fraction (default) or the radiance cloud fraction (cloud_fraction=radiance) |
Mapping description
The table below details where and how each variable was retrieved from the input product.
field name |
mapping description |
|
|---|---|---|
scan_subindex |
description |
the scanline and pixel dimensions are collapsed into a temporal dimension; the index of the pixel within the scanline is computed as the index on the temporal dimension modulo the number of scanlines |
datetime_start |
path |
/PRODUCT/time, /PRODUCT/delta_time[] |
description |
time converted from milliseconds since a reference time (given as seconds since 2010-01-01) to seconds since 2010-01-01 (using 86400 seconds per day) |
|
datetime_length |
path |
/@time_coverage_resolution |
description |
the measurement length is parsed assuming the ISO 8601 ‘PT%(interval_seconds)fS’ format |
|
orbit_index |
path |
/@orbit |
validity |
path |
/PRODUCT/SUPPORT_DATA/DETAILED_RESULTS/processing_quality_flags[] |
description |
the uint32 data is cast to int32 |
|
latitude |
path |
/PRODUCT/latitude[] |
longitude |
path |
/PRODUCT/longitude[] |
latitude_bounds |
path |
/PRODUCT/SUPPORT_DATA/GEOLOCATIONS/latitude_bounds[] |
longitude_bounds |
path |
/PRODUCT/SUPPORT_DATA/GEOLOCATIONS/longitude_bounds[] |
sensor_latitude |
path |
/PRODUCT/SUPPORT_DATA/GEOLOCATIONS/satellite_latitude[] |
description |
the satellite latitude associated with a scanline is repeated for each pixel in the scanline |
|
sensor_longitude |
path |
/PRODUCT/SUPPORT_DATA/GEOLOCATIONS/satellite_longitude[] |
description |
the satellite longitude associated with a scanline is repeated for each pixel in the scanline |
|
sensor_altitude |
path |
/PRODUCT/SUPPORT_DATA/GEOLOCATIONS/satellite_altitude[] |
description |
the satellite altitude associated with a scanline is repeated for each pixel in the scanline |
|
solar_zenith_angle |
path |
/PRODUCT/SUPPORT_DATA/GEOLOCATIONS/solar_zenith_angle[] |
solar_azimuth_angle |
path |
/PRODUCT/SUPPORT_DATA/GEOLOCATIONS/solar_azimuth_angle[] |
sensor_zenith_angle |
path |
/PRODUCT/SUPPORT_DATA/GEOLOCATIONS/viewing_zenith_angle[] |
sensor_azimuth_angle |
path |
/PRODUCT/SUPPORT_DATA/GEOLOCATIONS/viewing_azimuth_angle[] |
pressure |
path |
/PRODUCT/SUPPORT_DATA/INPUT_DATA/tm5_constant_a[], /PRODUCT/SUPPORT_DATA/INPUT_DATA/tm5_constant_b[], /PRODUCT/SUPPORT_DATA/INPUT_DATA/surface_pressure[] |
description |
pressure in Pa at layer k is derived from surface pressure in Pa as: tm5_constant_a[k] + tm5_constant_b[k] * surface_pressure[] |
|
tropospheric_HCHO_column_number_density |
condition |
amf unset |
path |
/PRODUCT/formaldehyde_tropospheric_vertical_column[] |
|
condition |
amf=clear_sky |
|
path |
/PRODUCT/formaldehyde_tropospheric_vertical_column[], /PRODUCT/SUPPORT_DATA/DETAILED_RESULTS/formaldehyde_tropospheric_air_mass_factor[], /PRODUCT/SUPPORT_DATA/DETAILED_RESULTS/formaldehyde_clear_air_mass_factor[] |
|
description |
vertical_column = formaldehyde_tropospheric_vertical_column * formaldehyde_tropospheric_air_mass_factor / formaldehyde_clear_air_mass_factor |
|
tropospheric_HCHO_column_number_density_uncertainty_random |
condition |
amf unset |
path |
/PRODUCT/formaldehyde_tropospheric_vertical_column_precision[] |
|
condition |
amf=clear_sky |
|
path |
/PRODUCT/formaldehyde_tropospheric_vertical_column_precision[], /PRODUCT/SUPPORT_DATA/DETAILED_RESULTS/formaldehyde_tropospheric_air_mass_factor[], /PRODUCT/SUPPORT_DATA/DETAILED_RESULTS/formaldehyde_clear_air_mass_factor[] |
|
description |
uncertainty_random = formaldehyde_tropospheric_vertical_column_precision * formaldehyde_tropospheric_air_mass_factor / formaldehyde_clear_air_mass_factor |
|
tropospheric_HCHO_column_number_density_uncertainty_systematic |
path |
/PRODUCT/SUPPORT_DATA/DETAILED_RESULTS/formaldehyde_tropospheric_vertical_column_trueness[] |
tropospheric_HCHO_column_number_density_validity |
path |
/PRODUCT/qa_value |
tropospheric_HCHO_column_number_density_avk |
available |
optional |
condition |
amf unset and processor version < 02.00.00 |
|
path |
/PRODUCT/SUPPORT_DATA/DETAILED_RESULTS/averaging_kernel[] |
|
condition |
amf unset and processor version >= 02.00.00 |
|
path |
/PRODUCT/SUPPORT_DATA/DETAILED_RESULTS/averaging_kernel[], /PRODUCT/SUPPORT_DATA/INPUT_DATA/tm5_tropopause_layer_index[] |
|
description |
averaging_kernel[layer] = if layer <= tm5_tropopause_layer_index then averaging_kernel[layer] else 0 |
|
HCHO_volume_mixing_ratio_dry_air_apriori |
available |
optional |
condition |
NRTI or processor version >= 01.00.00 |
|
path |
/PRODUCT/SUPPORT_DATA/DETAILED_RESULTS/formaldehyde_profile_apriori[] |
|
tropospheric_HCHO_column_number_density_amf |
condition |
amf unset |
path |
/PRODUCT/SUPPORT_DATA/DETAILED_RESULTS/formaldehyde_tropospheric_air_mass_factor[] |
|
condition |
amf=clear_sky |
|
path |
/PRODUCT/SUPPORT_DATA/DETAILED_RESULTS/formaldehyde_clear_air_mass_factor[] |
|
tropospheric_HCHO_column_number_density_amf_uncertainty_random |
path |
/PRODUCT/SUPPORT_DATA/DETAILED_RESULTS/formaldehyde_tropospheric_air_mass_factor_precision[] |
tropospheric_HCHO_column_number_density_amf_uncertainty_systematic |
path |
/PRODUCT/SUPPORT_DATA/DETAILED_RESULTS/formaldehyde_tropospheric_air_mass_factor_trueness[] |
HCHO_slant_column_number_density |
path |
/PRODUCT/SUPPORT_DATA/DETAILED_RESULTS/formaldehyde_slant_column_corrected[] |
HCHO_slant_column_number_density_uncertainty |
path |
/PRODUCT/SUPPORT_DATA/DETAILED_RESULTS/formaldehyde_slant_column_corrected_trueness[] |
absorbing_aerosol_index |
available |
optional |
condition |
OFFL |
|
path |
/PRODUCT/SUPPORT_DATA/INPUT_DATA/aerosol_index_340_380 |
|
cloud_albedo |
path |
/PRODUCT/SUPPORT_DATA/INPUT_DATA/cloud_albedo_crb |
cloud_albedo_uncertainty |
path |
/PRODUCT/SUPPORT_DATA/INPUT_DATA/cloud_albedo_crb_precision |
cloud_fraction |
condition |
cloud_fraction unset |
path |
/PRODUCT/SUPPORT_DATA/INPUT_DATA/cloud_fraction_crb[] |
|
condition |
cloud_fraction=radiance |
|
path |
/PRODUCT/SUPPORT_DATA/DETAILED_RESULTS/cloud_fraction_intensity_weighted[] |
|
cloud_fraction_uncertainty |
condition |
cloud_fraction unset |
path |
/PRODUCT/SUPPORT_DATA/INPUT_DATA/cloud_fraction_crb_precision[] |
|
condition |
cloud_fraction=radiance |
|
path |
/PRODUCT/SUPPORT_DATA/DETAILED_RESULTS/cloud_fraction_intensity_weighted_precision[] |
|
cloud_height |
path |
/PRODUCT/SUPPORT_DATA/INPUT_DATA/cloud_height_crb |
cloud_height_uncertainty |
path |
/PRODUCT/SUPPORT_DATA/INPUT_DATA/cloud_height_crb_precision |
cloud_pressure |
path |
/PRODUCT/SUPPORT_DATA/INPUT_DATA/cloud_pressure_crb |
cloud_pressure_uncertainty |
path |
/PRODUCT/SUPPORT_DATA/INPUT_DATA/cloud_pressure_crb_precision |
surface_albedo |
path |
/PRODUCT/SUPPORT_DATA/INPUT_DATA/surface_albedo |
surface_altitude |
path |
/PRODUCT/SUPPORT_DATA/INPUT_DATA/surface_altitude[] |
surface_altitude_uncertainty |
path |
/PRODUCT/SUPPORT_DATA/INPUT_DATA/surface_altitude_precision[] |
surface_pressure |
path |
/PRODUCT/SUPPORT_DATA/INPUT_DATA/surface_pressure[] |
surface_meridional_wind_velocity |
available |
optional |
condition |
processor version >= 02.00.00 |
|
path |
/PRODUCT/SUPPORT_DATA/INPUT_DATA/northward_wind[] |
|
surface_zonal_wind_velocity |
available |
optional |
condition |
processor version >= 02.00.00 |
|
path |
/PRODUCT/SUPPORT_DATA/INPUT_DATA/eastward_wind[] |
|
tropopause_pressure |
available |
optional |
condition |
processor version >= 02.00.00 |
|
path |
/PRODUCT/SUPPORT_DATA/INPUT_DATA/tm5_constant_a[], /PRODUCT/SUPPORT_DATA/INPUT_DATA/tm5_constant_b[], /PRODUCT/SUPPORT_DATA/INPUT_DATA/tm5_tropopause_layer_index[], /PRODUCT/SUPPORT_DATA/INPUT_DATA/surface_pressure[] |
|
description |
pressure in Pa at tropause is derived from the upper bound of the layer with tropopause layer index k: exp((log(tm5_constant_a[k] + tm5_constant_b[k] * surface_pressure[]) + log(tm5_constant_a[k + 1] + tm5_constant_b[k + 1] * surface_pressure[]))/2.0) |
|