S5_L2_CH4
Variables
The table below lists the variables that are present in the HARP product that results from an ingestion of S5_L2_CH4 data.
field name |
type |
dimensions |
unit |
description |
|---|---|---|---|---|
datetime_start |
double |
{time} |
[seconds since 2010-01-01] |
start time 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] |
the four latitude boundaries of each ground pixel |
longitude_bounds |
float |
{time, 4} |
[degree_east] |
the four longitude boundaries of each ground pixel |
sensor_latitude |
float |
{time} |
[degree_north] |
latitude of the spacecraft sub-satellite point on the WGS84 reference ellipsoid |
sensor_longitude |
float |
{time} |
[degree_east] |
longitude of the spacecraft sub-satellite point on the WGS84 reference ellipsoid |
sensor_altitude |
float |
{time} |
[m] |
altitude of the spacecraft relative to the WGS84 reference ellipsoid. |
sensor_orbit_phase |
double |
{time} |
[] |
relative offset (0.0 … 1.0) of the measurement in the orbit. |
solar_zenith_angle |
float |
{time} |
[degree] |
zenith angle of the sun measured from the ground pixel location on the WGS84 reference ellipsoid |
solar_azimuth_angle |
float |
{time} |
[degree] |
azimuth angle of the sun measured from the ground pixel location on the WGS84 ellipsoid |
sensor_zenith_angle |
float |
{time} |
[degree] |
zenith angle of the spacecraft measured from the ground pixel location on the WGS84 reference ellipsoid |
sensor_azimuth_angle |
float |
{time} |
[degree] |
azimuth angle of the spacecraft measured from the ground pixel WGS84 reference ellipsoid |
surface_altitude |
float |
{time} |
[m] |
height of the surface above WGS84 ellipsoid averaged over the S5 pixel |
surface_altitude_uncertainty |
float |
{time} |
[m] |
standard deviation of the height of the surface above WGS84 ellipsoid averaged over the S5 pixel |
surface_pressure |
float |
{time} |
[Pa] |
surface pressure; from ECMWF and adjusted for surface elevation |
surface_type |
int32 |
{time} |
surface classification |
|
snow_ice_type |
int32 |
{time} |
surface condition (snow/ice); enumeration values: snow_free_land (0), sea_ice (1), permanent_ice (2), snow (3), ocean (4) |
|
sea_ice_fraction |
float |
{time} |
[] |
sea-ice concentration (as a fraction) |
CH4_column_volume_mixing_ratio_dry_air |
float |
{time} |
[ppbv] |
physics CH4 dry air column mixing ratio |
CH4_column_volume_mixing_ratio_dry_air_uncertainty |
float |
{time} |
[ppbv] |
physics CH4 dry air column mixing ratio noise estimate |
CH4_column_volume_mixing_ratio_dry_air_validity |
int32 |
{time} |
quality assurance value describing the quality of the product |
|
pressure |
float |
{time, vertical} |
[Pa] |
pressure grid |
altitude |
float |
{time, vertical} |
[m] |
altitude grid |
dry_air_column_number_density |
float |
{time} |
[mol/m2] |
column number density profile of dry air |
CH4_column_number_density_apriori |
float |
{time, vertical} |
[mol/m2] |
a-priori CH4 profile |
CO2_column_number_density_apriori |
float |
{time, vertical} |
[mol/m2] |
a-priori CO2 profile |
O2_column_number_density_apriori |
float |
{time} |
[mol/m2] |
a-priori O2 column |
H2O_column_number_density_apriori |
float |
{time} |
[mol/m2] |
a-priori H2O column |
solar_induced_fluorescence |
float |
{time, spectral} |
[] |
solar induced fluorescence |
CH4_column_number_density_avk |
float |
{time, vertical} |
[] |
physics CH4 column averaging kernel |
H2O_column_number_density |
float |
{time} |
[mol/m^2] |
H2O column |
CO2_column_number_density |
float |
{time} |
[mol/m^2] |
CO2 column |
CO_column_number_density |
float |
{time} |
[mol/m^2] |
CO column |
aerosol_effective_radius |
float |
{time} |
[m] |
aerosol particle size |
aerosol_column_number_density |
float |
{time} |
[mol/m^2] |
Aerosol particle column |
aerosol_height |
float |
{time} |
[m] |
aerosol layer height above the surface |
surface_albedo |
float |
{time} |
[] |
surface albedo in the selected band |
index |
int32 |
{time} |
zero-based index of the sample within the source product |
Ingestion options
The table below lists the available ingestion options for S5_L2_CH4 products.
option name |
legal values |
description |
|---|---|---|
ch4 |
physics, proxy |
which CH4 column to ingest: ‘physics’ (default physics-based column) or ‘proxy’ (alternate proxy column) |
band |
SWIR-1, SWIR-3, NIR-2 |
Choose which surface albedo to ingest: SWIR-1 (default), SWIR-3, or NIR-2 |
Mapping description
The table below details where and how each variable was retrieved from the input product.
field name |
mapping description |
|
|---|---|---|
datetime_start |
path |
/data/PRODUCT/time, /data/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) |
|
orbit_index |
path |
/@orbit_start |
validity |
path |
/data/PRODUCT/processing_quality_flags[] |
description |
the uint64 data is cast to int32 |
|
latitude |
path |
/data/PRODUCT/SUPPORT_DATA/GEOLOCATIONS/latitude[] |
longitude |
path |
/data/PRODUCT/SUPPORT_DATA/GEOLOCATIONS/longitude[] |
latitude_bounds |
path |
/data/PRODUCT/SUPPORT_DATA/GEOLOCATIONS/latitude_bounds[] |
longitude_bounds |
path |
/data/PRODUCT/SUPPORT_DATA/GEOLOCATIONS/longitude_bounds[] |
sensor_latitude |
path |
/data/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 |
/data/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 |
/data/PRODUCT/SUPPORT_DATA/GEOLOCATIONS/satellite_altitude[] |
description |
the satellite altitude associated with a scanline is repeated for each pixel in the scanline |
|
sensor_orbit_phase |
path |
/data/PRODUCT/SUPPORT_DATA/GEOLOCATIONS/satellite_orbit_phase[] |
solar_zenith_angle |
path |
/data/PRODUCT/SUPPORT_DATA/GEOLOCATIONS/solar_zenith_angle[] |
solar_azimuth_angle |
path |
/data/PRODUCT/SUPPORT_DATA/GEOLOCATIONS/solar_azimuth_angle[] |
sensor_zenith_angle |
path |
/data/PRODUCT/SUPPORT_DATA/GEOLOCATIONS/viewing_zenith_angle[] |
sensor_azimuth_angle |
path |
/data/PRODUCT/SUPPORT_DATA/GEOLOCATIONS/viewing_azimuth_angle[] |
surface_altitude |
path |
/data/PRODUCT/SUPPORT_DATA/INPUT_DATA/surface_altitude[] |
surface_altitude_uncertainty |
path |
data/PRODUCT/SUPPORT_DATA/INPUT_DATA/surface_altitude_precision[] |
surface_pressure |
path |
data/PRODUCT/SUPPORT_DATA/INPUT_DATA/surface_pressure[] |
surface_type |
path |
/data/PRODUCT/SUPPORT_DATA/INPUT_DATA/surface_classification[] |
snow_ice_type |
condition |
band=band3a or band unset |
path |
/data/PRODUCT_BAND3A/SUPPORT_DATA/INPUT_DATA/snow_ice_flag[] |
|
description |
0: snow_free_land (0), 1-100: sea_ice (1), 101: permanent_ice (2), 103: snow (3), 255: ocean (4), other values map to -1 |
|
condition |
band=band3c |
|
path |
/data/PRODUCT_BAND3C/SUPPORT_DATA/INPUT_DATA/snow_ice_flag[] |
|
description |
0: snow_free_land (0), 1-100: sea_ice (1), 101: permanent_ice (2), 103: snow (3), 255: ocean (4), other values map to -1 |
|
sea_ice_fraction |
condition |
band=band3a or band unset |
path |
/data/PRODUCT_BAND3A/SUPPORT_DATA/INPUT_DATA/snow_ice_flag[] |
|
description |
if 1 <= snow_ice_flag <= 100 then snow_ice_flag/100.0 else 0.0 |
|
condition |
band=band3c |
|
path |
/data/PRODUCT_BAND3C/SUPPORT_DATA/INPUT_DATA/snow_ice_flag[] |
|
description |
if 1 <= snow_ice_flag <= 100 then snow_ice_flag/100.0 else 0.0 |
|
CH4_column_volume_mixing_ratio_dry_air |
condition |
ch4=physics |
path |
data/PRODUCT/methane_dry_air_column_mixing_ratio_physics[] |
|
condition |
ch4=proxy |
|
path |
data/PRODUCT/methane_dry_air_column_mixing_ratio_proxy[] |
|
CH4_column_volume_mixing_ratio_dry_air_uncertainty |
condition |
ch4=physics |
path |
data/PRODUCT/methane_dry_air_column_mixing_ratio_precision_physics[] |
|
condition |
ch4=proxy |
|
path |
data/PRODUCT/methane_dry_air_column_mixing_ratio_precision_proxy[] |
|
CH4_column_volume_mixing_ratio_dry_air_validity |
path |
data/PRODUCT/qa_value |
pressure |
path |
data/PRODUCT/SUPPORT_DATA/DETAILED_RESULTS/pressure[] |
description |
the vertical grid is inverted to make it ascending |
|
altitude |
path |
data/PRODUCT/SUPPORT_DATA/DETAILED_RESULTS/altitude[] |
description |
the vertical grid is inverted to make it ascending |
|
dry_air_column_number_density |
path |
data/PRODUCT/SUPPORT_DATA/DETAILED_RESULTS/dry_air_column[] |
CH4_column_number_density_apriori |
path |
data/PRODUCT/SUPPORT_DATA/DETAILED_RESULTS/methane_profile_apriori[] |
description |
the vertical grid is inverted to make it ascending |
|
CO2_column_number_density_apriori |
path |
data/PRODUCT/SUPPORT_DATA/DETAILED_RESULTS/carbon_dioxide_profile_apriori[] |
description |
the vertical grid is inverted to make it ascending |
|
O2_column_number_density_apriori |
path |
data/PRODUCT/SUPPORT_DATA/DETAILED_RESULTS/oxygen_total_column_apriori[] |
H2O_column_number_density_apriori |
path |
data/PRODUCT/SUPPORT_DATA/DETAILED_RESULTS/water_total_column_apriori[] |
solar_induced_fluorescence |
path |
data/PRODUCT/SUPPORT_DATA/DETAILED_RESULTS/solar_induced_fluorescence[] |
description |
the spectral grid is inverted to make it ascending |
|
CH4_column_number_density_avk |
path |
data/PRODUCT/SUPPORT_DATA/DETAILED_RESULTS/methane_total_column_averaging_kernel[] |
description |
the vertical grid is inverted to make it ascending |
|
H2O_column_number_density |
path |
data/PRODUCT/SUPPORT_DATA/DETAILED_RESULTS/water_total_column[] |
CO2_column_number_density |
path |
data/PRODUCT/SUPPORT_DATA/DETAILED_RESULTS/carbon_dioxide_total_column[] |
CO_column_number_density |
path |
data/PRODUCT/SUPPORT_DATA/DETAILED_RESULTS/carbon_monoxide_total_column[] |
aerosol_effective_radius |
path |
data/PRODUCT/SUPPORT_DATA/DETAILED_RESULTS/aerosol_size[] |
aerosol_column_number_density |
path |
data/PRODUCT/SUPPORT_DATA/DETAILED_RESULTS/aerosol_particle_column[] |
aerosol_height |
path |
data/PRODUCT/SUPPORT_DATA/DETAILED_RESULTS/aerosol_layer_height[] |
surface_albedo |
condition |
band=SWIR-1 |
path |
data/PRODUCT/SUPPORT_DATA/DETAILED_RESULTS/surface_albedo_swir_1[] |
|
condition |
band=SWIR-3 |
|
path |
data/PRODUCT/SUPPORT_DATA/DETAILED_RESULTS/surface_albedo_swir_3[] |
|
condition |
band=NIR-2 |
|
path |
data/PRODUCT/SUPPORT_DATA/DETAILED_RESULTS/surface_albedo_nir_2[] |
|