S5P_L2_FRESCO
Variables
The table below lists the variables that are present in the HARP product that results from an ingestion of S5P_L2_FRESCO 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 |
| cloud_fraction | float | {time} | [] | effective cloud fraction retrieved from the O2 A-band |
| cloud_fraction_uncertainty | float | {time} | [] | uncertainty of the effective cloud fraction |
| cloud_fraction_validity | int8 | {time} | continuous quality descriptor, varying between 0 (no data) and 1 (full quality data) | |
| cloud_pressure | float | {time} | [Pa] | cloud optical centroid pressure retrieved from the O2 A-band |
| cloud_pressure_uncertainty | float | {time} | [Pa] | uncertainty of the cloud optical centroid pressure |
| cloud_height | float | {time} | [m] | cloud optical centroid altitude |
| cloud_height_uncertainty | float | {time} | [m] | uncertainty of the cloud optical centroid altitude |
| cloud_albedo | float | {time} | [] | cloud albedo; this is a fixed value for FRESCO |
| cloud_albedo_uncertainty | float | {time} | [] | cloud albedo error; since cloud albedo is fixed for FRESCO, this value is set to NaN |
| surface_albedo | float | {time} | [] | assumed surface albedo at 758nm |
| surface_altitude | float | {time} | [m] | surface altitude |
| surface_altitude_uncertainty | float | {time} | [m] | surface altitude precision |
| surface_pressure | float | {time} | [Pa] | surface pressure |
| snow_ice_type | int8 | {time} | surface snow/ice type; 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) |
| index | int32 | {time} | zero-based index of the sample within the source product |
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); the time associated with a scanline is repeated for each pixel in the scanline | |
| 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[] |
| cloud_fraction | path | /PRODUCT/cloud_fraction_crb[] |
| cloud_fraction_uncertainty | path | /PRODUCT/cloud_fraction_crb_precision[] |
| cloud_fraction_validity | path | /PRODUCT/qa_value |
| cloud_pressure | path | /PRODUCT/cloud_pressure_crb[] |
| cloud_pressure_uncertainty | path | /PRODUCT/cloud_pressure_crb_precision[] |
| cloud_height | path | /PRODUCT/cloud_height_crb[] |
| cloud_height_uncertainty | path | /PRODUCT/cloud_height_crb_precision[] |
| cloud_albedo | path | /PRODUCT/cloud_albedo_crb[] |
| cloud_albedo_uncertainty | path | /PRODUCT/cloud_albedo_crb_precision[] |
| surface_albedo | path | /PRODUCT/SUPPORT_DATA/INPUT_DATA/surface_albedo_assumed[] |
| surface_altitude | path | /PRODUCT/SUPPORT_DATA/INPUT_DATA/surface_altitude[] |
| surface_altitude_uncertainty | path | /PRODUCT/SUPPORT_DATA/INPUT_DATA/surface_altitude_precision[] |
| surface_pressure | available | optional |
| condition | processor version >= 01.00.00 | |
| path | /PRODUCT/SUPPORT_DATA/INPUT_DATA/surface_pressure[] | |
| snow_ice_type | path | /PRODUCT/SUPPORT_DATA/DETAILED_RESULTS/snow_ice_flag_nise[] |
| 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 | path | /PRODUCT/SUPPORT_DATA/DETAILED_RESULTS/snow_ice_flag_nise[] |
| description | if 1 <= snow_ice_flag <= 100 then snow_ice_flag/100.0 else 0.0 | |