S5P_PAL_L2_AER_OT

Variables

The table below lists the variables that are present in the HARP product that results from an ingestion of S5P_PAL_L2_AER_OT 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

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}

[]

Geometrical cloud fraction from NPP-VIIRS regridded observations. Geometrical cloud fraction is defined as (probably+confidently cloudy)/(total) for nominal footprint.

surface_pressure

float

{time}

[Pa]

surface air 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)

absorbing_aerosol_index

float

{time}

[]

Absorbing aerosol index at 340 and 380 nm.

wind_speed

float

{time}

[m/s]

absolute wind speed computed from the wind vector at 10 meter height level

aerosol_optical_depth

float

{time, spectral}

[]

total aerosol optical thickness of the atmospheric column

aerosol_optical_depth_uncertainty

float

{time, spectral}

[]

precision of the total aerosol optical thickness of the atmospheric column

aerosol_optical_depth_validity

int8

{time, spectral}

continuous quality descriptor, varying between 0 (no data) and 100 (full quality data)

single_scattering_albedo

float

{time, spectral}

[]

Single scattering albedo; fraction of the aerosol scattering and absorption, according to the selected aerosol type.

aerosol_type

int32

{time}

selected aerosol type

wavelength

float

{spectral}

[nm]

wavelength

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

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/SUPPORT_DATA/INPUT_DATA/cloud_fraction

description

if AOT product was generated with VIIRS input data

path

/PRODUCT/SUPPORT_DATA/INPUT_DATA/effective_cloud_fraction

description

if AOT product was not generated with VIIRS input data

surface_pressure

path

/PRODUCT/SUPPORT_DATA/INPUT_DATA/surface_pressure[]

snow_ice_type

path

/PRODUCT/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

path

/PRODUCT/SUPPORT_DATA/INPUT_DATA/snow_ice_flag[]

description

if 1 <= snow_ice_flag <= 100 then snow_ice_flag/100.0 else 0.0

absorbing_aerosol_index

path

/PRODUCT/SUPPORT_DATA/INPUT_DATA/absorbing_aerosol_index[]

wind_speed

path

/PRODUCT/SUPPORT_DATA/INPUT_DATA/wind_speed[]

aerosol_optical_depth

path

/PRODUCT/aerosol_optical_thickness

aerosol_optical_depth_uncertainty

available

optional

condition

processor version >= 02.00.00

path

/PRODUCT/aerosol_optical_thickness_precision

aerosol_optical_depth_validity

path

/PRODUCT/qa_value

single_scattering_albedo

condition

processor version < 02.00.00

path

/PRODUCT/single_scattering_albedo

condition

processor version >= 02.00.00

path

/PRODUCT/SUPPORT_DATA/DETAILED_RESULTS/single_scattering_albedo

aerosol_type

path

/PRODUCT/aerosol_type

wavelength

path

/PRODUCT/wavelength