IAS_02_NAC

Variables

The table below lists the variables that are present in the HARP product that results from an ingestion of IAS_02_NAC data.

field name

type

dimensions

unit

description

orbit_index

int32

absolute orbit number

surface_altitude

float

{time}

[m]

Altitude of surface

validity

int8

{time}

[]

General retrieval quality flag

HNO3_column_density_validity

int32

{time}

[]

Retrieval flags

HNO3_column_density

float

{time}

[kg/m2]

integrated HNO3

datetime

double

{time}

[s since 2020-01-01]

on-board time in UTC

longitude

double

{time}

[degree_east]

geocentric longitude at sounder pixel centre

longitude_bounds

double

{time, 4}

[degree_east]

corner longitudes of the measurement

latitude

double

{time}

[degree_north]

geodetic latitude at sounder pixel centre

latitude_bounds

double

{time, 4}

[degree_north]

corner latitudes of the measurement

solar_azimuth_angle

double

{time}

[degree]

solar azimuth angle at sounder pixel centre

solar_zenith_angle

double

{time}

[degree]

solar zenith angle at sounder pixel centre

sensor_azimuth_angle

double

{time}

[degree]

measurement azimuth angle at sounder pixel centre

sensor_zenith_angle

double

{time}

[degree]

measurement zenith angle at sounder pixel centre

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

orbit_index

path

/@orbit_start

surface_altitude

path

/data/surface_z[]

validity

path

/data/hno3_qflag[]

description

the uint8 data is cast to int8

HNO3_column_density_validity

path

/data/hno3_bdiv[]

description

the uint32 data is cast to int32

HNO3_column_density

path

/data/atmosphere_mass_content_of_nitric_acid[]

datetime

path

/data/geolocation_information/onboard_utc[]

longitude

path

/data/geolocation_information/sounder_pixel_longitude[]

longitude_bounds

path

/data/geolocation_information/sounder_pixel_longitude_bounds[]

description

the corner coordinates are rough estimates of the circle areas for the scan elements; the size of a scan element (in a certain direction) is taken to be half the distance, from center to center, from a scan element to its nearest neighboring scan element (within the same 2x2 subgrid inside a Field of Regard (FOR))

latitude

path

/data/geolocation_information/sounder_pixel_latitude[]

latitude_bounds

path

/data/geolocation_information/sounder_pixel_latitude_bounds[]

description

the corner coordinates are rough estimates of the circle areas for the scan elements; the size of a scan element (in a certain direction) is taken to be half the distance, from center to center, from a scan element to its nearest neighboring scan element (within the same 2x2 subgrid inside a Field of Regard (FOR))

solar_azimuth_angle

path

/data/geolocation_information/sounder_pixel_sun_azimuth[]

solar_zenith_angle

path

/data/geolocation_information/sounder_pixel_sun_zenith[]

sensor_azimuth_angle

path

/data/geolocation_information/sounder_pixel_azimuth[]

sensor_zenith_angle

path

/data/geolocation_information/sounder_pixel_zenith[]