# AEOLUS_L1B_Rayleigh

## Variables

The table below lists the variables that are present in the HARP product that results from an ingestion of AEOLUS_L1B_Rayleigh data.

field name

type

dimensions

unit

description

datetime_start

double

{time}

[seconds since 2000-01-01]

start time of the measurement

datetime_length

double

{time}

[s]

duration of the measurement

orbit_index

int32

absolute orbit number

latitude

double

{time, vertical}

[degree_north]

average of the latitudes of the edges of the height bin

longitude

double

{time, vertical}

[degree_east]

average of the longitude of the edges of the height bin

altitude_bounds

double

{time, vertical, 2}

[m]

altitude boundaries of the height bin

geoid_height

double

{time}

[m]

Geoid separation

hlos_wind_velocity

double

{time, vertical}

[m/s]

HLOS wind velocity at the altitude bin

hlos_wind_velocity_validity

int32

{time, vertical}

quality flag of the HLOS wind velocity at the altitude bin

index

int32

{time}

zero-based index of the sample within the source product

## Ingestion options

The table below lists the available ingestion options for AEOLUS_L1B products.

option name

legal values

description

data

rayleigh_measurement, mie_measurement, rayleigh_observation, mie_observation

the type of wind profile to ingest; option values are ‘rayleigh_observation’ (default), ‘mie_observation’, ‘rayleigh_measurement’, ‘mie_measurement’

This definition is only applicable when: data=rayleigh_measurement

## Mapping description

The table below details where and how each variable was retrieved from the input product.

field name

mapping description

datetime_start

path

/geolocation[]/start_of_observation_time, /sph/n_max_actual

description

start_of_observation_time + 12.0/n_max_actual * index within BRC

datetime_length

path

/sph/n_max_actual

description

set to 12.0/n_max_actual seconds

orbit_index

path

/mph/abs_orbit

latitude

path

/geolocation[]/measurement_geolocation[]/rayleigh_geolocation[]/latitude_of_height_bin

description

average of the value at the upper and lower edge of the height bin

longitude

path

/geolocation[]/measurement_geolocation[]/rayleigh_geolocation[]/longitude_of_height_bin

description

average of the value at the upper and lower edge of the height bin

altitude_bounds

path

/geolocation[]/measurement_geolocation[]/rayleigh_geolocation[]/altitude_of_height_bin, /geolocation[]/observation_geolocation/geoid_separation

description

altitude_of_height_bin minus geoid_separation (because altitude_of_height_bin is wrt WGS84)

geoid_height

path

/geolocation[]/observation_geolocation/geoid_separation

hlos_wind_velocity

path

/wind_velocity[]/measurement_wind_profile[]/rayleigh_altitude_bin_wind_info[]/wind_velocity

hlos_wind_velocity_validity

path

/wind_velocity[]/measurement_wind_profile[]/rayleigh_altitude_bin_wind_info[]/bin_quality_flag