# ECA_BBR_SNG_1B

## Variables

The table below lists the variables that are present in the HARP product that results from an ingestion of `ECA_BBR_SNG_1B` data.

field name | type | dimensions | unit | description
--- | --- | --- | --- | ---
datetime | double | {time} | [seconds since 2000-01-01] | UTC time
latitude | double | {time} | [degree_north] | Geodetic latitude
longitude | double | {time} | [degree_east] | Geodetic longitude
orbit_index | int32 |  |  | absolute orbit number
solar_azimuth_angle | double | {time} | [degree] | solar azimuth angle
solar_elevation_angle | double | {time} | [degree] | solar elevation angle
sensor_azimuth_angle | double | {time} | [degree] | sensor azimuth angle
sensor_elevation_angle | double | {time} | [degree] | sensor elevation angle
radiance | double | {time} | [W/m2/sr] | radiance
radiance_uncertainty | double | {time} | [W/m2/sr] | radiance
validity | int8 | {time} |  | invalid data flag
index | int32 | {time} |  | zero-based index of the sample within the source product

## Ingestion options

The table below lists the available ingestion options for `ECA_BBR_SNG_1B` products.

option name | legal values | description
--- | --- | ---
direction | fore, aft | viewing direction: nadir (default), fore (direction=fore), aft (direction=aft)
band | LW | band: SW (default), LW (band=LW)

## Mapping description

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

field name | mapping description
--- | ---
datetime | path | /ScienceData/time[<direction>,<band>,*]
description | <direction> is 0 (Aft), 1 (Nadir), or 2 (Fore) based on direction option; <band> is 0 (SW), or 1 (LW)
latitude | path | /ScienceData/latitude[<direction>,<band>,*,*]
description | <direction> is 0 (Aft), 1 (Nadir), or 2 (Fore) based on direction option; <band> is 0 (SW), or 1 (LW)
longitude | path | /ScienceData/longitude[<direction>,<band>,*,*]
description | <direction> is 0 (Aft), 1 (Nadir), or 2 (Fore) based on direction option; <band> is 0 (SW), or 1 (LW)
orbit_index | path | /HeaderData/VariableProductHeader/MainProductHeader/orbitNumber
solar_azimuth_angle | path | /ScienceData/solar_azimuth_angle[<direction>,<band>,*,*]
description | <direction> is 0 (Aft), 1 (Nadir), or 2 (Fore) based on direction option; <band> is 0 (SW), or 1 (LW)
solar_elevation_angle | path | /ScienceData/solar_elevation_angle[<direction>,<band>,*,*]
description | <direction> is 0 (Aft), 1 (Nadir), or 2 (Fore) based on direction option; <band> is 0 (SW), or 1 (LW)
sensor_azimuth_angle | path | /ScienceData/sensor_azimuth_angle[<direction>,<band>,*,*]
description | <direction> is 0 (Aft), 1 (Nadir), or 2 (Fore) based on direction option; <band> is 0 (SW), or 1 (LW)
sensor_elevation_angle | path | /ScienceData/sensor_elevation_angle[<direction>,<band>,*,*]
description | <direction> is 0 (Aft), 1 (Nadir), or 2 (Fore) based on direction option; <band> is 0 (SW), or 1 (LW)
radiance | path | /ScienceData/radiance[<direction>,<band>,*,*]
description | <direction> is 0 (Aft), 1 (Nadir), or 2 (Fore) based on direction option; <band> is 0 (SW), or 1 (LW)
radiance_uncertainty | path | /ScienceData/radiance[<direction>,<band>,*,*]
description | <direction> is 0 (Aft), 1 (Nadir), or 2 (Fore) based on direction option; <band> is 0 (SW), or 1 (LW)
validity | path | /ScienceData/invalid_flag[<direction>,<band>,*]