# ECA_ACM_CAP_2B

## Variables

The table below lists the variables that are present in the HARP product that results from an ingestion of `ECA_ACM_CAP_2B` 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
altitude | float | {time, vertical} | [m] | joint standard grid height
liquid_water_density | float | {time, vertical} | [kg/m3] | liquid water content
liquid_water_extinction_coefficient | float | {time, vertical} | [1/m] | liquid extinction
liquid_particle_effective_radius | float | {time, vertical} | [m] | liquid effective radius
ice_water_density | float | {time, vertical} | [kg/m3] | ice water content
ice_particle_effective_radius | float | {time, vertical} | [m] | ice effective radius
ice_water_mass_flux | float | {time, vertical} | [kg/m2/s] | ice mass flux
ice_water_column_density | float | {time} | [kg/m2] | ice water path
rain_rate | float | {time, vertical} | [mm/h] | rain rate
rain_water_density | float | {time, vertical} | [kg/m3] | rain water content
aerosol_number_density | float | {time, vertical} | [1/m3] | aerosol number concentration
aerosol_extinction_coefficient | float | {time, vertical} | [1/m] | aerosol extinction
aerosol_optical_depth | float | {time} | [] | aerosol optical depth
aerosol_density | float | {time, vertical} | [kg/m3] | aerosol mass content
validity | int8 | {time} |  | quality status
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
--- | ---
datetime | path | /ScienceData/time
latitude | path | /ScienceData/latitude
longitude | path | /ScienceData/longitude
orbit_index | path | /HeaderData/VariableProductHeader/MainProductHeader/orbitNumber
altitude | path | /ScienceData/height, /ScienceData/geoid_offset
description | the vertical grid is inverted to make it ascending; altitude[i,j] = height[i,j] - geoid_offset[i]
liquid_water_density | path | /ScienceData/liquid_water_content
description | the vertical grid is inverted to make it ascending
liquid_water_extinction_coefficient | path | /ScienceData/liquid_extinction
description | the vertical grid is inverted to make it ascending
liquid_particle_effective_radius | path | /ScienceData/liquid_effective_radius
description | the vertical grid is inverted to make it ascending
ice_water_density | path | /ScienceData/ice_water_content
description | the vertical grid is inverted to make it ascending
ice_particle_effective_radius | path | /ScienceData/ice_effective_radius
description | the vertical grid is inverted to make it ascending
ice_water_mass_flux | path | /ScienceData/ice_mass_flux
description | the vertical grid is inverted to make it ascending
ice_water_column_density | path | /ScienceData/ice_water_path
rain_rate | path | /ScienceData/rain_rate
description | the vertical grid is inverted to make it ascending
rain_water_density | path | /ScienceData/rain_water_content
description | the vertical grid is inverted to make it ascending
aerosol_number_density | path | /ScienceData/aerosol_number_concentration
description | the vertical grid is inverted to make it ascending
aerosol_extinction_coefficient | path | /ScienceData/aerosol_extinction
description | the vertical grid is inverted to make it ascending
aerosol_optical_depth | path | /ScienceData/aerosol_optical_depth
aerosol_density | path | /ScienceData/aerosol_mass_content
description | the vertical grid is inverted to make it ascending
validity | path | /ScienceData/quality_status