# ECA_ATL_CTH_2A

## Variables

The table below lists the variables that are present in the HARP product that results from an ingestion of `ECA_ATL_CTH_2A` 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
cloud_top_height | float | {time} | [m] | ATLID cloud top height
cloud_top_height_uncertainty | float | {time} | [m] | ATLID cloud top height confidence
cloud_type | int8 | {time} |  | simplified uppermost cloud classification
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
cloud_top_height | path | /ScienceData/ATLID_cloud_top_height
cloud_top_height_uncertainty | path | /ScienceData/ATLID_cloud_top_height_confidence
cloud_type | path | /ScienceData/simplified_uppermost_cloud_classification
validity | path | /ScienceData/quality_status