# NPP_SUOMI_L2_VIIRS_EDR_VCTP

## Variables

The table below lists the variables that are present in the HARP product that results from an ingestion of `NPP_SUOMI_L2_VIIRS_EDR_VCTP` data.

field name | type | dimensions | unit | description
--- | --- | --- | --- | ---
datetime | double | {time} | [seconds since 2000-01-01] | time of the measurement
latitude | double | {time} | [degree_north] | tangent latitude
longitude | double | {time} | [degree_east] | tangent longitude
sensor_azimuth_angle | double | {time} | [degree] | azimuth angle (measured clockwise positive from North) to Satellite at each retrieval position
sensor_zenith_angle | double | {time} | [degree] | zenith angle to Satellite at each retrieval position
solar_azimuth_angle | double | {time} | [degree] | azimuth angle of sun (measured clockwise positive from North) at each retrieval position
solar_zenith_angle | double | {time} | [degree] | zenith angle of sun at each retrieval position
cloud_base_height | double | {time} | [km] | cloud_base_height
cloud_top_height | double | {time} | [km] | cloud_top_height
cloud_top_pressure | double | {time} | [hPa] | cloud_top_pressure
cloud_top_temperature | double | {time} | [K] | cloud_top_temperature
cloud_fraction | double | {time} | [] | cloud_fraction
cloud_effective_particle_size | double | {time} | [um] | cloud_effective_particle_size
cloud_optical_depth | double | {time} | [] | cloud_optical_depth
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 | /All_Data/VIIRS-CLD-AGG-GEO_All/StartTime, /All_Data/VIIRS-CLD-AGG-GEO_All/MidTime
description | the time converted from seconds since 1958-01-01 to seconds since 2000-01-01T00:00:00
latitude | path | /All_Data/VIIRS-CLD-AGG-GEO_All/Latitude
longitude | path | /All_Data/VIIRS-CLD-AGG-GEO_All/Longitude
sensor_azimuth_angle | path | /All_Data/VIIRS-CLD-AGG-GEO_All/SatelliteAzimuthAngle
sensor_zenith_angle | path | /All_Data/VIIRS-CLD-AGG-GEO_All/SatelliteZenithAngle
solar_azimuth_angle | path | /All_Data/VIIRS-CLD-AGG-GEO_All/SatelliteAzimuthAngle
solar_zenith_angle | path | /All_Data/VIIRS-CLD-AGG-GEO_All/SatelliteZenithAngle
cloud_base_height | available | optional
path | /All_Data/VIIRS-CBH-EDR_All/AverageCloudBaseHeight
cloud_top_height | available | optional
path | /All_Data/VIIRS-CTH-EDR_All/AverageCloudTopHeight
cloud_top_pressure | path | /All_Data/VIIRS-CTP-EDR_All/AverageCloudTopPressure
cloud_top_temperature | available | optional
path | /All_Data/VIIRS-CTT-EDR_All/AverageCloudTopTemperature
cloud_fraction | available | optional
path | /All_Data/VIIRS-CCL-EDR_All/SummedCloudCover
cloud_effective_particle_size | available | optional
path | /All_Data/VIIRS-CEPS-EDR_All/AverageCloudEffectiveParticleSize
cloud_optical_depth | available | optional
path | /All_Data/VIIRS-COT-EDR_All/AverageCloudOpticalThickness