# GOSAT_FTS_L2_CO2_TC

## Variables

The table below lists the variables that are present in the HARP product that results from an ingestion of GOSAT_FTS_L2_CO2_TC data.

field name

type

dimensions

unit

description

datetime

double

{time}

[seconds since 2000-01-01]

time of the measurement at end of integration time

longitude

double

{time}

[degree_east]

longitude of the measurement

latitude

double

{time}

[degree_north]

latitude of the measurement

longitude_bounds

double

{time, 4}

[degree_east]

corner longitudes for the geospatial footprint of the measurement

latitude_bounds

double

{time, 4}

[degree_north]

corner latitudes for the geospatial footprint of the measurement

solar_azimuth_angle

double

{time}

[degree]

solar azimuth angle at the observation point

solar_zenith_angle

double

{time}

[degree]

solar zenith angle at the observation point

sensor_azimuth_angle

double

{time}

[degree]

sensor azimuth angle at the surface

sensor_zenith_angle

double

{time}

[degree]

sensor zenith angle at the observation point

CO2_column_number_density

double

{time}

[molec/cm^2]

CO2 column number density

CO2_column_number_density_uncertainty

double

{time}

[molec/cm^2]

uncertainty of the CO2 column number density

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

/scanAttribute/time[]

longitude

path

/Data/geolocation/longitude[]

latitude

path

/Data/geolocation/latitude[]

longitude_bounds

path

/Data/geolocation/footPrintLongitude

description

the corners are calculated by defining a bounding box around the circular footprint area

latitude_bounds

path

/Data/geolocation/footPrintLatitude

description

the corners are calculated by defining a bounding box around the circular footprint area

solar_azimuth_angle

path

/Data/geolocation/solarAzimuth[]

solar_zenith_angle

path

/Data/geolocation/solarZenith[]

sensor_azimuth_angle

path

/Data/geolocation/satelliteAzimuth[]

sensor_zenith_angle

path

/Data/geolocation/satelliteZenith[]

CO2_column_number_density

path

/Data/totalColumn/CO2TotalColumn

CO2_column_number_density_uncertainty

path

/Data/totalColumn/CO2TotalColumnSmoothingError, /Data/totalColumn/CO2TotalColumnRetrievalNoise, /Data/totalColumn/CO2TotalColumnInterferenceError, /Data/totalColumn/CO2TotalColumnExternalNoise

description

the uncertainty returned is the sum of all four error components