GOSAT_FTS_L2_CH4_TC

Variables

The table below lists the variables that are present in the HARP product that results from an ingestion of GOSAT_FTS_L2_CH4_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

CH4_column_number_density

double

{time}

[molec/cm^2]

CH4 column number density

CH4_column_number_density_uncertainty

double

{time}

[molec/cm^2]

uncertainty of the CH4 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[]

CH4_column_number_density

path

/Data/totalColumn/CH4TotalColumn

CH4_column_number_density_uncertainty

path

/Data/totalColumn/CH4TotalColumnSmoothingError, /Data/totalColumn/CH4TotalColumnRetrievalNoise, /Data/totalColumn/CH4TotalColumnInterferenceError, /Data/totalColumn/CH4TotalColumnExternalNoise

description

the uncertainty returned is the sum of all four error components