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 | |