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 |
|---|---|---|---|---|
| index | int32 | {time} | zero-based index of the sample within the source product | |
| datetime | double | {time} | seconds since 2000-01-01 | time of the measurement at end of integration time (in seconds since 2000-01-01 00:00:00) |
| 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 |
| viewing_azimuth_angle | double | {time} | degree | viewing azimuth angle at the surface |
| viewing_zenith_angle | double | {time} | degree | viewing zenith angle at the observation point |
| CO2_column_number_density | double | {time} | molec/cm^2 | CO2 column number density |
| CO2_column_number_density_stdev | double | {time} | molec/cm^2 | uncertainty of the CO2 column number density |
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[] |
| viewing_azimuth_angle | path | /Data/geolocation/satelliteAzimuth[] |
| description | the viewing angle is the opposite of the satellite angle; the returned angle is thus angle + 180 (mapped to [0,360]) | |
| viewing_zenith_angle | path | /Data/geolocation/satelliteZenith[] |
| description | the viewing angle is the opposite of the satellite angle; the returned angle is thus 180 - angle | |
| CO2_column_number_density | path | /Data/totalColumn/CO2TotalColumn |
| CO2_column_number_density_stdev | 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 | |