IASI_L2
Variables
The table below lists the variables that are present in the HARP product that results from an ingestion of IASI_L2 data.
| field name | type | dimensions | unit | description | 
|---|---|---|---|---|
| datetime | double | {time} | [seconds since 2000-01-01] | The time of the measurement at end of integration time | 
| orbit_index | int32 | absolute orbit number | ||
| longitude | double | {time} | [degree_east] | center longitude of the measurement | 
| latitude | double | {time} | [degree_north] | center latitude of the measurement | 
| longitude_bounds | double | {time, 4} | [degree_east] | corner longitudes of the measurement | 
| latitude_bounds | double | {time, 4} | [degree_north] | corner latitudes of the measurement | 
| solar_azimuth_angle | double | {time} | [degree] | solar azimuth angle at the surface | 
| solar_zenith_angle | double | {time} | [degree] | solar zenith angle at the surface | 
| sensor_azimuth_angle | double | {time} | [degree] | sensor azimuth angle at the surface | 
| sensor_zenith_angle | double | {time} | [degree] | sensor zenith angle at the surface | 
| CH4_column_density | double | {time} | [kg/m^2] | CH4 column mass density | 
| CO_column_density | double | {time} | [kg/m^2] | CO column mass density | 
| CO2_column_density | double | {time} | [kg/m^2] | CO2 column mass density | 
| O3_column_density | double | {time} | [kg/m^2] | O3 column mass density | 
| N2O_column_density | double | {time} | [kg/m^2] | N2O column mass density | 
| scan_subindex | int8 | {time} | the relative index (0-119) of this measurement within an MDR | |
| 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 | /MDR[]/MDR/RECORD_HEADER/RECORD_START_TIME | 
| description | The time for a scan is the MDR start time + the scan id (0..29) times 8 / 37. Each part of the 2x2 matrix of a scan will get assigned the same measurement time (i.e. there are 30 unique time values per mdr) | |
| orbit_index | path | /MPHR/ORBIT_START | 
| longitude | path | /MDR[]/MDR/EARTH_LOCATION[,1] | 
| latitude | path | /MDR[]/MDR/EARTH_LOCATION[,0] | 
| longitude_bounds | path | /MDR[]/MDR/EARTH_LOCATION[] | 
| description | the corner coordinates are rough estimates of the circle areas for the scan elements; the size of a scan element (in a certain direction) is taken to be half the distance, from center to center, from a scan element to its nearest neighboring scan element | |
| latitude_bounds | path | /MDR[]/MDR/EARTH_LOCATION[] | 
| description | the corner coordinates are rough estimates of the circle areas for the scan elements; the size of a scan element (in a certain direction) is taken to be half the distance, from center to center, from a scan element to its nearest neighboring scan element | |
| solar_azimuth_angle | path | /MDR[]/MDR/ANGULAR_RELATION[,2] | 
| solar_zenith_angle | path | /MDR[]/MDR/ANGULAR_RELATION[,0] | 
| sensor_azimuth_angle | path | /MDR[]/MDR/ANGULAR_RELATION[,3] | 
| sensor_zenith_angle | path | /MDR[]/MDR/ANGULAR_RELATION[,1] | 
| CH4_column_density | path | /MDR[]/MDR/INTEGRATED_CH4[] | 
| CO_column_density | path | /MDR[]/MDR/INTEGRATED_CO[] | 
| CO2_column_density | path | /MDR[]/MDR/INTEGRATED_CO2[] | 
| O3_column_density | path | /MDR[]/MDR/INTEGRATED_OZONE[] | 
| N2O_column_density | path | /MDR[]/MDR/INTEGRATED_N2O[] |