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
index	int32	{time}		zero-based index of the sample within the source product
datetime	double	{time}	seconds since 2000-01-01	The time of the measurement at end of integration time (in seconds since 2000-01-01 00:00:00)
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
surface_solar_azimuth_angle	double	{time}	degree	solar azimuth angle at the surface
surface_solar_zenith_angle	double	{time}	degree	solar zenith angle at the surface
surface_viewing_azimuth_angle	double	{time}	degree	viewing azimuth angle at the surface
surface_viewing_zenith_angle	double	{time}	degree	viewing zenith angle at the surface
CH4_column_mass_density	double	{time}	kg/m^2	CH4 column mass density
CO_column_mass_density	double	{time}	kg/m^2	CO column mass density
CO2_column_mass_density	double	{time}	kg/m^2	CO2 column mass density
O3_column_mass_density	double	{time}	kg/m^2	O3 column mass density
N2O_column_mass_density	double	{time}	kg/m^2	N2O column mass density
scan_subset_counter	int8	{time}		the relative index (0-119) of this measurement within an MDR

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)
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 neigbouring 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 neigbouring scan element
surface_solar_azimuth_angle	path	/MDR[]/MDR/ANGULAR_RELATION[,2]
surface_solar_zenith_angle	path	/MDR[]/MDR/ANGULAR_RELATION[,0]
surface_viewing_azimuth_angle	path	/MDR[]/MDR/ANGULAR_RELATION[,3]
surface_viewing_zenith_angle	path	/MDR[]/MDR/ANGULAR_RELATION[,1]
CH4_column_mass_density	path	/MDR[]/MDR/INTEGRATED_CH4[]
CO_column_mass_density	path	/MDR[]/MDR/INTEGRATED_CO[]
CO2_column_mass_density	path	/MDR[]/MDR/INTEGRATED_CO2[]
O3_column_mass_density	path	/MDR[]/MDR/INTEGRATED_OZONE[]
N2O_column_mass_density	path	/MDR[]/MDR/INTEGRATED_N2O[]