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 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 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
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[]