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 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[]