IAS_02_NAC
Variables
The table below lists the variables that are present in the HARP product that results from an ingestion of IAS_02_NAC data.
field name |
type |
dimensions |
unit |
description |
|---|---|---|---|---|
orbit_index |
int32 |
absolute orbit number |
||
datetime |
double |
{time} |
[s since 2020-01-01] |
on-board time in UTC |
longitude |
double |
{time} |
[degree_east] |
geocentric longitude at sounder pixel centre |
longitude_bounds |
double |
{time, 4} |
[degree_east] |
corner longitudes of the measurement |
latitude |
double |
{time} |
[degree_north] |
geodetic latitude at sounder pixel centre |
latitude_bounds |
double |
{time, 4} |
[degree_north] |
corner latitudes of the measurement |
solar_azimuth_angle |
double |
{time} |
[degree] |
solar azimuth angle at sounder pixel centre |
solar_zenith_angle |
double |
{time} |
[degree] |
solar zenith angle at sounder pixel centre |
sensor_azimuth_angle |
double |
{time} |
[degree] |
measurement azimuth angle at sounder pixel centre |
sensor_zenith_angle |
double |
{time} |
[degree] |
measurement zenith angle at sounder pixel centre |
surface_altitude |
float |
{time} |
[m] |
altitude of surface |
validity |
int8 |
{time} |
[] |
general retrieval quality flag |
HNO3_column_density |
float |
{time} |
[kg/m2] |
integrated HNO3 |
HNO3_column_density_validity |
int32 |
{time} |
[] |
retrieval flags |
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 |
|
|---|---|---|
orbit_index |
path |
/@orbit_start |
datetime |
path |
/data/geolocation_information/onboard_utc[] |
longitude |
path |
/data/geolocation_information/sounder_pixel_longitude[] |
longitude_bounds |
path |
/data/geolocation_information/sounder_pixel_longitude_bounds[] |
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 (within the same 2x2 subgrid inside a Field of Regard (FOR)) |
|
latitude |
path |
/data/geolocation_information/sounder_pixel_latitude[] |
latitude_bounds |
path |
/data/geolocation_information/sounder_pixel_latitude_bounds[] |
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 (within the same 2x2 subgrid inside a Field of Regard (FOR)) |
|
solar_azimuth_angle |
path |
/data/geolocation_information/sounder_pixel_sun_azimuth[] |
solar_zenith_angle |
path |
/data/geolocation_information/sounder_pixel_sun_zenith[] |
sensor_azimuth_angle |
path |
/data/geolocation_information/sounder_pixel_azimuth[] |
sensor_zenith_angle |
path |
/data/geolocation_information/sounder_pixel_zenith[] |
surface_altitude |
path |
/data/surface_z[] |
validity |
path |
/data/hno3_qflag[] |
description |
the uint8 data is cast to int8 |
|
HNO3_column_density |
path |
/data/atmosphere_mass_content_of_nitric_acid[] |
HNO3_column_density_validity |
path |
/data/hno3_bdiv[] |
description |
the uint32 data is cast to int32 |
|