GOME_L2

Variables

The table below lists the variables that are present in the HARP product that results from an ingestion of GOME_L2 data.

field name type dimensions unit description
datetime_stop double {time} [seconds since 2000-01-01] time of the measurement at end of integration time
datetime_length double {time} [s] measurement integration time
orbit_index int32     absolute orbit number
latitude double {time} [degree_north] tangent latitude of the measurement
longitude double {time} [degree_east] tangent longitude of the measurement
latitude_bounds double {time, 4} [degree_north] corner latitudes for the ground pixel of the measurement
longitude_bounds double {time, 4} [degree_east] corner longitudes for the ground pixel of the measurement
O3_column_number_density double {time} [molec/cm^2] ozone total column
O3_column_number_density_uncertainty double {time} [molec/cm^2] error on the ozone total column
NO2_column_number_density double {time} [molec/cm^2] NO2 total column
NO2_column_number_density_uncertainty double {time} [molec/cm^2] error on the NO2 total column
cloud_fraction double {time} [] cloud fraction
cloud_fraction_uncertainty double {time} [] cloud fraction error
cloud_top_height double {time} [km] cloud top height
cloud_top_height_uncertainty double {time} [km] cloud top height uncertainty
cloud_top_pressure double {time} [hPa] cloud top pressure
cloud_top_pressure_uncertainty double {time} [hPa] cloud top pressure uncertainty
cloud_top_albedo double {time} [] cloud top albedo
cloud_top_albedo_uncertainty double {time} [] cloud top albedo uncertainty
surface_pressure double {time} [hPa] surface pressure
surface_height double {time} [km] surface height
surface_albedo double {time} [] surface albedo
solar_zenith_angle double {time} [degree] solar zenith angle at top of atmosphere
viewing_zenith_angle double {time} [degree] line of sight zenith angle at top of atmosphere
relative_azimuth_angle double {time} [degree] relative azimuth angle at top of atmosphere
scan_subindex int8 {time}   relative index (0-3) of this measurement within a scan (forward + backward)
scan_direction_type int8 {time}   scan direction for each measurement; enumeration values: forward (0), backward (1)
index int32 {time}   zero-based index of the sample within the source product

Ingestion options

The table below lists the available ingestion options for GOME_L2 products.

option name legal values description
ozone vcd1 the fitting window choice for ozone to ingest; either window 0 (default) or window 1 (ozone=vcd1)

Mapping description

The table below details where and how each variable was retrieved from the input product.

field name mapping description
datetime_stop path /ddr[]/glr/datetime
datetime_length description set to a fixed value of 1.5s for all pixels
orbit_index path /pir/start_orbit
latitude path /ddr[]/glr/corners[4]/lat
longitude path /ddr[]/glr/corners[4]/lon
description each longitude will be transformed from a value in the range 0 - 360 to a value in the range -180 - 180
latitude_bounds path /ddr[]/glr/corners[0:3]/lat
description the corners are rearranged in the following way: 1,3,2,0
longitude_bounds path /ddr[]/glr/corners[0:3]/lon
description the corners are rearranged in the following way: 1,3,2,0
O3_column_number_density condition ozone unset
path /ddr[]/irr/vcd[0]/total
condition ozone=vcd1
path /ddr[]/irr/vcd[1]/total
O3_column_number_density_uncertainty condition ozone unset
path /ddr[]/irr/vcd[0]/total, /ddr[]/irr/vcd[0]/error
description relative error is converted to absolute error by multiplying with measured value
condition ozone=vcd1
path /ddr[]/irr/vcd[1]/total, /ddr[]/irr/vcd[1]/error
description relative error is converted to absolute error by multiplying with measured value
NO2_column_number_density path /ddr[]/irr/vcd[2]/total
NO2_column_number_density_uncertainty path /ddr[]/irr/vcd[2]/total, /ddr[]/irr/vcd[2]/error
description relative error is converted to absolute error by multiplying with measured value
cloud_fraction condition version=1
path /ddr[]/irr/icfa/frac
condition version>1
path /ddr[]/irr/ocra/cloud_frac
cloud_fraction_uncertainty condition version=1
path /ddr[]/irr/icfa/frac, /ddr[]/irr/icfa/err_frac
description relative error is converted to absolute error by multiplying with measured value
condition version>1
path /ddr[]/irr/ocra/cloud_frac, /ddr[]/irr/ocra/cloud_frac_error
description relative error is converted to absolute error by multiplying with measured value
cloud_top_height available optional
condition version>1
path /ddr[]/irr/rocinn/height
cloud_top_height_uncertainty available optional
condition version>1
path /ddr[]/irr/rocinn/height, /ddr[]/irr/rocinn/height_error
description relative error is converted to absolute error by multiplying with measured value
cloud_top_pressure condition version=1
path /ddr[]/irr/icfa/press
condition version>1
path /ddr[]/irr/rocinn/pressure
cloud_top_pressure_uncertainty condition version=1
path /ddr[]/irr/icfa/press, /ddr[]/irr/icfa/err_press
description relative error is converted to absolute error by multiplying with measured value
condition version>1
path /ddr[]/irr/rocinn/pressure, /ddr[]/irr/rocinn/pressure_error
description relative error is converted to absolute error by multiplying with measured value
cloud_top_albedo available optional
condition version>1
path /ddr[]/irr/rocinn/albedo
cloud_top_albedo_uncertainty available optional
condition version>1
path /ddr[]/irr/rocinn/albedo, /ddr[]/irr/rocinn/albedo_error
description relative error is converted to absolute error by multiplying with measured value
surface_pressure condition version=1
path /ddr[]/irr/icfa/surf_press
condition version>1
path /ddr[]/irr/surface_pressure
surface_height available optional
condition version>1
path /ddr[]/irr/surface_height
surface_albedo available optional
condition version>1
path /ddr[]/irr/surface_albedo
solar_zenith_angle path /ddr[]/glr/sza_toa[1]
viewing_zenith_angle path /ddr[]/glr/line_sight_toa[1]
relative_azimuth_angle path /ddr[]/glr/rel_azi_toa[1]
scan_subindex path /ddr[]/glr/subset_counter
description relative index (0-3) of this measurement within a scan (forward + backward)
scan_direction_type path /ddr[]/glr/subset_counter
description the scan direction is based on the subset_counter of the measurement; 0-2: forward (0), 3: backward (1)