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} | [] | cloud top height |
| cloud_top_height_uncertainty | double | {time} | [] | 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 | vcd0, vcd1 | the fitting window choice for ozone to ingest; either ‘vcd0’ (window 0, the default) or ‘vcd1’ (window 1) |
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=vcd0 (default) |
| path | /ddr[]/irr/vcd[0]/total | |
| condition | ozone=vcd1 | |
| path | /ddr[]/irr/vcd[1]/total | |
| O3_column_number_density_uncertainty | condition | ozone=vcd0 (default) |
| 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) | |