POLDER/PARASOL daily aerosol product over ocean - Level-2
The geophysical parameters shown in table given below are computed from the level-1 product for each superpixel (3x3 pixels), by orbit segment. These Level-2 parameters are non-directional.Version history:
OC2 Version 11.11: Released September 2015OC2-HDF5 Version 1.00: First release March 2016
OC2-HDF5 Version 1.01: Released September 2016
File description: POLDER3_L2B-OGC
Product file format: HDF5
Product datasets
| Dataset | DataType | Dimensions | units | valid_range | scale_factor | add_offset | _FillValue | Missing_Output | long_name |
| Beginning of group : Data_Fields | |||||||||
| AI | uint16 | [?, ?] |
no unit | NONE | 0.002 | 0.0 | 65535 | NONE | aerosol index: AOT_865_total x Angstrom_exponent |
| AOT_670_fine | uint16 | [?, ?] |
no unit | NONE | 0.002 | 0.0 | 65535 | NONE | fine mode aerosol optical thickness at 670 nm |
| AOT_670_total | uint16 | [?, ?] |
no unit | NONE | 0.002 | 0.0 | 65535 | NONE | total aerosol optical thickness at 670 nm |
| AOT_865_fine | uint16 | [?, ?] |
no unit | NONE | 0.002 | 0.0 | 65535 | NONE | fine mode aerosol optical thickness at 865 nm |
| AOT_865_non_spherical_coarse | uint16 | [?, ?] |
no unit | NONE | 0.002 | 0.0 | 65535 | NONE | aerosol optical thickness of non spherical coarse mode at 865 nm |
| AOT_865_spherical_coarse | uint16 | [?, ?] |
no unit | NONE | 0.002 | 0.0 | 65535 | NONE | aerosol optical thickness of spherical coarse mode at 865 nm |
| AOT_865_total | uint16 | [?, ?] |
no unit | NONE | 0.002 | 0.0 | 65535 | NONE | total aerosol optical thickness at 865 nm |
| AOT_865_total_uncertainty | uint8 | [?, ?] |
no unit | NONE | 0.0005 | 0.0 | 255 | NONE | uncertainty of aerosol optical thickness at 865 nm |
| Angstrom_exponent | uint16 | [?, ?] |
no unit | NONE | 0.01 | -0.5 | 65535 | NONE | aerosol Angstrom exponent between 670 and 865 nm |
| Angstrom_exponent_fine | uint16 | [?, ?] |
no unit | NONE | 0.01 | -0.5 | 65535 | NONE | fine mode aerosol Angstrom exponent |
| effective_radius | uint8 | [?, ?] |
microns | NONE | 0.05 | 0.0 | 255 | NONE | aerosol effective radius |
| effective_radius_coarse | uint8 | [?, ?] |
microns | NONE | 0.05 | 0.0 | 255 | NONE | coarse mode aerosol effective radius |
| effective_radius_fine | uint8 | [?, ?] |
microns | NONE | 0.005 | 0.0 | 255 | NONE | fine mode aerosol effective radius |
| log_beta_1020 | uint16 | [?, ?] |
no unit | NONE | 0.005 | 0.0 | 65535 | NONE | logarithm of the backscattering coefficient at 1020nm |
| log_beta_565 | uint16 | [?, ?] |
no unit | NONE | 0.005 | 0.0 | 65535 | NONE | logarithm of the backscattering coefficient at 565nm |
| non_sphericity_index | uint8 | [?, ?] |
no unit | NONE | 0.005 | 0.0 | 255 | NONE | relative contribution of non spherical particles to coarse mode |
| quality_index | uint8 | [?, ?] |
no unit | NONE | 0.01 | 0.0 | 255 | NONE | quality index for aerosol retrieval |
| refractive_index_coarse | uint8 | [?, ?] |
no unit | NONE | 0.01 | 1.0 | 255 | NONE | coarse mode aerosol refractive index (only for AOT_865_spherical_coarse > 0.02) |
| refractive_index_fine | uint8 | [?, ?] |
no unit | NONE | 0.01 | 1.0 | 255 | NONE | fine mode aerosol refractive index (only for AOT_865_fine > 0.02) |
| scattering_asymmetry_factor | uint8 | [?, ?] |
no unit | NONE | 0.005 | 0.0 | 255 | NONE | aerosol scattering asymmetry factor |
| thetas | uint16 | [?, ?] |
degrees | NONE | 0.1 | 0.0 | 65535 | NONE | 3x3 superpixel mean solar zenith angle |
| End of group : Data_Fields | |||||||||
| Beginning of group : Geolocation_Fields | |||||||||
| Latitude | float64 | [?, ?] |
degrees | NONE | 1.0 | 0.0 | -99999.0 | NONE | pixel center latitude |
| Longitude | float64 | [?, ?] |
degrees | NONE | 1.0 | 0.0 | -99999.0 | NONE | pixel center longitude |
| column_number | uint16 | [?, ?] |
no units | NONE | 1.0 | 0.0 | 65535 | NONE | column number of the pixel in the POLDER grid [1-2160] |
| land_sea_flag | uint8 | [?, ?] |
percent | NONE | 1.0 | 0.0 | 255 | NONE | land sea flag (0:sea, 100:land, 50:mixed) |
| row_number | uint16 | [?, ?] |
no units | NONE | 1.0 | 0.0 | 65535 | NONE | row number of the pixel in the POLDER grid [1-1080] |
| surface_altitude | int16 | [?, ?] |
meters | NONE | 1.0 | 0.0 | 32767 | NONE | pixel center surface altitude |
| End of group : Geolocation_Fields | |||||||||
| Beginning of group : Quality_Flags_Fields | |||||||||
| Quality_Flags_01 | uint8 | [?, ?] |
no units | NONE | 1.0 | 0.0 | 255 | NONE | Error on oxygen absorption correction (R763>R765) |
| Quality_Flags_02 | uint8 | [?, ?] |
no units | NONE | 1.0 | 0.0 | 255 | NONE | Error on water vapor absorption correction (R910>R865) |
| Quality_Flags_03 | uint8 | [?, ?] |
no units | NONE | 1.0 | 0.0 | 255 | NONE | Error on Oxygen transmission (R763>R765) after water-vapor correction |
| Quality_Flags_04 | uint8 | [?, ?] |
no units | NONE | 1.0 | 0.0 | 255 | NONE | Some of the retrieved parameters are out of range. Pixel should not be used for further processing |
| Quality_Flags_05 | uint8 | [?, ?] |
no units | NONE | 1.0 | 0.0 | 255 | NONE | Very small aerosol optical thickness. Set to zero |
| Quality_Flags_06 | uint8 | [?, ?] |
no units | NONE | 1.0 | 0.0 | 255 | NONE | Small aerosol optical thickness. No aerosol model retrieval |
| Quality_Flags_07 | uint8 | [?, ?] |
no units | NONE | 1.0 | 0.0 | 255 | NONE | Significant aerosol optical thickness. Full retrieval |
| Quality_Flags_08 | uint8 | [?, ?] |
no units | NONE | 1.0 | 0.0 | 255 | NONE | Case 1: small range of scattering angles, with rather low values |
| Quality_Flags_09 | uint8 | [?, ?] |
no units | NONE | 1.0 | 0.0 | 255 | NONE | Case 2: small range of scattering angles, with rather large values |
| Quality_Flags_10 | uint8 | [?, ?] |
no units | NONE | 1.0 | 0.0 | 255 | NONE | Case 3: large range of scattering angles, with rather low values |
| Quality_Flags_11 | uint8 | [?, ?] |
no units | NONE | 1.0 | 0.0 | 255 | NONE | Case 4: large range of scattering angles, with rather large values |
| Quality_Flags_12 | uint8 | [?, ?] |
no units | NONE | 1.0 | 0.0 | 255 | NONE | Scattering angles unsuited for phase function retrieval |
| Quality_Flags_13 | uint8 | [?, ?] |
no units | NONE | 1.0 | 0.0 | 255 | NONE | Only one or two directions available for aerosol retrieval |
| Quality_Flags_14 | uint8 | [?, ?] |
no units | NONE | 1.0 | 0.0 | 255 | NONE | Error on stratospheric aerosol correction (corrected reflectance lower than 0) |
| Quality_Flags_15 | uint8 | [?, ?] |
no units | NONE | 1.0 | 0.0 | 255 | NONE | Stratospheric aerosol correction uncertain (optical thickness larger than a threshold) |
| Quality_Flags_16 | uint8 | [?, ?] |
no units | NONE | 1.0 | 0.0 | 255 | NONE | Surface pressure correction larger than a threshold |
| Quality_Flags_21 | uint8 | [?, ?] |
no units | NONE | 1.0 | 0.0 | 255 | NONE | Ozone data source (0:TOMS; 1: ECMWF) |
| Quality_Flags_22 | uint8 | [?, ?] |
no units | NONE | 1.0 | 0.0 | 255 | NONE | Variable source of ozone data in the 3x3 superpixel |
| Quality_Flags_23 | uint8 | [?, ?] |
no units | NONE | 1.0 | 0.0 | 255 | NONE | Surface wind speed range (0: u 15 m s-1) |
| Quality_Flags_24 | uint8 | [?, ?] |
no units | NONE | 1.0 | 0.0 | 255 | NONE | Inhomogeneous wind speed within the 3x3 superpixel. |
| End of group : Quality_Flags_Fields | |||||||||
Product global attributes
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