POLDER/PARASOL daily aerosol product over land - 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:
LS2 Version 10.11: Released September 2015LS2-HDF5 Version 1.00: First release March 2016
LS2-HDF5 Version 1.01: Released September 2016
File description: POLDER3_L2B-LGA
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_Directional_Fields | |||||||||
| phi | uint16 | [?, ?, ?] |
degrees | NONE | 0.1 | 0.0 | 65535 | NONE | relative azimuth angle of the pixel center |
| sequence_number | uint8 | [?, ?, ?] |
no unit | NONE | 1.0 | 0.0 | 255 | NONE | sequence number in the orbit [1-130] |
| surface_polarized_reflectance_865 | uint16 | [?, ?, ?] |
no unit | NONE | 0.0001 | -1.0 | 65535 | NONE | surface polarized reflectance 865 nm |
| surface_reflectance_1020 | uint16 | [?, ?, ?] |
no unit | NONE | 0.001 | 0.0 | 65535 | NONE | surface reflectance 1020 nm |
| surface_reflectance_490 | uint16 | [?, ?, ?] |
no unit | NONE | 0.001 | 0.0 | 65535 | NONE | surface reflectance 490 nm |
| surface_reflectance_565 | uint16 | [?, ?, ?] |
no unit | NONE | 0.001 | 0.0 | 65535 | NONE | surface reflectance 565 nm |
| surface_reflectance_670 | uint16 | [?, ?, ?] |
no unit | NONE | 0.001 | 0.0 | 65535 | NONE | surface reflectance 670 nm |
| surface_reflectance_765 | uint16 | [?, ?, ?] |
no unit | NONE | 0.001 | 0.0 | 65535 | NONE | surface reflectance 765 nm |
| surface_reflectance_865 | uint16 | [?, ?, ?] |
no unit | NONE | 0.001 | 0.0 | 65535 | NONE | surface reflectance 865 nm |
| thetav | uint16 | [?, ?, ?] |
degrees | NONE | 0.1 | 0.0 | 65535 | NONE | view zenith angle of the pixel center |
| End of group : Data_Directional_Fields | |||||||||
| Beginning of group : Data_Fields | |||||||||
| Nviews | uint8 | [?, ?] |
no unit | NONE | 1.0 | 0.0 | 255 | NONE | number of available view directions [1-16] |
| phis | uint8 | [?, ?] |
degrees | NONE | 1.42 | 0.0 | 255 | NONE | solar azimuth angle of the pixel center |
| thetas | uint16 | [?, ?] |
degrees | NONE | 0.1 | 0.0 | 65535 | NONE | solar zenith angle of the pixel center |
| 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 [1-6480] |
| 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 [1-3240] |
| 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 | no (670 nm, 865 nm) couple |
| Quality_Flags_02 | uint8 | [?, ?] |
no units | NONE | 1.0 | 0.0 | 255 | NONE | no (763 nm, 765 nm) couple |
| Quality_Flags_03 | uint8 | [?, ?] |
no units | NONE | 1.0 | 0.0 | 255 | NONE | no (865 nm, 910 nm) couple |
| Quality_Flags_04 | uint8 | [?, ?] |
no units | NONE | 1.0 | 0.0 | 255 | NONE | at least one no significant data (nsd) |
| Quality_Flags_05 | uint8 | [?, ?] |
no units | NONE | 1.0 | 0.0 | 255 | NONE | insufficient number of valid viewing directions |
| Quality_Flags_06 | uint8 | [?, ?] |
no units | NONE | 1.0 | 0.0 | 255 | NONE | Central pixel of the 3x3 super-pixel is unavailable |
| Quality_Flags_07 | uint8 | [?, ?] |
no units | NONE | 1.0 | 0.0 | 255 | NONE | Dense vegetation detected: Pixel re-classified as clear |
| Quality_Flags_08 | uint8 | [?, ?] |
no units | NONE | 1.0 | 0.0 | 255 | NONE | Snow cover detected: Pixel re-classified as clear |
| Quality_Flags_09 | uint8 | [?, ?] |
no units | NONE | 1.0 | 0.0 | 255 | NONE | 3:no Ozone correction; 1:Ozone absorption correction using TOMS data; 2:Ozone absorption correction using ECMWF data |
| Quality_Flags_10 | uint8 | [?, ?] |
no units | NONE | 1.0 | 0.0 | 255 | NONE | Stratospheric aerosol correction uncertain (optical thickness larger than a threshold) |
| Quality_Flags_11 | uint8 | [?, ?] |
no units | NONE | 1.0 | 0.0 | 255 | NONE | Imprecise stratospheric aerosol correction (optical thickness larger than a threshold) |
| Quality_Flags_12 | uint8 | [?, ?] |
no units | NONE | 1.0 | 0.0 | 255 | NONE | No information on surface snow cover (some cloud tests cannot be applied) |
| Quality_Flags_13 | uint8 | [?, ?] |
no units | NONE | 1.0 | 0.0 | 255 | NONE | Presence of snow cover |
| Quality_Flags_14 | uint8 | [?, ?] |
no units | NONE | 1.0 | 0.0 | 255 | NONE | No polarization-based cloud detection test (observation geometry unsuited) |
| Quality_Flags_15 | uint8 | [?, ?] |
no units | NONE | 1.0 | 0.0 | 255 | NONE | Blue channel test indicates Cloud or aerosol presence in the pixel |
| Quality_Flags_16 | uint8 | [?, ?] |
no units | NONE | 1.0 | 0.0 | 255 | NONE | Cloud Detection Indicators (0: because cloudy pixels are not included in the product) |
| Quality_Flags_17 | uint8 | [?, ?] |
no units | NONE | 1.0 | 0.0 | 255 | NONE | number of clear pixels in the associated super-pixel |
| Quality_Flags_18 | uint8 | [?, ?] |
no units | NONE | 1.0 | 0.0 | 255 | NONE | insufficient nb of valid viewing dir for at least one wavelength or nb of clear pixels or nb (865 nm, 910 nm) couple |
| Quality_Flags_19 | uint8 | [?, ?] |
no units | NONE | 1.0 | 0.0 | 255 | NONE | hot spot distance |
| Quality_Flags_20 | uint8 | [?, ?] |
no units | NONE | 1.0 | 0.0 | 255 | NONE | Quality index for aerosol inversion dedicated to atmospheric corrections. 0 (bad) – 100 (Very good) |
| Quality_Flags_21 | uint8 | [?, ?] |
no units | NONE | 1.0 | 0.0 | 255 | NONE | No inversion because min scattering angle larger than a threshold or max scattering angle smaller than a threshold |
| Quality_Flags_22 | uint8 | [?, ?] |
no units | NONE | 1.0 | 0.0 | 255 | NONE | AOT larger than a threshold. No surface reflectance estimate. |
| Quality_Flags_23 | uint8 | [?, ?] |
no units | NONE | 1.0 | 0.0 | 255 | NONE | Pixel not recognized as Dark Dense Vegetation. Comparison between modeled and measured 443 nm Refl. was not attempted. |
| Quality_Flags_24 | uint8 | [?, ?] |
no units | NONE | 1.0 | 0.0 | 255 | NONE | Large difference between measured and modeled reflectance at 443 nm. |
| Quality_Flags_25 | uint8 | [?, ?] |
no units | NONE | 1.0 | 0.0 | 255 | NONE | Lack of input data for aerosol correction |
| Quality_Flags_26 | uint8 | [?, ?] |
no units | NONE | 1.0 | 0.0 | 255 | NONE | Index of BRDF used for atmospheric correction (surface atmosphere coupling) |
| Quality_Flags_27 | uint8 | [?, ?] |
no units | NONE | 1.0 | 0.0 | 255 | NONE | Quantifies the difference between the a-priori and the observed BRDF |
| Quality_Flags_28 | uint8 | [?, ?] |
no units | NONE | 1.0 | 0.0 | 255 | NONE | The 490 nm signal is weak by comparison to the tropospheric aerosol signal |
| Quality_Flags_29 | uint8 | [?, ?] |
no units | NONE | 1.0 | 0.0 | 255 | NONE | The 670 nm signal is weak by comparison to the tropospheric aerosol signal |
| Quality_Flags_30 | uint8 | [?, ?] |
no units | NONE | 1.0 | 0.0 | 255 | NONE | The 865 nm signal is weak by comparison to the tropospheric aerosol signal |
| Quality_Flags_31 | uint8 | [?, ?] |
no units | NONE | 1.0 | 0.0 | 255 | NONE | Intensity of the tropospheric aerosol signal (ranges from 0 - high - to 15 - weak) |
| End of group : Quality_Flags_Fields | |||||||||
Product global attributes
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