Product definition document:
PDD_SAPHIR-L2-RH_V1_R5.pdf (updated in January 2017)Version history:
Version 1.00: Released July 2015. Original versionVersion 2.00: Released November 2015. Modification of format, minor correction in algorithm over land.
Version 3.00: Released March 2017. Compared to the RH estimation scheme used in Version 2.00 which relied on Normal distributions, Version 3.00 product relies on a Beta distribution as its compact support and allowance for asymmetries about the mean are more favorable for describing the relative humidity. The estimation of parameters also provides a characterization of the retrieval uncertainty of RH for every observing pixel of SAPHIR
Version 3.01: Released July 2018. In this new version, the quality flags have been re-defined in order to take into account situations where the RH values result from an extrapolation of the retrieval model, and thus can be reasonably questioned. The valid range is considered to be 25% below/above the training range of the model. Those extrapolated data are now considered as missing, and a new quality flag is introduced
File description: MT1_L2-RH-SAPSL1A2-1.07_2017-03-01T12-24-41_V3-00.hdf
Data_Fields/Quality_Index dataset attributes
| Dataset attribute | DataType | Dimensions | Value |
| long_name | string | 1 | Quality_Index |
| units | string | 1 | None |
| format | string | 1 | 32-bit integer |
| HDF_Calibration_Equation | string | 1 | physical_value = scale_factor*(SDS_count - add_offset) |
| Missing_Output | int32 | 1 | -999 |
| QA_SDS | string | 1 | None |
| actual_range | int32 | 2 | [0, 9586992] |
| Num_Fill | int32 | 1 | 0 |
| Num_Missing_Output | int32 | 1 | 0 |
| Num_Valid | int32 | 1 | 539500 |
| Comments | string | 1 | The Quality_Index is a 32 bits word where each bit as a significant value: 0) Coastal Profile (no guarantee in restitution); 1: Rainy pixel; 2-5): Rainy pixel details; 6) Empty; 7-24): 6 groupsof 3 bits (one for each layer) related to 1: Very high relative humidity (over 97%); 2: Extrapolation outside the learning range; 3: Cloudy Layer; 25-31): L1 Quality Flags (Currently 0). |
| _FillValue | int32 | 1 | 2147483647 |
| scale_factor | float64 | 1 | 1.0 |
| scale_factor_err | float64 | 1 | 0.0 |
| add_offset | float64 | 1 | 0.0 |
| add_offset_err | float64 | 1 | 0.0 |
| calibrated_nt | int32 | 1 | 24 |
