Medspiration â System Requirements Document - Data User Element

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Medspiration MED-SOC-RS-001_1 System Requirements Document Issue F SR.MRG.0240/I The source of data used to set the L2P confidence data variable should be provided. Code values are defined in [RD-3] Table 2.1.6. SR.MRG.0250/I The difference in time expressed in hours between the time of SST measurement and the time of AOD observations/analysis should be provided. SR.MRG.0260/I If no AOD measurement is available, an AOD value derived from NWP nearest in space and time to the SST measurement should be used. Comment: There is no AOD estimates in NWP outputs for the time being. When NAAPS are available, it is suggested they are given priority over the AVHRR-AOD. 3.2.5 Confidence value derivation SR.CFD.0010/I A “confidence value”, having a value spanning 0 (no data, measurement is sea ice) to 5 (highest confidence in the SST measurement), is derived for each pixel. Comment: In GDS, figure 2.2.1.4.1 is not consistent with table 2.2.1.4. A confidence value should identify a cloudy case. That would enlarge the range of confidence values from 0 to 6. SR.CFD.0020/I The confidence value is to be used when assigning appropriate bias and rms error estimate to each measurement. SR.CFD.0030/I Confidence data are extracted from native SST data streams if present and they are derived using auxiliary and reference data streams and sensor specific error statistics. Comment: We may adopt native bias and sdtdev, but not confidence value. There is a risk of inconsistency. It is suggested to admit also native confidence values (flagged as such, by a L2_native_confidence_value flag). SR.CFD.0050/I There shall be separate schemes to derive Proximity_Confidence values for infrared and microwave SST data streams. © 2004 SOC Page 36 of 193
Medspiration System Requirements Document 3.2.5.1 Microwave sensor case MED-SOC-RS-001_1 Issue F MW SST (Input) contaminati on map sidelobe contaminated y raise flag raise flag y rain contaminated TSanal TSanal-SST > threshold n TMISST 12ms-1 y raise flag LANDMSK calculate distance to rain (Drain), ice (Dice) and land (Dland) Use wsp , TMI flag and min(Drain,Dice,Dland) to determine MPCV MW SST (output) Figure 3-2 Schematic of procedure to set the microwave proximity confidence value (MPCV). As Figure 3-2 shows, several different pieces of information are needed to perform the tests leading to evaluate the MPCV which is to be added to the data quality information in the L2P products derived from microwave sensors. This is the basis for the following system requirements. © 2004 SOC Page 37 of 193
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Medspiration â System Requirements Document - Data User Element