Medspiration â System Requirements Document - Data User Element

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Medspiration MED-SOC-RS-001_1 System Requirements Document Issue F Page Table, fig. Reference ID Text from reference documents SR entry 48 WP2-064 Assign an Atmospheric Optical Depth (AOD) value MRG.0060 48 WP2-065 The specific thresholds, limits and processing rules that are used to QC each data set are stored in a system wide L2P QLC.0020 configuration file. This allows easy modification of critical values and other configurable parameters without the need for software code changes. 48 WP2-066 As auxiliary data files are only used as indicators within the GDS, only simple QC tests are specified. NASR 48 WP2-067 It is left to the RDAC and GDAC to determine the level of QC that is required to use these data with confidence. NASR 48 WP2-068 Different pre-processing operations must be applied to IR and MW SST data and to each auxiliary data file. NASR 49 Figure WP2-069 Fig.5.2.1 Functional breakdown diagram of pre-processing and merging operations common to IR and MW SST data files. NASR 5.2.1 A L2P configuration file is used to store appropriate thresholds and reference values. 49 WP-ID2.1.1 SST Climatology limit check 49 WP2-070 This test is used to set the L2P confidence data record variable DT_min defined in Table A1.2.2 in Appendix A1. It identifies data that fall outside of acceptable range of global SST values and identifies unrealistic SST values. QLC.0070 QLC.0080 49 The GDS specifies the following rules: 49 Rule WP2-071 Rule 2.1.1a: A valid SST observation must lie within a temperature range of LowSSTLimit < SST < HighSSTLimit. If the QLC.0070 2.1.1a pixel SST value is out of these limits, the observation must be rejected from the final L2P data file. QLC.0040 49 Rule WP2-072 Rule 2.1.1b: The difference between the pixel SST value (SSTobs) and the reference SST fied, SSTref (defined in QLC.0080 2.1.1b Appendix A3, Table A3.1.1), DT_min is derived using: DT_min = SSTobs - SSTref (Eq. 2.1.1) The DT_min value should be inserted into the DT_min field of the L2P confidence data record for the pixel in question. 49 WP2-074 This reference SST is SST1m derived as a 10 day “coldest” climatology from Pathfinder SST data products. SST values QLC.0080 for a given location and season that are significantly beneath this climatological value indicate the presence of cloud contamination. 50 WP-ID2.1.2 Compute SST measurement time © 2004 SOC Page 138 of 193
Medspiration MED-SOC-RS-001_1 System Requirements Document Issue F Page Table, fig. Reference ID Text from reference documents 50 WP2-075 Most SST data files provide the time at which a SST measurement was acquired but some do not. The GHRSST-PP GDS SR entry ING.0070 specifies that the time of measurement should be extracted or computed to the nearest minute and then coded as continuous UTC time coordinates using the following rules: 50 Rule WP2-076 Rule 2.1. 2a The time of the earliest SST measurement within this data set should be coded as a continuous time ING.0080 2.1.2a coordinate specified as minutes from 00:00:00 UTC January 1, 1981 (start of the useful AVHRR SST data record) and entered into the netCDF data file global variable Start_Time. 50 Rule WP2-077 Rule 2.1.1.2b The time of SST measurement should be coded as the deviation in minutes from the netCDF data file global ING.0090 2.1.1.2b variable Start_Time and entered into the L2P confidence record variable TimeDeviation. 50 WP-ID2.1.3 Assign fractional sea ice value if required 50 WP2-078 Some SST data are contaminated in part or wholly by sea ice. This procedure is used to set the L2P confidence data record variable FractionalSeaIce defined in Table A1.2.2 in Appendix A1. MRG.0070 MRG.0080 MRG.0090 50 WP2-079 Some input SST data streams provide a flag to indicate that the SST measurement is contaminated by sea ice (e.g., MRG.0090 AMSR-E). In cases where no such data are present in the input data stream a reference sea ice data product (defined in Appendix A3) should be used to assess the likelihood of sea ice contamination. The GDS specifies the following rules: 50 Rule WP2-080 Rule 2.1.3a If an input data set pixel fractional sea ice estimate exists, this should be used to set the FractionalSeaIce MRG.0070 2.1.3a flag of the L2P confidence data record. 50 Rule WP2-081 Rule 2.1.3b If an input data set pixel sea ice flag exists (i.e. indicating sea ice but not ther fractional amount of coverage), MRG.0080 2.1.3b this should be used to set the FractionalSeaIce flag of the L2P confidence data record to 100% according to the code values defined in Table A1.4.2 in Appendix A1. If the flag is a binary flag. a check should be made against the reference fractional sea Ice data set to determine if the pixel is likely to be 100% contaminated and the fraction reported by the reference data set should be set if it is < 100%. © 2004 SOC Page 139 of 193
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Medspiration â System Requirements Document - Data User Element

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Medspiration â System Requirements Document - Data User Element