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 58 WP2-170 Note that the actual values for IPCVThres1-3 and IPCV_D1 and IPCV_D2 are expected to vary for each sensor (Brisson SR entry CFD.0370 et al., 2001) and the exact value of these parameters is a subject of on-going research and development within the GHRSST-PP. IPCVThres1-3, IPCV_D1 and IPCV_D2 values will be maintained by the GHRSST-PP International Project Office and stored in the L2P configuration file that is specific to each RDAC or GDAC. 58 WP2-171 The derivation of these values will initially use best estimates until a sufficiently large population of data within the CFD-0320 GHRSST-PP MDB is available (e.g., those suggested by Brisson et al. (2001). 58 WP2-172 The filename of this configuration file should be written into each L2P file using the optional global netCDF attribute “References” as described in Appendix A1.2.1. Format requirement 58 WP2-173 It is expected that the methodology used to derive IPCV may be modified in the GDSv2. EXP.L2P.0030 59 WP-ID2.2.1.5 Assign Sensor Specific Error Statistic 59 WP2-174 This processing step is used to assign the L2P confidence data record variable bias and sd defined in Table A1.2.2 in Appendix A1. L2P.6010 L2P.6020 59 The GDS specifies the following rules: 59 Rule WP2-175 Rule 2.2.1.5a: If pixel bias error and sd error statistics are provided by a data provider, these values may be assigned to L2P.6010 2.2.1.5a the L2P bias and sd variables respectively. In this case, the L2_native_bias and L2_native_sd flags of the corresponding L2P confidence data record should also be set as these error estimates are independent of GHRSST-PP methods. 59 WP2-176 If native bias and sd error values are not available or an RDAC chooses to ignore the error statistics provided by a data provider, these must be assigned based on the L2P Proximity_Confidence variable using sensor specific error statistics L2P.6020 CFD.0020 (SSES) as described in WP-ID3. In this case the L2_native_bias and L2_native_sd. flags of the corresponding L2P confidence data record should be set to zero. 59 The GDS specifies the following rule: © 2004 SOC Page 150 of 193
Medspiration MED-SOC-RS-001_1 System Requirements Document Issue F Page Table, fig. Reference ID Text from reference documents SR entry 59 Rule WP2-177 Rule 2.2.1.5b: If pixel bias error and sd error statistics are not available for SST measurements, these values should be L2P.6020 2.2.1.5b assigned the most recent SSES bias and sd values for the each data stream and L2P confidence data record Proximity_Confidence value. In addition, the L2_native_bias and L2_native_sd. flags of the corresponding L2P confidence data record should be set to zero. 59 WP2-178 It is expected that the IPCV and SSES schemes will develop considerably throughout the GHRSST-PP. EXP.L2P.0030 59 WP-ID2.2.2 Quality control of satellite MW SST data sets and assignment of pixel confidence data. 59 WP2-179 SSES and L2P confidence and data must be derived for every MW SST measurement contained within an input SST data stream. see lines following 59 WP2-180 The processing is different from infrared data streams since the native MW fields already contain wind speed, rain, and CFD.0050 other ancillary parameters required to calculate the coded bitfields identifying suspect pixels. 59 WP2-181 Specific thresholds, limits, reference files, and processing rules that are used to process each data set are stored in a CFD.0220 system wide L2P microwave L2P configuration file. 59 WP2-1820 This allows easy modification of critical values and other configurable parameters without the need for software code CFD.0220 changes. 59 WP2-183 Figure 2.2.2.1 shows a functional breakdown diagram of the processing steps required to derive confidence data and NASR assign SSES to microwave SST measurements. 59 WP2-184 The output of these processing steps is a GHRSST-PP L2P netCDF data file described in Appendix A1.4. format 59 WP2-185 Table A1.4.2 in Appendix A1 describes the format of GDS L2P pixel confidence data records. format 59 WP2-186 The following sections describe in detail the MW QC tests and pre-processing operations performed on each data file. NASR 59 WP-ID2.2.2.1 SST Climatology limit check 59 WP2-187 This test is identical to 2.1.1 described above. QLC.0070 QLC.0080 © 2004 SOC Page 151 of 193
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Medspiration â System Requirements Document - Data User Element