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 sensor specific error estimates for each pixel value have been included and the original SST data reformatted to netCDF format. SR entry L2P.0050 L2P.0060 46 WP2-042 No modification to the original SST data values has taken place during the conversion process. L2P.0080 47 Footnote 7 WP2-043 Note that in the case of 1km input SST data streams, averaging of these data is permitted to provide data at a resolution of no greater than 1/12° latitude x longitude. In this case, there may be some modification to the original input data. L2P.0090 47 WP2-044 L2P data products will be available to the operational user community in real time and ideally, within 6 hours following PER.SYS.0010 reception at the satellite platform. 47 WP2-045 However, as the GHRSST-PP intends to generate global 1/12° L4 analysed SST data output from L2P data files, high L2P.0090 resolution input data sets may be averaged to a coarser resolution no greater than 1/12°. 47 Figure WP2-046 Functional breakdown of WP-ID2 identifying each major sub task NASR 5.1 47 WP2-047 A functional breakdown diagram for WP-ID2 is shown in Figure 5.1 (additional functional breakdown diagrams are NASR provided for WP-ID2.1, WP-ID2.2 and WP-ID2.5 in the appropriate section below). 47 WP2-048 In a series of pre-processing and quality control procedures, microwave and Infrared Satellite SST data are merged L2P.0030 together with reference data and auxiliary data including satellite and NWP Wind speed, sea ice concentration, surface solar irradiance and aerosol optical depth estimates. 47 WP2-049 If data processing problems are encountered the SST data file is rejected from the GDS, (e.g., values are outside of expected range, overwhelming cloud contamination) an error message is sent to the satellite SST data provider point of ING.0100 QLC.0035 contact (as defined in the GHRSST-PP MMR_DSD record associated with the SST data file) explaining why the SST data have not been used in the GDS. A copy of the message is also sent to the GHRSST-PP error log system (errlog@ghrsstpp.org). 48 WP2-050 If the SST data are accepted into the GDS, L2P additional pixel confidence data are then derived for every SST L2P.0040 © 2004 SOC Page 136 of 193
Medspiration MED-SOC-RS-001_1 System Requirements Document Issue F Page Table, fig. Reference ID Text from reference documents SR entry measurement. L2P confidence data are required to: 48 WP2-051 1. Derive a quantitative ‘confidence value’ for each SST measurement that is used to identify reduced quality data. NASR 48 WP2-052 2. Derive and interpret of SSES values assigned to each SST measurement. NASR 48 WP2-053 3. Force parameterisations that estimate diurnal variability. NASR 48 WP2-054 Using confidence data, Sensor Specific Error Statistics (SSES) are assigned to each SST measurement based on analysis L2P.0050 of the GHRSST-PP Match-up Database (MDB) system described in WP-ID3. 48 WP2-055 A L2P data file is generated (format described in Appendix A1.4) which contains the original SST data together with pixel L2P.0060 confidence data. L2P data files are formatted as GDS netCDF files (WP-ID1.2.3) that are fully described in Appendix A1. 48 WP2-056 For each L2P data file a MMR_FR metadata record (described in Appendix A6) is generated and registered at the MMR ING.0030 under the appropriate MMR_DSD. 48 WP2-057 L2P data files and pixel confidence data are identical in format for all input SST data streams with differs between the IR L2P.0060 and MW SST data exist. Using a single data format for all SST data files greatly facilitates SST inter-comparison and merging activities within the GHRSST-PP. 48 WP-ID2.1 Pre-processing and merging of auxiliary data. 48 WP2-058 This work-package describes in detail common pre-processing operations performed on each IR and MW SST data file. MRG.0020 Figure 5.2.1 provides a functional breakdown diagram that identifies each common pre-processing pixel based operation. These are: 48 WP2-059 Check that the SST value lies within acceptable limits, if not then reject the data file QLC.0070 48 WP2-060 Compute the pixel measurement time ING.0070 48 WP2-061 Assign a fractional sea ice value if required MRG.0030 48 WP2-062 Assign a wind speed value MRG.0040 48 WP2-063 Assign a surface solar irradiance (SSI) value MRG.0050 © 2004 SOC Page 137 of 193
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Medspiration â System Requirements Document - Data User Element