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 for inclusion within the analysis. This must take account the time taken to process L2P data (DTime L2P ), the time required to perform the analysis (DT analysis ) itself and the Maximum desirable output time delay (T output ) using (Eqn. 2.3.1) 2.4 GHRSST-PP definitions of sea surface temperature 24 GDS-032 2.4.1 to 2.4.5 are physical definitions of temperature variables See SRD section2.1.1 26 GDS-033 2.4.6. The diurnal cycle/variation of SST (DV) For the GDS, a diurnal cycle refers to changes in vertical and horizontal See SRD distribution of SST throughout a 24 hour period and thus includes warm stratified layers and cool skin effects. Cool skin section2.1.1 effects are typically more pronounced at night due to radiative cooling of the sea surface but may also occur during the day when the wind is light following a significant rainfall that may leave a cool freshwater layer on the surface of the ocean 2.4.7 GDS operational output grid specifications 26 T.2.4.7.1 GDS-034 Table 2.4.7.1 describes the GDS preliminary output grid specification that is applicable to standard L4SSTfnd global Out of scope coverage data products produced by the GDS 26 T.2.4.7.2 GDS-035 Ultra-high resolution SSTfnd data products (L4FNDUHR) will be similar to L4FND data products but produced on a smaller L4A.0050 grid specification described in Table 2.4.7.2. 27 T.2.4.7.3 GDS-036 High Resolution Diagnostic Data Set (HR-DDS) will be constructed by remapping L2P data streams onto a uniform grid as specified in Table 2.4.7.3. DDS.0090 DDS.0030 GDS-037 2.5.Missing Data Values In all GHRSST-PP data products missing values are denoted by the integer value -9999 Format GDS-038 2.6 Sea ice value In all GHRSST-PP data products sea ice is denoted by the integer value 5555. The corresponding value for the fractional sea ice coverage can be found in the associated L2P and L4 product confidence data record. 3.0 Overview of the GHRSST-PP Processing Specificationv1.0 (GDS) Format 31 GDS-039 This section of the GDS provides a general overview of the processing model introducing how data will flow within the NASR processor, the processor input and output data definitions (IODD), and the work packages (WP) that will be used to © 2004 SOC Page 118 of 193
Medspiration MED-SOC-RS-001_1 System Requirements Document Issue F Page Table, fig. Reference ID Text from reference documents SR entry implement the processor. It may be used as a “map” of the GDS and identifies the interfaces between each specific work package. The work packages themselves are expanded in technical detail within subsequent sections and associated appendices of the GDS 31 GDS-040 Figure 3.1.1 General overview of the GHRSST-PP GDS. Input data sources are shown in red, output parameters are NASR shown in green and GDS processing steps with a further breakdown are shown in light blue. Database storage is shown in dark blue. For each output parameter a corresponding metadata record is generated and delivered to the GHRSST-PP Master Metadata Repository (MMR) system. The MMR system has been omitted to preserve clarity in this figure 32 Summary description of the GDS 32 GDS-041 The GDS is designed to produce SST data products that satisfy the requirements of operational ocean forecast and NASR prediction systems. Based on a user requirements survey (see the proceedings of the 3rd GHRSST-PP workshop and the Medspiration User Requirements Document for example, both available from the GHRSST-PO or http://www.ghrsstpp.org), the main requirements are 32 GDS-042 1. SST data are required operationally in near real time and should ideally be available within 6 hours of data acquisition at SYS.0015 the satellite platform. 32 GDS-043 2. An error estimate (bias and standard deviation) and confidence data (such as an indication of atmospheric aerosol presence at the time of measurement) for each SST measurement including a bias and SD. is required by users and by L2P.0040 L2P.0050 the GHRSST-PP as a necessary precursor to data analysis. 32 GDS-044 3. A global ocean coverage analysed SST data product providing a best measure of the SSTfnd is required at a minimum NASR interval of 24 hours having a maximum spatial grid size of 1/12° (latitude x longitude). 32 GDS-045 4. Coastal modelling groups require an ultra-high spatial resolution SSTfnd and SSTskin data products on a grid cell size of 1-2km and a timeliness of ~6 hourly. SYS.0080 L4A.0020 32 Figure 3.1.1 shows a functional breakdown diagram of the GDS that identifies the flow of data, inputs and output channels SRD Fig 2.4 © 2004 SOC Page 119 of 193
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Medspiration â System Requirements Document - Data User Element