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 WP-ID3.1.1 Derivation of MDB data record 70 WP3-038 The data inputs to GHRSST-PP MDB records are L2P data streams and in situ observations. MDB.0020 70 WP3-039 For an MDB data record to be accurate and legitimate the comparison must be between like measurements although in the MDB.0270 case of SSTskin observations, in situ data are extremely scarce 70 WP3-040 Instead, emphasis is placed on the use of in situ SST1m data derived from drifting/moored buoy and ship observations. MDB.0270 71 WP3-041 in situ data drawn down directly from the GTS must be QC’d locally before use MDB.0130 71 WP3-042 Other data streams are only available to national institutes where they must be pre-processed and matched to satellite MDB.0120 data on a case by case basis. 71 WP3-043 each RDAC and GDAC centre must be responsible for implementing basic in situ QC procedures using local MDB.0130 ocean/atmosphere knowledge and experience 71 WP3-044 limits of coincidence must be applied to constrain the contributions to the error budget of the SSES/validation procedure MDB.0230 from these sources to acceptable levels (say
Medspiration MED-SOC-RS-001_1 System Requirements Document Issue F Page Table, fig. Reference ID Text from reference documents SR entry MDB_space_constraint. 71 WP3-049 [1] Based on discussions at the 4th GHRSST-PP Science Team Workshop, Los Angeles, USA, September 2003, MDB.0240 MDB_time_constraint = 25 km radius of the pixel centre point and MDB_space_constraint should be within ±6 ours of the satellite overpass. These constraints are considered the absolute maximum and all efforts should be made to reduce these to the smallest deviations from zero as possible. 71 WP3-050 In situ data that cannot be matched to better than these criteria should be ignored MDB.0240 71 WP3-051 RDAC and GDAC should aim to use data with the highest spatial and temporal coincidence MDB.0210 71 Rule WP3-052 Because of the day-night asymmetry in the growth and decay of the diurnal thermocline, more stringent conditions for MDB.0240 3.1.2a acceptable time intervals may be required during the day than at night 71 Rule WP3-053 For these and ambiguous cases, such as close to the terminator, the smallest spatial separation and shortest possible time MDB.0240 3.1.2a interval should be sought. 72 Rule WP3-054 Only one instance of each in situ observation for each individual satellite sensor should occur within the MDB i.e. the MDB.0250 3.1.2b satellite data having the smallest deviation in space and time from the in situ observation should be used within the MDB MDB.0210 and all other duplicates should be removed 72 Rule WP3-055 L2P data adjacent to the validation measurement must be extracted to provide information on the spatial variability in the MDB.0320 3.1.2c vicinity of the validation point 72 Rule WP3-056 Appropriate ‘missing data’ values will be used if any of the elements of the pixel array extend beyond the edges of the MDB.0320 3.1.2c instrument swath. 72 Rule WP3-057 A 5 x 5 array of L2P data should be extracted centred on the validation pixel. MDB.0320 3.1.2c 72 Rule WP3-058 All L2P confidence data each pixel stored in a MDB record must accompany the extracted data MDB.0310 3.1.2d © 2004 SOC Page 163 of 193
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Medspiration â System Requirements Document - Data User Element