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Shipboard Environmental (Data) Acquisition System (SEAS)
Comparisons of Release 2.5 input data with deck 874 Shipboard Environmental Acquisition System (SEAS) test dataFigures 1-3 and Examples 1-3 provide 2000-07 duplicate elimination (dupelim) results comparing Release 2.5 (R2.5) input data with a new test file (seas874_test_imma.dat) of deck 874 ship data covering 1991-2010 (435,546 reports). These results reflect "transient" duplicate (dup) matches (as explained below) between deck 874, and real-time (GTS) and delayed-mode ship receipts from these other decks:
- 792 US Natl. Cntrs. for Environ. Pred. (NCEP) BUFR GTS: Ship Data
- 926 International Maritime Meteorological (IMM) Data
- 927 International Marine (US- or foreign-keyed ship data)
During dupelim processing, all reports are compared with all other reports within a circular buffer, such that a duplicate status (DUPS; ref. Appendix A) flag within each report may be reset (to a higher, but not lower, value) as a result of subsequent matches. "Transient" matches therefore refers to all matches that were made, and DUPS results that may be altered later during this processing. Furthermore, dup matches used for these results are limited to those considered to be of "certain" dup status (i.e. DUPS 8-13).
The most significant SEAS problems identified are that the translated data appear to erroneously contain hour and minutes instead of hour to hundredths, and Examples 1 indicates some possibly erroneous positive web bulb temperatures (i.e. in conjunction with negative dew point temperatures; these examples also reveal an possible GTS coding error in NCEP dew point temperatures of 99.0 spanning at least 2002-06). Also there were sea surface temperature indicator differences, wind directions off by 10 in Examples 2-3 and a slight wind speed bias. Some differences may be the result of quality control in the other decks, for example of clouds and in deck 792 calm and variable wind directions. There are more deck 874 wind speed indicators than wind speeds in Figure 1.
Dups involving call sign KRGB were quite dissimilar (see Examples 3 final no pattern example). Figures 1-2 include KRGB dups and may be unduly biased by that call sign, which also represented the most frequent of the overall SEAS data (2.32%). Figure 3 excludes KRGB dups.
ID (identification/call sign) KRGB included
Figure 1. For each primary data element (ref. IMMA documentation), stacked bars show agreement (blue) vs. disagreement (red) among transient duplicates (where missing vs. extant data counts as disagreement); and symbols indicate the total extant level of deck 792 (+) and deck 874 (x) data (thus any displacement between the symbol and the top of the bar represents missing data in one data source; note the total height of the bar extends only to the level at which the element is extant in one and/or the other source).
Introductory explanation of the Examples format: In the bullets preceding each group of IMMA report examples, we have highlighted noteworthy (and what appear to be systematic) patterns of field differences. The bulleted sentences are generally concluded with percentages (nn%), indicating the percentage of disagreement accounted for by a given data pattern, with respect to the total amount of element disagreement (i.e. red bar), as shown in the corresponding figure (here Figure 1). Read "/" as "or" for when multiple patterns or variants (and associated percentages) were identified. In the actual IMMA report examples that follow the bullets, the primary field abbreviations are listed vertically (ref. IMMA documentation), and the caret (^) appears below character positions that differ between two example reports. Report examples are not included below for IX or SD2 because they are outside the selected primary fields, and sometimes not specifically for "no pattern" report examples, although they may appear in other examples. Some patterns have been combined in a single example.
Examples 1. Transient matches between decks 792 vs. 874 (NCEP vs. SEAS).
- DS (ship course) noteworthy differences: deck 792 DS = 1 and deck 874 DS = missing together with
- VS (ship speed) noteworthy differences: deck 792 VS = 1 and deck 874 VS = missing (15%).
A W D A A L L T N S P B WP D S T TB B D Y M D H A O ITTLDV I I I CD W V V WW L PI AT BT P S S NCH CC W W W S S S T TS 1 B C R O Y R T N MCIISS D I D 1I DI WI V W1 PA PT TI TI T I TNHLIHMH D P H D P H I LI 0 1 K 20071023 0 5760 22680 0 011 1WTEB 03624 26 98 22101762 15 790 63 40 887 62A 165 128 792 20071023 0 5760 22680 0 00 1WTEB 03624 26 98 22101762 150 790 63 46 887 62A 165 128 874 ^ ^^ ^ ^ ^^^ - II (ID indicator) noteworthy differences: deck 792 II = 2 - generic ID and deck 874 II = 1 - call sign (95%).
- ID (identification) noteworthy differences: deck 792 ID = MASKSTID/KGJD/MAUMEE and deck 874 ID = any pattern/NRUO/WDA4649 (43%)/(31%)/(11%).
Note: All NCEP ship reports (deck 792) are being uniformly remasked by NCEP to "MASKSTID" since December 2007 owing to ship commercial and security concerns.A W D A A L L T N S P B WP D S T TB B D Y M D H A O ITTLDV I I I CD W V V WW L PI AT BT P S S NCH CC W W W S S S T TS 1 B C R O Y R T N MCIISS D I D 1I DI WI V W1 PA PT TI TI T I TNHLIHMH D P H D P H I LI 0 1 K 200712251000 4350 27230 0 042 2MASKSTID 02304 62 95 22101964 -65 886 4AA 1 165 169 792 200712251000 4350 27230 0 0042 1WZE4928 02304 62 95 22101964 0 -65 886 4AA 165 169 874 ^ ^^^^^^^^^ ^ ^ ^^^ 2001 423 0 2530 20580 0 013 1KGJD 0 804 77 98 21102308 10 244 130 1 227522 472 3 310 4 4 165 234 792 2001 423 0 2530 20580 0 0013 1NRUO 0 804 77 98 21102308 103 244 130 1 227522 472 3 310 4 4 165 234 874 ^ ^^^^ ^ ^^^ 2006 5312000 4550 27690 0 033 1MAUMEE 02704 62 97 10186 111 1 788 A 0 1 165 169 792 2006 5312000 4550 27690 0 0033 1WDA4649 02704 62 97 10186 0 111 1 788 A AAA 0 1 165 169 874 ^ ^^^^^^^ ^ ^ ^^ ^^^ - D (wind direction) noteworthy differences: deck 792 D = 362 - variable/361 - calm and deck 874 D = 361 - calm/362 - variable (35%)/(13%).
A W D A A L L T N S P B WP D S T TB B D Y M D H A O ITTLDV I I I CD W V V WW L PI AT BT P S S NCH CC W W W S S S T TS 1 B C R O Y R T N MCIISS D I D 1I DI WI V W1 PA PT TI TI T I TNHLIHMH D P H D P H I LI 0 1 K 200111 41500 4140 29000 0 022 1KNBD 03624 77 97 20101938 3 1190 98 80 1 1161 0 905 2 1 165 170 792 200111 41500 4140 29000 0 0022 1KNBD 03614 77 97 20101938 30 1190 98 80 3 116100 905 2 1 165 170 874 ^ ^ ^ ^ ^ ^^^ 200710241800 1450 25510 0 052 1WTEJ 03614 0 97 22101230 2 2720 240 230 1 282552 669 0 031 8 2 165 275 792 200710241800 1450 25510 0 0052 1WTEJ 03624 0 97 22101230 20 2720 240 227 1 282552 669 0 031 8 2 165 275 874 ^ ^ ^ ^^ ^^^ - W (wind speed) noteworthy differences: deck 874 W = deck 792 W - 0.1 (92%).
A W D A A L L T N S P B WP D S T TB B D Y M D H A O ITTLDV I I I CD W V V WW L PI AT BT P S S NCH CC W W W S S S T TS 1 B C R O Y R T N MCIISS D I D 1I DI WI V W1 PA PT TI TI T I TNHLIHMH D P H D P H I LI 0 1 K 2000 6181200 5410 20010 0 063 1LAOT4 01504129 97616100007 50 700 60 50 1 80877 42A 8 715 8 8 165 126 792 2000 6181200 5410 20010 0 0063 1LAOT4 01504128 97616100007 503 700 60 50 3 80877 42A 8 715 8 8 165 126 874 ^ ^ ^ ^ ^^^ - WW (present weather) noteworthy differences: alternate being missing.
- W1 (past weather) noteworthy differences: alternate being missing.
- A (barometric tendency) noteworthy differences: alternate being missing.
- PPP (barometric tendency) noteworthy differences: alternate being missing.
- W2 (second past weather) noteworthy differences: alternate being missing.
A W D A A L L T N S P B WP D S T TB B D Y M D H A O ITTLDV I I I CD W V V WW L PI AT BT P S S NCH CC W W W S S S T TS 1 B C R O Y R T N MCIISS D I D 1I DI WI V W1 PA PT TI TI T I TNHLIHMH D P H D P H I LI 0 1 K 2005 121 600 5100 21390 0 024 1KRGB 0 804185 95586 97157 35 710 78 80 1 509 A AAA 165 127 792 2005 121 600 5100 21390 0 0024 1KRGB 0 804185 9715 0 71 A AAA 165 127 874 ^ ^^^^^ ^ ^^^ ^ ^^ ^^ ^ ^^^ ^^^ 2006 5 9 900 4760 27150 0 023 1WDC6055 01804 41 98 10061 100 1 17 A 1 165 169 792 2006 5 9 900 4760 27150 0 0023 1WDC6055 01804 41 9821510061 0 100 1 17 A AAA 165 169 874 ^ ^^^ ^ ^ ^^ ^ ^^^ 2002 6 51300 5750 22520 0 011 1WCY2920 01804 26 98 10135 78 886 4AA 1 165 128 792 2002 6 51300 5750 22520 0 00 1WCY2920 01804 26 98 101354 0 78 886 4AA 165 128 874 ^ ^^ ^ ^ ^ ^^^ - WBT (wet-bulb temperature) noteworthy differences: deck 874 WBT not negative (25%) [note deck 792 DPT = 99.0].
A W D A A L L T N S P B WP D S T TB B D Y M D H A O ITTLDV I I I CD W V V WW L PI AT BT P S S NCH CC W W W S S S T TS 1 B C R O Y R T N MCIISS D I D 1I DI WI V W1 PA PT TI TI T I TNHLIHMH D P H D P H I LI 0 1 K 2002 5121700 5290 20450 0 075 1WRYW 02704 26 98 22102304 0 670 -33 990 1 56742 46A 2 132 6 3 165 126 792 2002 5121700 5290 20450 0 0075 1WRYW 02704 26 98 22102304 00 670 33 -15 1 56742 46A 2 132 6 3 165 126 874 ^ ^ ^ ^^^ ^^^ 2003 410 900 4950 35550 0 024 1WGXO 0 503 67 98 16101164 0 780 -33 990 1 97221 470 3 3 6 5 5 165 177 792 2003 410 900 4950 35550 0 0024 1WGXO 0 503 67 98 16101164 00 780 33 -34 1 97221 470 3 3 6 5 5 165 177 874 ^ ^ ^ ^^^ ^^^ 2004 121 0 3910 15500 0 014 1KDBG 03304139 97 1101191 15 560 -30 990 665 5AA 4 5 8 9 165 193 792 2004 121 0 3910 15500 0 0014 1KDBG 03304139 97 1101191 150 560 30 -5 665 5AA 4 5 8 9 165 193 874 ^ ^ ^ ^^^ ^^^ 2005 4 61200 4730 20660 0 025 1WFLH 02403 77 98 22100507 20 560 -28 990 1 61888 6AA 3 230 8 9 165 162 792 2005 4 61200 4730 20660 0 0025 1WFLH 02403 77 98 22100507 200 560 28 -11 1 61888 6AA 3 230 8 9 165 162 874 ^ ^ ^ ^^^ ^^^ 2006 2 8 300 3970 28770 0 053 1WMVF 03503103 95 0101502 20 511 -28 990 1 874 A AAA 6 226 5 3 165 206 792 2006 2 8 300 3970 28770 0 0053 1WMVF 03503103 0101502 200 511 28 -3 3 8740A AAA 6 226 5 3 165 206 874 ^ ^^ ^ ^ ^^^ ^ ^ ^^^ 2006 2282200 4990 22460 0 034 1KGTX 02404 26 98 32 99502 10 610 -28 990 1 62652 47A 29 8 7 165 164 792 2006 2282200 4990 22460 0 0034 1KGTX 02404 26 98 32 99502 100 610 28 -20 1 62652 47A 29 8 7 165 164 874 ^ ^ ^ ^^ ^^^ 2002 119 600 5520 22100 0 073 1KGTX 02703154 97 22101407 11 390 -22 -230 1 51886 47A 3 527 5 7 165 128 792 2002 119 600 5520 22100 0 0073 1KGTX 02703154 97 22101407 110 390 22 -1 1 51886 47A 3 527 5 7 165 128 874 ^ ^ ^ ^^^^ ^^^ 2005 223 0 4240 30870 0 064 1WGLA 0 803 98 98 22101607 38 110 -6 -40 1 83553 63A 4 429 4 5 165 172 792 2005 223 0 4240 30870 0 0064 1WGLA 0 803 98 98 22101607 380 110 6 -1 1 83553 63A 4 429 4 5 165 172 874 ^ ^ ^ ^^^ ^^^ - DPT (dew-point temperature) noteworthy differences: deck 792 DPT in whole degrees (71%).
A W D A A L L T N S P B WP D S T TB B D Y M D H A O ITTLDV I I I CD W V V WW L PI AT BT P S S NCH CC W W W S S S T TS 1 B C R O Y R T N MCIISS D I D 1I DI WI V W1 PA PT TI TI T I TNHLIHMH D P H D P H I LI 0 1 K 2002 6131800 5820 22540 0 024 1WCY2920 03004 93 99 20102757 3 1390 106 80 4 A 9A6 165 128 792 2002 6131800 5820 22540 0 0024 1WCY2920 03004 92 99 20102757 30 1390 106 77 40A 9A6 165 128 874 ^ ^ ^ ^^ ^ ^^^ 2002 6152300 2590 28460 0 035 1WJBJ 02103 87 97 6101402 20 2670 250 240 1 278756 43A 165 242 792 2002 6152300 2590 28460 0 0035 1WJBJ 02103 87 97 6101402 200 2670 250 244 1 278756 43A 165 242 874 ^ ^ ^ ^^^ - SI (SST method indicator) noteworthy differences: deck 792 SI = 1 - condenser inlet and deck 874 SI = 3 - hull contact sensor (97%).
A W D A A L L T N S P B WP D S T TB B D Y M D H A O ITTLDV I I I CD W V V WW L PI AT BT P S S NCH CC W W W S S S T TS 1 B C R O Y R T N MCIISS D I D 1I DI WI V W1 PA PT TI TI T I TNHLIHMH D P H D P H I LI 0 1 K 20041023 900 3370 24180 0 021 1ELZT3 03604 62 10163 150 1 187 A 165 202 792 20041023 900 3370 24180 0 0011 1ELZT3 03604 62 10163 0 150 3 187 A AAA 165 202 874 ^ ^ ^ ^ ^ ^^ ^^^ - N (total cloud amount) noteworthy differences: deck 792 N = missing/8 oktas and deck 874 N = 9 - sky obscured/missing (34%)/(20%).
A W D A A L L T N S P B WP D S T TB B D Y M D H A O ITTLDV I I I CD W V V WW L PI AT BT P S S NCH CC W W W S S S T TS 1 B C R O Y R T N MCIISS D I D 1I DI WI V W1 PA PT TI TI T I TNHLIHMH D P H D P H I LI 0 1 K 2001 6281500 4720 27350 0 000 1WYP8657 0 204 46 9145410225 70 2 1 165 169 792 2001 6281500 4720 27350 0 0000 1WYP8657 0 204 46 9145410225 0 70 9 A AAA 2 1 165 169 874 ^ ^ ^ ^ ^^^ ^^^ 2005 1 81800 2060 12160 0 065 1KRGB 0 304144 98636101754 0 2040 211 210 1 230887 AAA 165 226 792 2005 1 81800 2060 12160 0 0065 1KRGB 0 304144 10175 0 204 A AAA 165 226 874 ^ ^^^^^ ^ ^^ ^ ^^^ ^^^ ^ ^^^^^^ ^^^ - NH (lower cloud amount) noteworthy differences: deck 792 NH = missing when no lower clouds (84%).
- H (cloud height) noteworthy differences: deck 792 H = missing and deck 874 H = A - not known/9 - no clouds (42%)/(15%).
A W D A A L L T N S P B WP D S T TB B D Y M D H A O ITTLDV I I I CD W V V WW L PI AT BT P S S NCH CC W W W S S S T TS 1 B C R O Y R T N MCIISS D I D 1I DI WI V W1 PA PT TI TI T I TNHLIHMH D P H D P H I LI 0 1 K 2002 3121200 6110 20910 0 0 1WMH8 03303 36 99 9990 28 0 0 00 165 90 792 2002 3121200 6110 20910 0 00 1WMH8 03303 36 99 9990 0 28 000 900 165 90 874 ^ ^ ^ ^ ^^^ 2001 8 31800 4130 14950 0 053 1C6QD3 01604 77 97 22101557 20 1750 165 160 8 A AA 165 156 792 2001 8 31800 4130 14950 0 0053 1C6QD3 01604 77 97 22101557 203 1750 165 160 88A AAA 165 156 874 ^ ^ ^ ^ ^^^ 2002 7 72300 5490 19470 0 082 1WBO3345 01803 21 92454101702 20 90 9 A AAA 0 030 5 4 165 125 792 2002 7 72300 5490 19470 0 0082 1WBO3345 01803 21 92454101702 200 90 99A AAA 0 030 5 4 165 125 874 ^ ^ ^ ^^^ - CL (low cloud type) noteworthy differences: deck 792 CL = missing and deck 874 CL = A - not visible (98%).
- CM (middle cloud type) noteworthy differences: deck 792 CM = missing and deck 874 CM = A - not visible (99%).
- CH (high cloud type) noteworthy differences: deck 792 CH = missing and deck 874 CH = A - not visible (99%).
A W D A A L L T N S P B WP D S T TB B D Y M D H A O ITTLDV I I I CD W V V WW L PI AT BT P S S NCH CC W W W S S S T TS 1 B C R O Y R T N MCIISS D I D 1I DI WI V W1 PA PT TI TI T I TNHLIHMH D P H D P H I LI 0 1 K 20071114 300 4570 27540 0 000 1WE3592 02303154 98 2100176 1 110 A 2 2 165 169 792 20071114 300 4570 27540 0 0000 1WE3592 02303154 98 2100176 0 1 110 A AAA 2 2 165 169 874 ^ ^ ^ ^^ ^^^ - WH (wave height) noteworthy differences: deck 792 WH not= missing (97%).
A W D A A L L T N S P B WP D S T TB B D Y M D H A O ITTLDV I I I CD W V V WW L PI AT BT P S S NCH CC W W W S S S T TS 1 B C R O Y R T N MCIISS D I D 1I DI WI V W1 PA PT TI TI T I TNHLIHMH D P H D P H I LI 0 1 K 2005 427 900 4730 27060 0 053 1WE4879 03003 51 98712 9991 10 1 308 A 1 165 169 792 2005 427 900 4730 27060 0 0053 1WE4879 03003 51 98712 9991 0 10 1 308 A AAA 165 169 874 ^ ^ ^ ^^ ^ ^^^ - SD (swell direction) noteworthy differences: deck 792 SD = missing and deck 874 SD = 38 - indeterminate (32%).
- SD2 (2nd swell direction) noteworthy differences: deck 792 SD2 = missing and deck 874 SD2 = 38 - indeterminate (63%).
A W D A A L L T N S P B WP D S T TB B D Y M D H A O ITTLDV I I I CD W V V WW L PI AT BT P S S NCH CC W W W S S S T TS 1 B C R O Y R T N MCIISS D I D 1I DI WI V W1 PA PT TI TI T I TNHLIHMH D P H D P H I LI 0 1 K 2000 8 41200 4920 16160 0 055 1OZFC2 0 204 41 97 22101521 19 1200 112 100 1 104886 3AA 3 1 4 2 165 158 792 2000 8 41200 4920 16160 0 0055 1OZFC2 0 204 41 97 22101521 193 1200 112 100 1 104886 3AA 3 138 4 2 165 158 874 ^ ^ ^^ ^^^ - IX (station/weather indicator) noteworthy differences: alternate being IX = 1 - manned included and IX = 3 - manned omitted (100%).
- SLP (sea level pressure) noteworthy differences: no pattern.
- AT (air temperature) noteworthy differences: no pattern.
- SST (sea surface temperature) noteworthy differences: no pattern.
Figure 2. As for Figure 1 except deck 926 (+) and deck 874 (x).
Examples 2. Transient matches between decks 926 vs. 874 (IMM vs. SEAS).
- LAT (latitude) noteworthy differences: deck 874 LAT = deck 926 LAT +/- 0.1 (24%/56%).
- LON (longitude) noteworthy differences: deck 874 LON = deck 926 LON +/- 0.1 (55%/14%).
A W D A A L L T N S P B WP D S T TB B D Y M D H A O ITTLDV I I I CD W V V WW L PI AT BT P S S NCH CC W W W S S S T TS 1 B C R O Y R T N MCIISS D I D 1I DI WI V W1 PA PT TI TI T I TNHLIHMH D P H D P H I LI 0 1 K 20011128 600 3660 23670 0 22 1WTEJ US0 304 21097 31102355 10 1140 940 70 3 13577204 0 3 235 6 2 165 201 926 20011128 600 3650 23680 0 0022 1WTEJ 0 304 21 97 31102355 13 1140 94 70 3 135772 4AA 3 235 6 2 165 201 874 ^ ^ ^^ ^^ ^ ^ ^ ^ ^^ ^^^ - DS (ship course) noteworthy differences: deck 926 DS = 9 - unknown and deck 874 DS = missing (22%).
- VS (ship speed) noteworthy differences: no pattern.
A W D A A L L T N S P B WP D S T TB B D Y M D H A O ITTLDV I I I CD W V V WW L PI AT BT P S S NCH CC W W W S S S T TS 1 B C R O Y R T N MCIISS D I D 1I DI WI V W1 PA PT TI TI T I TNHLIHMH D P H D P H I LI 0 1 K 200011231200-1620 17460 0 9 1NRUO US0 404 77098 20100607 50 3000 2721 264 1 2771110400 2 119 3 1 165 375 926 200011231200-1620 17460 0 00 1NRUO 0 404 77 98 20100607 53 3000 272 260 1 277111 400 2 119 3 1 165 375 874 ^^^ ^^ ^ ^ ^ ^ ^ ^^^ - ID (identification) noteworthy differences: deck 926 ID = WSD707/KGJD and deck 874 ID = WSD7079/NRUO (34%)/(25%).
- W (wind speed) noteworthy differences: deck 874 W = deck 926 W - 0.1 (48%).
- DPT (dew-point temperature) noteworthy differences: deck 874/926 DPT in whole degrees (72%)/(13%).
A W D A A L L T N S P B WP D S T TB B D Y M D H A O ITTLDV I I I CD W V V WW L PI AT BT P S S NCH CC W W W S S S T TS 1 B C R O Y R T N MCIISS D I D 1I DI WI V W1 PA PT TI TI T I TNHLIHMH D P H D P H I LI 0 1 K 20001117 600 2150 20140 0 41 1WSD707 US0 504129098 21102032 210 2440 2171 206 1 2612210500 4 3 7 8 4 165 234 926 20001117 600 2150 20140 0 0041 1WSD7079 0 504128 98 21102032 213 2440 217 210 1 261221 500 4 3 7 8 4 165 234 874 ^^ ^ ^^ ^^ ^ ^ ^^ ^ ^^^ 200012142100-4810 14660 0 9 1KGJD US03204139097 32100707 400 1150 1051 97 1 1116510490 3 227 6 4 165 480 926 200012142100-4810 14660 0 00 1NRUO 03204139 97 32100707 403 1150 105 90 1 111651 490 3 227 6 4 165 480 874 ^^^ ^^^^ ^^ ^ ^ ^ ^ ^ ^^^ - D (wind direction) noteworthy differences: deck 874 D = deck 926 D + 10 (42%).
A W D A A L L T N S P B WP D S T TB B D Y M D H A O ITTLDV I I I CD W V V WW L PI AT BT P S S NCH CC W W W S S S T TS 1 B C R O Y R T N MCIISS D I D 1I DI WI V W1 PA PT TI TI T I TNHLIHMH D P H D P H I LI 0 1 K 20011224 600 3980 15830 0 23 1LAON4 US02904139098 32102104 00 600 400 20 1 1507630453 7 729 7 7 165 193 926 20011224 600 3980 15830 0 0000 1LAON4 03004139 98 32102104 03 600 40 20 1 150763 453 7 729 7 7 165 193 874 ^^^^ ^^ ^^ ^ ^ ^ ^ ^^^ - WI (wind speed indicator) noteworthy differences: deck 926 WI = 4 - knot, measured and deck 874 WI = 3 - knot, estimated (81%).
- IT (indicator for temperatures) noteworthy differences: deck 926 IT = 0 - tenths °C and deck 874 IT = 3 - °C mixed precision (85%).
- SI (SST method indicator) noteworthy differences: deck 926 SI = 1 - condenser inlet and deck 874 SI = 3 - hull contact sensor (33%).
A W D A A L L T N S P B WP D S T TB B D Y M D H A O ITTLDV I I I CD W V V WW L PI AT BT P S S NCH CC W W W S S S T TS 1 B C R O Y R T N MCIISS D I D 1I DI WI V W1 PA PT TI TI T I TNHLIHMH D P H D P H I LI 0 1 K 2003 311 300 3360 28800 0 24 1WPVD US0 604 82098 22101821 270 1560 1280 110 1 21777205 0 3 2 2 4 4 165 206 926 2003 311 300 3360 28800 0 0024 1WPVD 0 603 82 98 22101821 273 1560 128 110 1 217772 5AA 3 2 2 4 4 165 206 874 ^^ ^^ ^ ^ ^ ^ ^ ^^ ^^^ 2000 621 600 4850 18520 0 23 1C6CW9 US0 604 77098 22101407 100 800 701 61 1 8088705 0 5 318 6 5 165 160 926 2000 621 600 4850 18520 0 0023 1C6CW9 0 604 77 98 22101407 103 800 70 60 3 80887 5AA 5 318 6 5 165 160 874 ^^ ^^ ^ ^ ^ ^ ^ ^ ^^ ^^^ - VV (visibility) noteworthy differences: no pattern.
- WW (present weather) noteworthy differences: no pattern.
- W1 (past weather) noteworthy differences: no pattern.
- SLP (sea level pressure) noteworthy differences: no pattern.
- A (barometric tendency) noteworthy differences: no pattern.
- PPP (barometric tendency) noteworthy differences: no pattern.
- AT (air temperature) noteworthy differences: no pattern.
- WBT (wet-bulb temperature) noteworthy differences: no pattern.
- SST (sea surface temperature) noteworthy differences: no pattern.
- N (total cloud amount) noteworthy differences: deck 926 N = 8 oktas and deck 874 N = missing (28%).
- NH (lower cloud amount) noteworthy differences: deck 926 NH = 0 oktas/8 oktas and deck 874 NH = missing (38%)/(29%).
- CL (low cloud type) noteworthy differences: deck 926 CL = missing/0 - none and deck 874 CL = A - not visible (79%)/(09%).
- CM (middle cloud type) noteworthy differences: deck 926 CM = missing/0 - none and deck 874 CM = A - not visible (91%)/(05%).
- CH (high cloud type) noteworthy differences: deck 926 CH = missing/0 - none and deck 874 CH = A - not visible (32%)/(66%).
- H (cloud height) noteworthy differences: deck 926 H = missing and deck 874 H = A - not known (57%).
A W D A A L L T N S P B WP D S T TB B D Y M D H A O ITTLDV I I I CD W V V WW L PI AT BT P S S NCH CC W W W S S S T TS 1 B C R O Y R T N MCIISS D I D 1I DI WI V W1 PA PT TI TI T I TNHLIHMH D P H D P H I LI 0 1 K 2005 2 3 0 2060 19730 0 65 1KRGB US0 404103098 22100607 150 2560 2110 190 1 235882022 5 335 7 7 165 233 926 2005 2 3 0 2060 19730 0 0065 1KRGB 0 804113 10072 0 235 3 86 A AAA 165 233 874 ^^ ^^ ^ ^ ^^^ ^^ ^^^ ^^ ^^^ ^^^^ ^^^ ^ ^^^^^^^^^^ ^ ^^^ ^ ^ ^^^ 2006 7 6 600 2800 26600 0 21 1WTDO US01404 82096816101368 10 254 0 230 88 04 3 1 165 240 926 2006 7 6 600 2800 26600 0 0021 1WTDO 01404 82 96816101368 13 254 230 1 2778 A 4AA 3 1 165 240 874 ^^ ^^ ^ ^ ^ ^ ^^^ ^^^ ^^ ^^^ 2000 616 900 5000 22990 0 33 1WXBZ US03203 72098 0 103307 200 1150 1001 88 0000900 1 227 4 3 165 128 926 2000 616 900 5000 22990 0 0033 1WXBZ 03203 72 98 0 103307 203 1150 100 90 0 A 9AA 1 227 4 3 165 128 874 ^^ ^^ ^ ^ ^ ^^ ^^^ ^^ ^^^ 2000 229 600 2960 32960 0 23 1WMBK US01203103098 102234 00 2000 1780 160 1 19444804 0 4 311 8 5 165 246 926 2000 229 600 2960 32960 0 0023 1WMBK 01203103 98 102234 03 2000 178 160 1 194448 4AA 4 311 8 5 165 246 874 ^^ ^^ ^ ^ ^ ^ ^^ ^^^ 2000 4261800 4760 18040 0 23 1C6CW9 US02604129093 22100554 01 600 501 39 1 609 0 4 414 9 6 165 160 926 2000 4261800 4760 18040 0 0023 1C6CW9 02604128 93 22100554 03 600 50 40 3 609 A AAA 4 414 9 6 165 160 874 ^^ ^^ ^^ ^ ^ ^^ ^ ^^^^^ ^^^ - WP (wave period) noteworthy differences: deck 926 WP = missing and deck 874 WP = 0 sec (32%).
A W D A A L L T N S P B WP D S T TB B D Y M D H A O ITTLDV I I I CD W V V WW L PI AT BT P S S NCH CC W W W S S S T TS 1 B C R O Y R T N MCIISS D I D 1I DI WI V W1 PA PT TI TI T I TNHLIHMH D P H D P H I LI 0 1 K 2002 8291800 4300 21500 0 25 1WNDP US01104 5098 10102662 110 1880 1500 130 1 1990000900 028 165 163 926 2002 8291800 4300 21500 0 0025 1WNDP 01104 10 98 10102662 113 1880 150 130 1 1990 A 9AA 0 02810 4 165 163 874 ^^ ^^ ^^^ ^ ^ ^^^ ^^ ^ ^^ ^ ^^^ - WH (wave height) noteworthy differences: no pattern.
- SD (swell direction) noteworthy differences: no pattern.
- SP (swell period) noteworthy differences: no pattern.
- SH (swell height) noteworthy differences: no pattern.
A W D A A L L T N S P B WP D S T TB B D Y M D H A O ITTLDV I I I CD W V V WW L PI AT BT P S S NCH CC W W W S S S T TS 1 B C R O Y R T N MCIISS D I D 1I DI WI V W1 PA PT TI TI T I TNHLIHMH D P H D P H I LI 0 1 K 2005 1301800 2710 21190 0 55 1KRGB US02004 77098 20101882 280 217 0 210 342045 3 13012 8 165 235 926 2005 1301800 2710 21190 0 0055 1KRGB 0 604108 10210 0 213 A AAA 165 235 874 ^^ ^^ ^^ ^^^^^^ ^^ ^^^^ ^^ ^ ^ ^^^ ^^^^^^^ ^ ^^^^^ ^ ^^^ - IX (station/weather indicator) noteworthy differences: deck 926 IX = 1 - manned included and deck 874 IX = 3 - manned omitted (22%).
ID (identification/call sign) KRGB excluded (vs. included)
Figure 3. As for Figure 1 except deck 927 (+) and deck 874 (x).
Examples 3. Transient matches between decks 927 vs. 874 (keyed vs. SEAS).
- LAT (latitude) noteworthy differences: deck 874 LAT = deck 927 LAT +/- 0.1 (46%/39%).
- LON (longitude) noteworthy differences: deck 874 LON = deck 927 LON +/- 0.1 (44%/33%).
A W D A A L L T N S P B WP D S T TB B D Y M D H A O ITTLDV I I I CD W V V WW L PI AT BT P S S NCH CC W W W S S S T TS 1 B C R O Y R T N MCIISS D I D 1I DI WI V W1 PA PT TI TI T I TNHLIHMH D P H D P H I LI 0 1 K 2005 111 0 4600 32480 0 0014 1WPVD US03004 98 98252101652 120 1000 83 60 1 153552 4AA 165 174 927 2005 111 0 4610 32490 0 0014 1WPVD 03004 98 98252101652 120 1000 83 67 1 153662 3AA 165 174 874 ^ ^ ^^ ^ ^^ ^ ^^^ - DS (ship course) noteworthy differences: no pattern.
- VS (ship speed) noteworthy differences: no pattern.
- ID (identification) noteworthy differences: deck 927 ID = C6CE7/WDA3673/WDB9135 and deck 874 ID = H9IM/WPVF/WQZ9670 (55%/27%/18%).
Note: The final example does not appear to be a duplicate.A W D A A L L T N S P B WP D S T TB B D Y M D H A O ITTLDV I I I CD W V V WW L PI AT BT P S S NCH CC W W W S S S T TS 1 B C R O Y R T N MCIISS D I D 1I DI WI V W1 PA PT TI TI T I TNHLIHMH D P H D P H I LI 0 1 K 2001 715 600 5450 19330 0 0063 1C6CE7 US02204134 97 10100207 300 1300 120 110 885 5AA 4 323 4 4 165 125 927 2001 715 600 5450 19330 0 0063 1H9IM 02204134 97 10100207 303 1300 120 110 885 5AA 4 323 4 4 165 125 874 ^^^^^ ^^ ^ ^^^ 2001 2 4 600 3720 28850 0 0024 1WDA3673 US03504 41 97 20102724 00 600 40 20 1 2347 A 5AA 6 235 8 4 165 206 927 2001 2 4 600 3720 28850 0 0024 1WPVF 03504 41 97 20102724 03 600 40 20 1 2347 A 5AA 6 235 8 4 165 206 874 ^^^^^^ ^^ ^ ^^^ 2006 515 600 4530 27440 0 00 1WDB9135 US0 504 41 98 2210149 0 80 1 20885 A00 2 2 165 169 927 2006 515 600 4590 27460 0 00 1WQZ9670 03304 41 A AAA 165 169 874 ^ ^ ^^ ^^^ ^^ ^^ ^^ ^^^^^^^ ^ ^^ ^ ^^^^^ ^^ ^ ^ ^^^ - D (wind direction) noteworthy differences: deck 874 D = deck 927 D + 10 (46%).
A W D A A L L T N S P B WP D S T TB B D Y M D H A O ITTLDV I I I CD W V V WW L PI AT BT P S S NCH CC W W W S S S T TS 1 B C R O Y R T N MCIISS D I D 1I DI WI V W1 PA PT TI TI T I TNHLIHMH D P H D P H I LI 0 1 K 2001 217 0 4910 20620 0 00 1C6OQ8 US02404 57 96125100101 100 45 50 3 90 A 1AA 1610 8 165 162 927 2001 217 0 4910 20620 0 0023 1C6OQ8 02504 57 96125100101 103 450 45 50 3 90 A AAA 4 31610 8 165 162 874 ^^ ^^ ^ ^ ^ ^^ ^ ^ ^ ^^^ - WI (wind speed indicator) noteworthy differences: deck 927 WI = 4 - knot, measured and deck 874 WI = 3 - knot, estimated (79%).
- W (wind speed) noteworthy differences: no pattern.
- VV (visibility) noteworthy differences: no pattern.
- WW (present weather) noteworthy differences: no pattern.
- W1 (past weather) noteworthy differences: no pattern.
- SLP (sea level pressure) noteworthy differences: no pattern.
- A (barometric tendency) noteworthy differences: no pattern.
- PPP (barometric tendency) noteworthy differences: no pattern.
- IT (indicator for temperatures) noteworthy differences: deck 927 IT = 0 - tenths °C and deck 874 IT = 3 - °C mixed precision (99%).
A W D A A L L T N S P B WP D S T TB B D Y M D H A O ITTLDV I I I CD W V V WW L PI AT BT P S S NCH CC W W W S S S T TS 1 B C R O Y R T N MCIISS D I D 1I DI WI V W1 PA PT TI TI T I TNHLIHMH D P H D P H I LI 0 1 K 2005 5211500 2700 27120 0 0062 1WTEO US03204 62 97 32101212 110 2680 250 250 1 283552 500 2 28 3 2 165 241 927 2005 5211500 2700 27120 0 0062 1WTEO 03203 62 97 32101212 113 2680 250 250 1 283552 500 2 128 3 2 165 241 874 ^^ ^ ^ ^ ^^^ - AT (air temperature) noteworthy differences: no pattern.
- WBTI (WBT indicator) noteworthy differences: alternate being missing.
- WBT (wet-bulb temperature) noteworthy differences: no pattern.
- DPT (dew-point temperature) noteworthy differences: deck 927 DPT in whole degrees (69%).
A W D A A L L T N S P B WP D S T TB B D Y M D H A O ITTLDV I I I CD W V V WW L PI AT BT P S S NCH CC W W W S S S T TS 1 B C R O Y R T N MCIISS D I D 1I DI WI V W1 PA PT TI TI T I TNHLIHMH D P H D P H I LI 0 1 K 2006 9121800 3250 24200 0 0071 1WSD7079 US03204 62 98 22101462 30 1800 160 150 1 204555 400 3 126 6 2 165 202 927 2006 9121800 3250 24200 0 0071 1WSD7079 03203 62 98 22101462 30 1800 160 148 1 204555 400 3 126 6 2 165 202 874 ^^ ^ ^^ ^^^ - SI (SST method indicator) noteworthy differences: alternate being missing.
- SST (sea surface temperature) noteworthy differences: no pattern.
- N (total cloud amount) noteworthy differences: deck 927 N = 8 oktas (45%).
A W D A A L L T N S P B WP D S T TB B D Y M D H A O ITTLDV I I I CD W V V WW L PI AT BT P S S NCH CC W W W S S S T TS 1 B C R O Y R T N MCIISS D I D 1I DI WI V W1 PA PT TI TI T I TNHLIHMH D P H D P H I LI 0 1 K 2001 2161200-7730 16590 0 0082 1NRUO US01703164 96464 98410 200 -47 -60 886 AAA 20 3 4 165 590 927 2001 2161200-7730 16590 0 0082 1NRUO 01704164 96464 98410 203 -47 -60 786 AAA 2 220 3 4 165 590 874 ^^ ^ ^ ^ ^ ^ ^^^ - NH (lower cloud amount) noteworthy differences: deck 927 NH = 0 oktas/8 oktas and deck 874 NH = missing (34%)/(20%).
A W D A A L L T N S P B WP D S T TB B D Y M D H A O ITTLDV I I I CD W V V WW L PI AT BT P S S NCH CC W W W S S S T TS 1 B C R O Y R T N MCIISS D I D 1I DI WI V W1 PA PT TI TI T I TNHLIHMH D P H D P H I LI 0 1 K 2006 414 600 2950 27150 0 0043 1WTDO US02604 26 97 0 10203 0 2100 200 200 1 20400A 9AA 3 1 165 241 927 2006 414 600 2950 27150 0 0043 1WTDO 02604 26 97 0 10203 3 2100 200 200 1 2040 A 9AA 3 1 165 241 874 ^^ ^ ^ ^^^ 2003 4 9 600 3720 29150 0 0024 1KRLZ US0 604 36 98 101807 100 1750 155 140 1 226886 3AA 3 1 4 4 165 207 927 2003 4 9 600 3720 29150 0 0024 1KRLZ 0 604 36 10180 100 1751 155 143 1 2268 6 3AA 3 3 1 4 4 165 207 874 ^^ ^^ ^ ^ ^ ^ ^ ^^^ - CL (low cloud type) noteworthy differences: deck 927 CL = 0 - none and deck 874 CL = A - not visible (31%).
- CM (middle cloud type) noteworthy differences: deck 927 CM = 0 - none and deck 874 CM = A - not visible (55%).
- CH (high cloud type) noteworthy differences: deck 927 CM = 0 - none and deck 874 CM = A - not visible (55%).
- H (cloud height) noteworthy differences: no pattern.
A W D A A L L T N S P B WP D S T TB B D Y M D H A O ITTLDV I I I CD W V V WW L PI AT BT P S S NCH CC W W W S S S T TS 1 B C R O Y R T N MCIISS D I D 1I DI WI V W1 PA PT TI TI T I TNHLIHMH D P H D P H I LI 0 1 K 2005 525 0 2670 26600 0 0082 1WTEO US01404 31 98 10100887 80 2600 240 230 1 278000 900 1 121 4 1 165 240 927 2005 525 0 2670 26600 0 0082 1WTEO 01404 31 98 10100887 83 2600 240 230 1 2780 A 9AA 1 121 4 1 165 240 874 ^^ ^ ^^ ^^ ^^^ - WP (wave period) noteworthy differences: no pattern.
- WH (wave height) noteworthy differences: deck 927 WH = missing (85%).
A W D A A L L T N S P B WP D S T TB B D Y M D H A O ITTLDV I I I CD W V V WW L PI AT BT P S S NCH CC W W W S S S T TS 1 B C R O Y R T N MCIISS D I D 1I DI WI V W1 PA PT TI TI T I TNHLIHMH D P H D P H I LI 0 1 K 2006 3271500 1860 27250 0 0051 1WTEO US0 804 72 98 20101972 100 2500 225 210 1 268112 500 1 6 5 1 165 277 927 2006 3271500 1860 27250 0 0051 1WTEO 0 804 72 98 20101972 103 2500 225 210 1 268112 500 1 1 6 5 1 165 277 874 ^^ ^ ^ ^^^ - SD (swell direction) noteworthy differences: no pattern.
- SP (swell period) noteworthy differences: no pattern.
- SH (swell height) noteworthy differences: no pattern.
- IX (station/weather indicator) noteworthy differences: deck 927 IX = 3 - manned omitted and deck 874 IX = 1 - manned included (100%).
- W2 (second past weather) noteworthy differences: no pattern.
Appendix A - Duplicate Elimination Results
Certainty of transient matches was indicated by dup status (DUPS; ref. IMMA documentation) with the following values:
0 unique
1 best duplicate
2 best duplicate with substitution
3 uncertain: uncertain weather element with hour cross'
4 uncertain: uncertain weather element with no cross'
5 uncertain: uncertain weather element with day cross'
6 uncertain: time/space'
7 uncertain: certain weather element with hour cross'
8 certain: certain weather element with no cross
9 certain: uncertain weather element with time/space
10 certain: certain weather element with time/space
11 certain: time/space/id
12 certain: uncertain weather element with time/space/id
13 certain: certain weather element with time/space/id
Where "certain weather element" was contingent on how many of wind speed, visibility, present weather, first past weather, sea level pressure, air temperature, and sea surface temperature were in common, and how many were different. Allowances which would have permitted some differences to not count were deactivated, as were hour and day crosses. Almost all transient matches were DUPS 13, the most certain, and 71% of the DUPS 11 matches had ID of KRGB. Seven weather elements in common with zero different followed by four in common with zero different were the most frequent matching criteria (Fig. 4).
Figure 4. Total 2000-07 deck 874 transient matches a) [left] DUPS per deck and b) [right] weather elements in common and different (listed vertically).
Surprisingly the output SEAS data were 96% unique. Because only 22% were unique for hundredths of hour equal to zero and hundredths never exceeded 59 (Fig. 5), it appears that minutes were not translated. Curiously Examples 4 show SEAS data matching NCEP BUFR data in which the attached GTS raw strings did not have a minutes group.
Figure 5. Total 2000-07 deck 874 DUPS per hundredths of hour.
Examples 4. Hour patterns after sort by call sign.
A W D A A
L L T N S P B WP D S T TB B D
Y M D H A O ITTLDV I I I CD W V V WW L PI AT BT P S S NCH CC W W W S S S T TS 1 B C
R O Y R T N MCIISS D I D 1I DI WI V W1 PA PT TI TI T I TNHLIHMH D P H D P H I LI 0 1 K
2005 123 600 4160 15590 04 024 1A8DV4 03203149 95727100706 15 51 5 5 1 100887 7AA 910 11010 165 15715792
2005 123 556 4160 15590 030024 1A8DV4 03203149 95727100706 150 51 5 5 1 100887 7AA 910 11010 165 15715874
2005 1231800 4160 16020 04 024 1A8DV4 03203190 2100406 5 100 10 10 1 10088A 74A 912341012 165 15810792
2005 1231751 4160 16020 030024 1A8DV4 03203190 2100406 53 100 10 10 1 10088A 74A 912341012 165 15810874
2005 1231200 3630 34670 04 074 1HZZD 03203 26 98 1102036 57 1400 110 90 1 120436 742 4 032 165 21263792
2005 1231142 3630 34670 030074 1HZZD 03203 26 98 1102036 573 1400 110 80 1 120436 742 4 032 165 21263874
2005 1232300 3660 34240 04 034 1HZZD 01603 26 98 2101926 9 1500 140 130 1 120547 742 3 016 165 21267792
2005 1232335 3660 34240 030034 1HZZD 01603 26 98 2101926 93 1500 140 130 1 120547 742 3 016 165 21267874
2005 1231300 2230 28920 04 034 1KCGH 02204 62 98 20101751 15 2390 183 150 1 239331 6AA 8 1 510 3 165 24220792
2005 1231300 2230 28920 030034 1KCGH US02204 62 98 10101751 150 2390 183 150 1 239331 6AA 8 510 3 165 24220927
2005 1231327 2230 28920 030034 1KCGH 02204 62 98 20101751 150 2390 183 151 1 239331 6AA 8 1 510 3 165 24220874
2005 123 600 5220 20790 04 024 1KGTY 02903 72 98 22 99202 4 280 17 0 881 42A 4 23012 3 165 12622792
2005 123 537 5220 20790 030024 1KGTY 02903 72 98 22 99202 40 280 17 1 881 42A 4 23012 3 165 12622874
2005 1231800 5130 21440 04 024 1KGTY 02403 87 98806 99621 3 500 44 30 664 46A 6 42612 4 165 12715792
2005 1231743 5130 21440 030024 1KGTY 02403 87 98806 99621 33 500 44 40 664 46A 6 42612 4 165 12715874
2005 123 600 4340 29550 04 054 1KHRK 0 704 67 98 2102007 30 -30 1 19889 37A 2 2 4 5 2 165 17134792
2005 123 536 4340 29550 030054 1KHRK 0 704 67 98 2102007 300 -30 1 19889 37A 2 2 4 5 2 165 17134874
2005 1231500 4110 29320 04 054 1KHRK 01703 98 96256 98307 60 1 61669 278 4 427 5 7 165 17116792
2005 1231451 4110 29320 030054 1KHRK 01703 98 96256 98307 600 1 61669 278 4 427 5 7 165 17116874
2005 1231800 4080 29230 04 064 1KHRK 02403159 97605 98007 30 80 1 58889 24A 4 522 6 9 165 171 7792
2005 1231750 4080 29230 030064 1KHRK 02403159 97605 98007 300 80 1 58889 24A 4 522 6 9 165 171 7874
2005 1232100 4060 29140 04 063 1KHRK 03623268 93887 98503 50 20 1 69886 2AA 5 7 1 812 165 171 8792
2005 1232046 4060 29140 030063 1KHRK 03613267 93887 98503 500 20 1 69886 2AA 5 7 1 812 165 171 8874
2005 123 600 4640 23410 04 022 1LAJV4 02003232 91414101302 25 1050 100 100 1 1209 A 165 16565792
2005 123 610 4640 23410 030022 1LAJV4 02003231 91414101302 253 1050 100 100 1 1209 A AAA 165 16565874
2005 1231200 4630 23500 04 022 1LAJV4 01903144 91414101504 0 950 85 80 1 118 A 165 16565792
2005 1231137 4630 23500 030022 1LAJV4 01903144 91414101504 03 950 85 80 1 118 A AAA 165 16565874
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