ICOADS Web information page (Wednesday, 25-Jul-2012 18:06:44 UTC):

Chinese/Global Ocean Data Archeology and Rescue (GODAR) Ships (deck 781) (by ESRL)


As part of the Global Ocean Data Archeology and Rescue (GODAR) project, surface marine ship data were digitized in China. The data were received at NCAR (http://rda.ucar.edu/datasets/ds541.4/) from NCDC on CD-ROM.
coverage map
Figure 1. Coverage for the period of record 1968-93 (414,409 unique output reports).

IMMA supplemental data and conversion to other IMMA elements
         MARINE METEOROLOGICAL OBSERVATION DATA FORMAT DESCRIPTION                          imma
  ************************************************************************************
   Po.No.      element                     description                                      abbr
  ------------------------------------------------------------------------------------
    1 - 4      ship code                   4 characters                                     id
    5 - 8      year (GMT)                  1900-present                                     yr
    9 -10      month                       1-12                                             mo
   11 -12      day                         1-31                                             dy
   13 -14      hour                        0-23                                             hr
   15 -16      latitude  degree            0-90                                             lat
   17 -20      latitude  minute            0.0-59.9
   21 -21      hemisphere(N or S)
   22 -24      longitude degree            0-180                                            lon
   25 -28      longitude minute            0.0-59.9
   29 -29      hemisphere(E or W)
   30 -32      voyage direction            1-360, 888 for unknown and 999 for missing       ds
   33 -36      voyage speed                knots, -9.9 for missing, -8.8 for unknown        vs
   37 -38      total cloud amount          0-11, // for unknown,blank for missing           n
                                           0:clear or less then 1/20
                                           1:                   1/10
                                           2:                   2/10
                                           3:                   3/10
                                           4:                   4/10
                                           5:                   5/10
                                           6:                   6/10
                                           7:                   7/10
                                           8:                   8/10
                                           9:                   9/10
                                          10:                  10/10
                                          11: The celestial dome is almost entirely covered,
                                              but with a few chinks.

   39 -40      lower cloud amount           0-11, // for unknown,blank for missing          nh
   41 -44      type of high cloud          Ci Cs Cc                                         
   45 -48      type of middle cloud        As Ac                                            
   49 -52      type of low cloud           Cu Cb Sc St Ns Fn                                
                                           '////' for unknown
                                           '    ' for no cloud
   53 -56      cloud height                0000-9000, '8888' for unknown,'9999' for missing h
   57 -58      visibility                  90-99 blank and '//' for missing or unknown      vv
                                           90:<50m
                                           91:50m-200m
                                           92:200m-500m
                                           93:500m-1km
                                           94:1-<2km
                                           95:2-<4km
                                           96:4-<10km
                                           97:10-<20km
                                           98:20-<50km
                                           99:>=50km
   59 -60      present weather                                                              ww
                                           the following codes mean:
                                           00: no follow weather phenomenon
                                           05: haze
                                           10: mist
                                           17: thunderstorm
                                           19: squall
                                           45: fog
                                           50: drizzle
                                           60: rain
                                           69: rain or drizzle and snow
                                           70: snow
                                           80: rain shower
                                           89: hail shower
                                           95: thunderstorm with rain and/or snow
                                           The other codes use WMO 4677.
                                           blank for unknown and '//'for missing
   61 -61      past weather                0-9                                              w1
   62 -62      2nd past weather            0-9                                              w2
   63 -66      wave height                 0.0-50.0 99.9 for missing and 88.8 for unknown   wh

   67 -69      swell direction             same as wind direction                           sd
   70 -73      swell height                meter                                            sh

   74 -74      wind indicator              0,1 no use
   75 -77      wind direction              0-359,361 for calm and 362 for variable          d
   78 -81      wind speed                  meters per second                                w
   82 -86      air temp.                   celsius degree                                   at
                                           -99.9 for missing and -88.8 for unknown

   87 -91      wet bulb temp.              celsius degree                                   wbt
                                           -99.9 for missing and -88.8 for unknown

   92 -97      sea level pressure          hPa                                              slp
                                           9999.9 for missing and 8888.8 for unknown
   98-102      sea surface temp.           celsius degree                                   sst

  103-108      salinity                    99.999 for miss and 88.888 for unknown
  109-109      sea luminance               0: no
                                           1: yes
                                           9 for missing and 8 for unknown
  110-110      mark '*'

  111-111     date  flag                  '1' query
  112-112     location  flag
  113-113     landlock  flag
  114-114     air temp. flag
  115-115     wetbulb temp. flag
  116-116     sea surface temp. flag
  117-117     cloud  flag
  118-118     wind  flag
  119-119     wave  flag
  120-120     sea level pressure  flag
  121-121     weather  flag
  122-122     mark '*'
  -------------------------------------------------------------------------------------
  * GENERALLY BLANK MEANS MISSING OBSERVATION
Elements requiring conversion of units
Equal ("=") signifies conversion from input unit to output unit.
15 -16 latitude degree, 17 -20 latitude minute, 21 -21 hemisphere(N or S)
=[- if hemisphere=S](latitude_degree + (latitude_minute / 60.))
22 -24 longitude degree, 25 -28 longitude minute, 29 -29 hemisphere(E or W)
=[360. - if hemisphere=W](longitude_degree + (longitude_minute / 60.))
30 -32 voyage direction
total
0=0 5185
1=8 26253
2=8 11824
3=8 10737
4=8 27113
5=8 23284
6=8 3715
7=8 9787
8=8 24646
9=8 326
10=8 336
11=8 27
12=8 182
13=8 67
14=8 21
15=8 112
16=8 38
17=8 39
18=8 33
19=8 81
20=8 131
21=8 46
22=8 105
23=1 69
. . .
337=7 810
338=8 598
339=8 66
340=8 285
341=8 45
342=8 63
343=8 45
344=8 59
345=8 112
346=8 44
347=8 23
348=8 59
349=8 70
350=8 210
351=8 34
352=8 66
353=8 144
354=8 55
355=8 398
356=8 87
357=8 233
358=8 179
359=8 112
360=8 453
888=9 5
33 -36 voyage speed
0.0-0.4=0, 0.5-5.4=1, 5.5-10.4=2, 10.5-15.4=3, 15.5-20.4=4, 20.5-25.4=5, 25.5-30.4=6, 30.5-35.4=7, 35.5-40.4=8, 40.5-99.9=9, -9.9=missing, -8.8=missing
37 -38 total cloud amount
0=0, 1=1, 2=2, 3=2, 4=3, 5=4, 6=5, 7=6, 8=6, 9=7, 10=8, 11=8
39 -40 lower cloud amount
0=0, 1=1, 2=2, 3=2, 4=3, 5=4, 6=5, 7=6, 8=6, 9=7, 10=8, 11=8
41 -44 type of high cloud
an inventory of this unconverted element follows
                                                                         total
    CH  ////                                                             35367
    CH  CC                                                                4942
    CH  CCCI                                                                11
    CH  CCCS                                                                 3
    CH  CI                                                               12412
    CH  CICC                                                                30
    CH  CICS                                                              5262
    CH  CS                                                                7409
    CH  CSCC                                                                11
    CH  CSCI                                                                29
45 -48 type of middle cloud
an inventory of this unconverted element follows
                                                                         total
    CM  ////                                                             34103
    CM  AC                                                               24010
    CM  ACAC                                                                 8
    CM  ACAS                                                               926
    CM  AS                                                               22958
    CM  ASAC                                                             12002
    CM  ASAS                                                                 9
49 -52 type of low cloud
an inventory of this unconverted element follows
                                                                         total
    CL  ////                                                             37285
    CL  CB                                                                1401
    CL  CBCU                                                                81
    CL  CBFN                                                                 9
    CL  CBNS                                                               147
    CL  CBSC                                                                56
    CL  CBST                                                                 8
    CL  CU                                                               36540
    CL  CUCB                                                               166
    CL  CUFN                                                                 9
    CL  CUNS                                                               129
    CL  CUSC                                                             15572
    CL  CUST                                                                70
    CL  FN                                                                7028
    CL  FNCB                                                                 9
    CL  FNCU                                                                 2
    CL  FNNS                                                                87
    CL  FNSC                                                                 1
    CL  FNST                                                                 1
    CL  NS                                                                6905
    CL  NSCB                                                               228
    CL  NSCU                                                               200
    CL  NSFN                                                               177
    CL  NSNS                                                                 1
    CL  NSSC                                                               131
    CL  NSST                                                               144
    CL  SC                                                               27444
    CL  SCCB                                                                63
    CL  SCCU                                                              1111
    CL  SCFN                                                                 8
    CL  SCNS                                                               109
    CL  SCSC                                                                 1
    CL  SCST                                                                35
    CL  ST                                                               19941
    CL  STCB                                                                18
    CL  STCU                                                                47
    CL  STFN                                                                 7
    CL  STNS                                                                69
    CL  STSC                                                                52
53 -56 cloud height
0-149=0, 150-299=1, 300-599=2, 600-999=3, 1000-1999=4, 2000-3499=5, 3500-4999=6, 5000-6499=7, 6500-7999=8, 8000-8887=9, 8888=missing, 8889-9998=9, 9999=missing
63 -66 wave height
=round(wave_height * 2)
0.0=0, 0.1=0, 0.2=0, 0.3=1, 0.4=1, 0.5=1, 0.6=1, 0.7=1, 0.8=2, ... 49.2=98, 49.3=99, 49.4=99, 49.5=99, 49.6=99, 49.7=99, 88.8=missing, 99.9=missing
67 -69 swell direction
total
0=0 32172
1=36 28
2=36 32
3=36 15
4=36 13
5=1 90
6=1 17
7=1 7
8=1 29
9=1 14
10=1 3983
11=1 4
. . .
349=35 2
350=35 3370
351=35 5
352=35 7
353=35 5
354=35 8
355=36 77
356=36 6
357=36 3
358=36 7
359=36 2
360=36 4587
888=missing 25
999=missing 113
70 -73 swell height
=round(swell_height * 2)
0.0=0, 0.1=0, 0.2=0, 0.3=1, 0.4=1, 0.5=1, 0.6=1, 0.7=1, 0.8=2, ... 49.2=98, 49.3=99, 49.4=99, 49.5=99, 49.6=99, 49.7=99, 88.8=missing, 99.9=missing
75 -77 wind direction
total
0=361 5324
1=1 500
2=2 205
3=3 244
4=4 308
5=5 253
6=6 248
7=7 247
8=8 277
9=9 272
10=10 10762
11=11 255
. . .
349=349 241
350=350 9350
351=351 267
352=352 260
353=353 292
354=354 248
355=355 307
356=356 276
357=357 250
358=358 364
359=359 242
360=360 16005
361=361 12
362=362 1
888=missing 1
Additional IMMA elements

TI time indicator = 0 = nearest whole hour
LI lat/lon indicator = 4 = degrees and minutes
II id indicator = 1 = ship, OSV, or ice station call sign
DI wind direction indicator = 5 = 360-point compass
WI wind speed indicator = 1 = meter per second, measured
IT indicator for temperatures = 0 = degrees Celsius and tenths
DCK deck = 781 = Chinese/Global Ocean Data Archeology and Rescue (GODAR) Ships
SID source ID = 143 = Chinese/Global Ocean Data Archeology and Rescue (GODAR) Ships
PT platform type = 5 = ship

Assessments of data quality

QC chart
Figure 2. Number of reports per year plotted separately to show the trimming flag value, within those reports, for these variables: SF = sea surface temperature, AF = air temperature, UF and VF = wind U and V components, PF = sea level pressure, RF = relative humidity. The trimming flags are defined as follows, where a1 is the individual observation under scrutiny, g is the smoothed median, and s1 and s5 are the smoothed lower and upper median deviation:
F = data missing or not computable
E = data unusable (SF, AF, and PF, only)
C = limits missing (ocean/coastal box)
7 = greater than 4.5 sigma upper limit (a1 > g + 4.5*s5)
6 = less than 4.5 sigma lower limit (a1 < g - 4.5*s1)
5 = greater than 3.5 sigma upper limit (g + 3.5*s5 < a1 <= g + 4.5*s5)
4 = less than 3.5 sigma lower limit (g - 4.5*s1 <= a1 < g - 3.5*s1)
3 = greater than 2.8 sigma upper limit (g + 2.8*s5 < a1 <= g + 3.5*s5)
2 = less than 2.8 sigma lower limit (g - 3.5*s1 <= a1 < g - 2.8*s1)
1 = within 2.8 sigma limits (g - 2.8*s1 <= a1 <= g + 2.8*s5)


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Updated: Jul 25, 2012 18:06:44 UTC
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