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Ocean Current

Data Format of Ocean Current

Ocean current can be downloaded with the JODC Standard Format and ODV Spreadsheet.
(NetCDF is under adjustment)

JODC Standard Format

Structure of Data File
This is what a collection of various data of one station worth followed by only the number of station
Structure of Data for 1 Station
Header Record x 1
Initially, only 1 record exists
Comment Record (if necessary)
Data Record x (number of record)
xists, as much as necessary. after the header record
Number of record : Number of data type x (number of observation per 1 station/6)(any fraction shall be rounded up)

Header Record

Field Item 1 Item 2 Format Item Explanation
001-001 Header Information   A1 Discriminate the Header Record
Always "H"
002-002 End of Station   A1 End of measuring
Always "C"
003-017 Location Latitude I2,I2,I2,A1 ddmmssN(S)
    Longitude I3,I2,I2,A1 dddmmssE(W)
018-025 Date Year, Month, Day I4,I2,I2 yyyymmdd(GMT)
026-031 Time Hour, Minute, Second I2,I2,I2 hhmmss (hour, minute, second) (GMT)
032-033 Country Code   A2 Refer to the Country Code (PDF)
034-038 Observation Institute Code   A1,A2,A2 Refer to the Observation Institute Code, but the Code beginning with @ is WOD Code
039-045 Vessel Code or ID Code   A7 ID No. of Vessel Code, Buoy, etc. : Non-conversion code from the old code is denoted by the "_" to the head of the old one,
but the code beginning with @ is WOD Code
046-048 Navigation Number   I3 Numbers with automatic numbering by year, vessel call sign
049-052 Project Code   A4 efer to the Project Code (PDF)   but the code beginning with @ means WOD Code
053-058 Project Restriction Year, Month I4,I2 Year, month capable of providing
059-062 Water Water Colour A2 Refer to the Meteorology Related Code (PDF)参照
    Transparency A2 Unit: m
063-068 Wind Wind Direction I3
 
Displays 360 degrees
Left justified, when the accuracy falls
    Wind Speed F3.1
A1, I2*
Unit: 00.0m/s
*Denote "L" to the head for the Japan Meteorological Agency Wind Scale (PDF)
069-075 Wind Wave Direction I3 Displays 360 degrees
    Wave Height F3.1
A1, 1X, I1*
Unit: 00.0m
*Denote "L" to the head for the Japan Meteorological Agency Wind Wave Scale (PDF)
    Cycle A1 Unit: second
Denote the alphabet in ascending order if it exceeds 9 seconds
A:10sec, B:11sec, C:12sec, ...
076-082 Swell Direction I3 Unit: degree
    Height of Swell F3.1
A1, 1X, I1*
Unit: 00.0m
*Denote "L" to the head for the Japan Meteorological Agency Swell Scale (PDF)
    Cycle I1 Unit: second
Denote the alphabet in ascending order if it exceeds 9 seconds
A:10sec, B:11sec, C:12sec, ...
083-086 Air Temperature Dry-bulb Value F4.1 Unit: 000.0 degree
087-088 Humidity   I2 Unit: % 2 digits
089-090 Weather   A2 WMO code 4501 or WMO code 4677(Refer to Meteorology Related Code) (PDF)
091-094 Cloud Cloud Amount I2 WMO code 2700(Refer to Meteorology Related Code)(PDF) )
    Cloud Shape A2 WMO code0500(Refer to Meteorology Related Code)(PDF)
095-099 Pressure   F5.1 Unit: 0000.0hPa
100-101 Visibility   I2 Unit: km
102-102 Station Information Error Flag   A1 Flag when there is an error data in the station information in the header.
Refer to the station information error flag (PDF)
103-103 Data Recorder Error Existence Flag   A1 Flag when there is an error data in the station in data record.
Refer to the data recorder error existence flag (PDF)
104-107 Reference No. (1)   A4  Reference number to be given in JODC (Receipt number : year)
108-111 Reference No. (2)   A4  Reference number to be given in JODC (Receipt unit : serial No. of year)
112-115 Reference No. (3)   A4  Reference number to be given in JODC (Serial No. : file unit)

Comment Record

Field Item 1 Item 2 Format Item Explanation
001-001 Record Type   A1 C:comment
002-002 Station End Flag   A1 E: End of measuring
D: End of comment
C: Follow the comments
003-115 Comment   A*  

Data Record

Field Item 1 Item 2 Format Item Explanation
001-001 Record Type   A1 H: Header, D: Data, C: Comment
002-002 Station End Flag   A1 E: End of station
D: End of data type
C: Follow the data
003-004 Data Type   A2 Refer to Data Type Code Table (PDF)
005-009 Measuring Unit Code Large Classification A2 Refer to Measuring Unit Code Table (PDF)
  Measuring Unit Code Small Classification A3 Refer to Measuring Unit Code Table (PDF)
010-017 Data Unit   A8 Refer to Data Unit Code Table (PDF)
018-019 Bathymetry Unit   A2 Refer to Bathymetry Unit Code Table (PDF)
020-020 Number of Digits Number of Digits of Data I1 Number of digits of data column
021-021 Exponent Number of digits below the decimal point of data I1 Number of digits below the decimal point, out of data columns
Each Data Item 1 Bathymetry   F6.1 Unit: 00000.0m
Each Data Item 2 Current Direction Data   F4.1 Unit: 000.0 degrees
Each Data Item 3 Current Speed Data   Undecided Observation value
Format is determined by "Number of Digits" and "Exponent"
Each Data Item 4 Data Accuracy   A1 Refer to Data Accuracy Code Table (PDF)
Each Data Item 5 Data Processing Flag   A1 Refer to Data Processing Flag Table (PDF)

ODV Spreadsheet Format

ODV spreadsheet is a format adopted by the oceanographic data visible software, Ocean Data View developed by the Ocean Data View of Germany and employs more restricted generic format. This is a high readable tab-delimited ASCII text format

Data Indication Example


General
 ASCII Code
File Extension
.txt
Column Separation Symbol
 Tub
First line : Column and Label
  1. Standard Header Label :Cruise, Station, Type, mon/day/yr, hh:mm, Lon.(゜E), Lat.(゜N), Bot. Depth[m]
  2. There is a Quality Flag (QF) in each column of data variables.
  3. Affixed measuring instrument of FETI(PDF) to the "InstType"
To the final line from the second line : data line
  1. Each line is comprised of the metadata and one data observation layer.
  2. Cruise sorts out the data by every vessels and observation periods with extracted data to affix the navigation number.
  3. As to the "Type" of the station , the stations less than 250 layers with one letter is "B" and the stations
  4. Insert "0" in case there is no Bot. Depth data.
Quality Flag and Column
  1. Quality flag is one digit integer : 0= good, 1= unknown, 4= questionable, 8= bad
  2. Reflected Station Information Error Flag of FETI (PDF) in the "InstType" quality flag (QF) of ODV spreadsheet
    FETI023456789
    ODV 000044888
  3. Reflected Data Accuracy Code (PDF) of FETI in the Quality Flag (QF) following the each data of ODV spreadsheet
    FETI014789
    ODV 014848

Notes and Problems

•In JODC, we store information such as the observation organizations and observation vessels, etc. along with the observed data but these information will be missing when converting them to ODV spreadsheet. If you would like to use those data, we recommend you to use FETI format.
•In the FETI format, as for the unit for each variable, the unit used for the submitted data from the observations agencies is used as a general rule but in the ODV spreadsheet, we have unified the unit so that data can be used as they are. In addition, the density of pressure depth is converted into "m" for uniformity simply from "44 Unesco Technical Papers in Marine Science (1983)".
•In the FETI format, because navigation and observation numbers were not completely managed, these were created from the data which extracted navigation number and station number to be easy to use it in ODV. We sort out data for every vessel and observation day and number the navigation number for them and if the observation day is vacant for 6 days or more, they are treated as a separate navigation. In addition, the observation spot number is not a station of an original data but the is given on the programme. Therefore, there are cases where the data which should be fundamentally treated as one cruise are divided into plural cruises and vice versa are happened.