SUBMITTING SPECTRAL DATA TO CDIP

Submitting spectral data to CDIP requires two things: a definition

of the sensor producing the data, and the data itself. First

provide the following information about the sensor to CDIP. This

information must be kept current at all times. For instance, if a

sensor is redeployed and any of the description fields changes -

perhaps the location or the depth - please notify CDIP immediately.

In both the sensor definition and data, provide the values with as

much resolution as possible. All times should be UTC.

Sensor Definition

1. latitude: real, in decimal degrees. Negative values represent

      south latitudes

2. longitude: real, in decimal degrees. Negative values represent

      west longitudes

3. MLLW water depth: integer, in cm

4. sensor elevation: integer, in cm. Does not apply to buoys. For

      both underwater and above-water sensors, elevation from sea floor.

5. installation date: string, 'YYYYMMDDhh', in UTC. Note that the frame opens

     at the very beginning of the given hour - if set to 2002122308, the

     frame is open from 2002-12-23 08:00:00

6. removal date: string, 'YYYYMMDDhh', in UTC. Note that the frame closes

     at the very end of the given hour - if set to 2002122308, the

     frame closes at 2002-12-23 08:59:59. To denote an unknown

     date in the future (for the removal date of a sensor currently

     in use), the date 2100010100 should be used.

7. sample rate: real, in Hz

8. gauge type: indexed integer, chosen from the following list. You

     may recommend a 32-character descriptor for your sensor if it

     is not already listed below.

     1.  'Paros pressure sensor           '

     2.  'Sensotec pressure sensor        '

     3.  'Kulite pressure sensor          '

     4.  'Gulton pressure sensor          '

     5.  'Datawell Mark 1 directional buoy'

     6.  'Datawell Mark 2 directional buoy'

     7.  'Datawell non-directional buoy   '

     8.  'Wavecrest non-directional buoy  '

     9.  'RM Young anemometer             '

     10. 'Qualmetrics anemometer          '

     11. 'Skyvane anemometer              '

     12. 'Minco resis temp detector (RTD) '

     13. 'Paros temperature sensor        '

     14. 'KVH digital compass             '

     15. 'Marsh-McBirney current meter    '

     16. 'Paros digital pressure sensor   '

     17. 'RM Young temperature sensor     '

     18. 'RDI ADCP                        '

 

9. serial number: string, maximum 10 chars

10. identifier: string, the identification string used by the submitting

      institution for the sensor in their data and products.

Data Format

Data submitted to CDIP must contain a one-line header along with

the spectral parameters. The format of the header and data are

decribed below. Any value which is not applicable, not calculated

(because of low energy),  or unknown should be set to -9999.9.

Header, 1 line with 4 fields, comma-delimited:

Sensor ID, Start time, Sample length, Sensor depth

Sensor ID     - Assigned by CDIP once the sensor definition has been

                received

Start time    - String, UTC time, 14 chars: YYYYMMDDhhmmss

Sample length - Length in seconds of sample used in spectral calculations

Sensor depth  - The depth (cm) as calculated from the time series obtained

                  from the sensor (i.e. the series mean), if applicable.

                  Not tide corrected.

Data, 1 line per spectral band, 9 fields per line, comma-delimited:

Frequency,Band width,Energy density,Direction,a1,b1,a2,b2,Check factor

Frequency      - the midpoint of each band, in hertz (Hz)

Band width     - width (in hertz) of the band over which the energy is

                   calculated

Energy density - wave energy density, in m*m/Hz

Direction      - mean wave direction within each band, in degrees clockwise

                   from true north

a1,b1,a2,b2    - normalized coefficients of the directional Fourier series

Check factor   - as calculated by Datawell (approximately 1 for waves in

                   deep water)

Sample data file:

07308,20041207185300,2048,-9999.9

0.0250,0.0050,0.0010,99,-0.0375,0.2426,0.1430,-0.3870,-9999.9

0.0300,0.0050,0.0008,289,0.1424,-0.4226,-0.2332,-0.2902,-9999.9

0.0350,0.0050,0.0008,92,-0.0062,0.2016,-0.2443,-0.2928,-9999.9

0.0400,0.0050,0.0016,313,0.0188,-0.0204,-0.4614,0.0830,-9999.9

0.0450,0.0050,0.0032,161,-0.2065,0.0725,-0.5546,-0.0739,-9999.9

Processing at CDIP

Data can placed directly into the /project/farallon/ss_data

directory on CDIP's servers. (Contact CDIP for data transmission

details.) The files should be given a 19-char filename with

the following format: ssSTNIDYYYYMMDDHHMM, using the station id

and the UTC time.

CDIP's realtime processing will pick up files from the ss_data dir

and process them automatically.