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.
1. latitude: real, in decimal degrees. Negative values represent
2. longitude: real, in decimal degrees. Negative values represent
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 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
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
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
Sample data file:
PROCESSING AT CDIP
Data files can be transferred directly to CDIP's servers using
ftp. (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 incoming files
and process them automatically.