Current meter data guide
BODC aims to ensure that all data incorporated into our database are adequately documented to allow long term viability and future access. Therefore, key data set information (metadata) are important for each data set we receive.
Our 'General guide to data submission' provides details of
- Data delivery mechanisms.
- Data file format and file naming.
- Parameter descriptions.
- General data set information (basic metadata)
- Where, when and how the data were collected.
- Who was responsible for data collection and how you refer to your data set.
- What has been done to the data.
- Watch points for other users (e.g. problems encountered and comments on data quality).
Information specific to current meter data are described below. Metadata may be supplied in any standard document format (i.e. Microsoft Word or text), included in file headers or by providing a literature reference. Please do not be discouraged from sending us data even if some of the information is unavailable. We fully understand that there are many reasons why the standards specified may not be completely achieved.
Instructions for other data types are also available.
Raw and quality controlled current meter data should, whenever possible, be stored at the original sampling frequency. All parameters measured as part of the series (i.e. temperature, pressure, conductivity) should be included with the data.
Current velocity may be expressed in terms of speed and direction and/or east and north components. Indicate whether the data have been corrected for magnetic variation and provide the assumed magnetic variation.
Metadata specific to current meter data
- The mooring type and mooring reference number.
- The ship/cruise which deployed the mooring.
- A project (if appropriate).
- Date/time of deployment/recovery for each instrument.
- Date/time of the start/end of usable data for each instrument.
- Position and method of position fix (i.e. DGPS, GPS).
- Water column depth (specify method - i.e. sounding and methodology, chart).
- Instrument depth (or height).
- Instrument description, reference number, manufacturer, model, principle of measurement, method of recording — provide a literature reference, web site reference or briefly describe. Include — accuracy, resolution and response range of individual sensors.
- Instrument modifications and their effect on the data.
- Standard of calibration — method, quality, dates and calibration coefficients.
- Brief description or diagram of the mooring structure.
- Performance of the mooring. Include — condition on recovery, whether dragged or damaged. Any event that might affect the data (i.e. effects of near surface buoyancy, fouling, mooring knockdown).
- Sampling scheme of raw data e.g. continuous recording, instantaneous, averaged.
- Interval between samples and the duration of individual samples (raw data).
- Number of raw samples.
- Nominal interval of processed data (excluding gaps resulting from editing).
- Methods of averaging, filtering or compression.
- Gaps in the data record.
- Timing and corrections applied
- De-spiking/smoothing/interpolating methods and editing procedures.
- Data quality report.