Metadata Report for BODC Series Reference Number 1030202

• Metadata Summary

• Problem Reports

• Data Access Policy

• Narrative Documents

• Project Information

• Data Activity or Cruise Information

• Fixed Station Information

• BODC Quality Flags

• SeaDataNet Quality Flags

Metadata Summary

Problem Reports

No Problem Report Found in the Database

SIMORC Total Indonesia Tide Gauge Data Narrative

Narrative

RBR Ltd TGR1050 tide gauges were deployed on the Sisi and Tunu 1,2 and 3 moorings, Indonesia. No data was recovered from the tide gauge at Tunu 3, so the pressure data from an Aquadopp current meter was substituted.

Data Quality Information

The tide data from the Sisi tide gauge shows a datum shift on 25th September 2008 at approximately 17:30. It is possible that the mooring slipped.

Data Access Policy

SIMORC data access conditions

The data collated and held at BODC on behalf of the SIMORC project are restricted. However, the data will be available to download from the Official SIMORC Website, as part of the project protocol. The data set will initially include data from the oil companies TOTAL, Shell and BP.

Narrative Documents

RBR Tide Recorder TGR 1050 series

The TGR 1050 is a self-contained depth logger that uses a pressure transducer to monitor tide action. Tidal measurements are achieved by averaging pressure data at a sample of 4 Hz, while using a built-in function to eliminate interference from wave action. The TGR-1050P is designed for measurements at depth, while the TGR-1050HT is a surface recorder.

Specifications

Further details can be found in the manufacturer's specification sheet.

Originator's Data Processing

Data processing

Tide gauge data were exported from RBR Ltd software, for the following processing:

• The record was truncated to exclude times pre and post deployment.
• Time was recorded in GMT.
• Checks were run for outliers in the height data. An automated check compared the median of 3 values with the centre point, allowing a tolerance of 30cm. Outliers were visually examined and flagged.
• Checks were then run for constant values for 3 or more consecutive datacycles.
• All flagged data were replaced with the Matlab NaN symbol, excluding them from further processing.
• No tide data was recovered from the RBR Ltd TGR1050 tide gauge at the Tunu 3 location. The pressure signal from the Nortek Aquadopp current meter was used instead.

BODC Processing

Data were received by BODC in CSV files. They were then reformatted to QXF format using BODC transfer function 422. The following table shows how the variables within the files were mapped to the appropriate BODC parameter codes:

Following transfer to QXF, the data were screened using BODC's in-house visualisation software, EDSERPLO.

General Data Screening carried out by BODC

BODC screen both the series header qualifying information and the parameter values in the data cycles themselves.

Header information is inspected for:

• Irregularities such as unfeasible values
• Inconsistencies between related information, for example:
  • Times for instrument deployment and for start/end of data series
  • Length of record and the number of data cycles/cycle interval
  • Parameters expected and the parameters actually present in the data cycles
• Originator's comments on meter/mooring performance and data quality

Documents are written by BODC highlighting irregularities which cannot be resolved.

Data cycles are inspected using time or depth series plots of all parameters. Currents are additionally inspected using vector scatter plots and time series plots of North and East velocity components. These presentations undergo intrinsic and extrinsic screening to detect infeasible values within the data cycles themselves and inconsistencies as seen when comparing characteristics of adjacent data sets displaced with respect to depth, position or time. Values suspected of being of non-oceanographic origin may be tagged with the BODC flag denoting suspect value; the data values will not be altered.

The following types of irregularity, each relying on visual detection in the plot, are amongst those which may be flagged as suspect:

• Spurious data at the start or end of the record.
• Obvious spikes occurring in periods free from meteorological disturbance.
• A sequence of constant values in consecutive data cycles.

If a large percentage of the data is affected by irregularities then a Problem Report will be written rather than flagging the individual suspect values. Problem Reports are also used to highlight irregularities seen in the graphical data presentations.

Inconsistencies between the characteristics of the data set and those of its neighbours are sought and, where necessary, documented. This covers inconsistencies such as the following:

• Maximum and minimum values of parameters (spikes excluded).
• The occurrence of meteorological events.

This intrinsic and extrinsic screening of the parameter values seeks to confirm the qualifying information and the source laboratory's comments on the series. In screening and collating information, every care is taken to ensure that errors of BODC making are not introduced.

Project Information

System of Industry Metocean data for the Offshore and Research Communities (SIMORC)

The EU-funded SIMORC project is a collaborative effort between MARIS (Netherlands), BODC (UK), the International Association of Oil and Gas Producers (OGP) and IOC-IODE to provide a harmonised and quality controlled metocean data set from data collected by oil and gas producers, accessible through the SIMORC protocol.

Data Activity or Cruise Information

Data Activity

SIMORC Mooring Indonesia Tunu 1

The position of the mooring was 0.66197° S; 117.5313° E at a depth of 11 metres.

The mooring was deployed on behalf of TOTAL at Tunu 1, Indonesia and consisted of the following instruments.

This mooring was terminated early on 24th January 2008 due to battery problems.

Related Data Activity activities are detailed in Appendix 1

Cruise

Complete Cruise Metadata Report is available here

Fixed Station Information

Fixed Station Information

SIMORC: TOTAL Indonesia Tunu 1 Fixed Station Document

This site is offshore of the Mahakam Delta, north of Balikpapan in the Makassar Strait. A mooring was deployed at this site.

The nominal position of this site is 0.66197° S; 117.5313° E with an approximate water depth of 10 metres.

Related Fixed Station activities are detailed in Appendix 2

BODC Quality Control Flags

The following single character qualifying flags may be associated with one or more individual parameters with a data cycle:

SeaDataNet Quality Control Flags

The following single character qualifying flags may be associated with one or more individual parameters with a data cycle:

Appendix 1: Tunu 1

Related series for this Data Activity are presented in the table below. Further information can be found by following the appropriate links.

If you are interested in these series, please be aware we offer a multiple file download service. Should your credentials be insufficient for automatic download, the service also offers a referral to our Enquiries Officer who may be able to negotiate access.

Appendix 2: Indonesia Tunu 1

Related series for this Fixed Station are presented in the table below. Further information can be found by following the appropriate links.

If you are interested in these series, please be aware we offer a multiple file download service. Should your credentials be insufficient for automatic download, the service also offers a referral to our Enquiries Officer who may be able to negotiate access.