Equipment Suppliers

Some of the sensors on the Bramble Pile, the associated datalogger, and the software applications used to relay the data ashore, were supplied and installed by Campbell Scientific Limited.

The anemometer was supplied by Gill Instruments of Lymington.

The Visibility sensor was supplied by Biral of Bristol.

The radio-modems used for the radio links between the Bramble Pile and VTS, Southampton, were provided by Wood and Douglas Limited, a Solent-based supplier of communications equipment.

Emworx Limited on Hayling Island, have given advice on system design, built the web site and supplied hosting facilities.

Chimet Support Group is responsible for the design and development of the overall system, its project management, and the development of the software used for data control and presentation.

Sensors and Data Reporting

The web site is updated every minute from the data collection site at the Bramble Bank and then by radio link to the VTS building at Dockhead, Eastern Docks, Southampton. Every 5 minutes the sensors data is transferred from the Hydrographer of ABP Southampton to the CSG control computer at the RNLI Station, Hayling Island. The latest sensor data is then processed to create all the reports, graphics and archives. These outputs are then transferred to the website.

The link to tidal predictions (in the Latest Report page) is from the United Kingdom Hydrographic Office.

Position coordinates (latitude and longitude) are referred to WGS84 chart datum.

Tidal heights are reduced to Chart Datum, which is approximately the level of Least Astronomical Tide.

The following table shows briefly how the reported data is derived.

Measurement Sensor Sampling Frequency Averaging Reporting Interval
Wind Speed Solid State Anemometer Every second 5 minutes Every 5 minutes
Wind Gust Solid State Anemometer Every second Taking max of 3-second running average Every 5 minutes
Wind Direction Solid State Anemometer Every second Vector addition over
5 minutes
Every 5 minutes
Air Temperature Thermistor Every second 5 minutes Every 5 minutes
Sea Temperature Thermistor Every second 5 minutes Every 5 minutes
Barometric Pressure Barometric
Pressure Transducer
5 minutes Every 5 minutes
Visibility Ultrasonic Particle Dispersion Every 5 minutes