The accuracy of nautical charts is highly dependent upon accurate surveys being carried out, and as the sea bed is often soft sand or mud that moves with time, these need to be repeated periodically. Unfortunately hydrographic offices are generally tasked to concentrate on the main routes for large commercial shipping, and have limited budgets, which mean that many coastal areas that are frequented by leisure and small commercial craft are inadequately surveyed. This results in a greater likelihood of damage to vessels, injuries and pollution due to vessels going aground. The lack of up-to-date survey data also impacts other areas, such as the monitoring of silting or movements of the sea bed and the availability of data for engineering projects, such as outfalls, or offshore tidal or wind energy schemes. Although surveys can be specially commissioned for engineering activities such as these, this is a very expensive process, and the costs are often hard to justify, especially early on in the project when multiple possible sites may be being examined.
CoSuDEC brings together a number of developments to overcome the paucity of data and the high costs of commissioning custom surveys. First, with the enhancements to GPS accuracy, especially when augmented with the use of EGNOS, positional accuracy of a general navigation GPS is adequate for IHO (International Hydrographic Organisation) Level 1 surveys for harbours and coastal areas. Secondly, crowd sourcing can be used by getting the many leisure and workboats in an area to log data that can be then collated and processed. By combining data from a large number of vessels, it can be treated statistically to remove any rogue readings, and generally to enhance the accuracy of the depth readings, so again Level 1 standards can be achieved. This will allow cost-effective gathering of data that can then be processed to provide input to downstream users such as chart publishers or GIS users, as well as being made available to the data loggers themselves to recompense them for their efforts.
The technical results of the project will be:
- a prototype software system for processing logged data, from raw data through to processed input to charts;
- a system for recruiting and managing the volunteers for the crowd sourcing;
- both software and hardware data loggers for use on the vessels.
In addition, a large knowledge base will be built up on the necessary techniques.
On the non-technical side, a market presence will be in place for recruiting loggers and disseminating the results within the trial countries. This will make it easy to switch from trials and prototyping to a commercial service.
Amber Route UAB