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Dynamic bathymetric ENCs in ports: SevenCs, Hamburg, Germany
Pillich, B.; Moggert, F. (2006). Dynamic bathymetric ENCs in ports: SevenCs, Hamburg, Germany, in: Evolutions in hydrography, 6th - 9th November 2006, Provincial House Antwerp, Belgium: Proceedings of the 15th International Congress of the International Federation of Hydrographic Societies. Special Publication (Hydrographic Society), 55: pp. 34-42
In: (2006). Evolutions in hydrography, 6th - 9th November 2006, Provincial House Antwerp, Belgium: Proceedings of the 15th International Congress of the International Federation of Hydrographic Societies. Special Publication of the Hydrographic Society, 55. International Federation of Hydrographic Society: London. 234 + cd-rom pp., more
In: Special Publication (Hydrographic Society). Hydrographic Society: London. ISSN 0309-8303, more

Available in Authors 
Document type: Conference paper

Keywords
    Bathymetric charts; Harbours; Hydrography

Authors  Top 
  • Pillich, B.
  • Moggert, F.

Abstract
    Most of the present day Electronic Navigational Charts (ENCs) are produced by digitising paper charts. This methodology leads to a considerable loss of detail of the bottom topography when compared with the source survey data. In addition, the delays in the chain of procedures leading from survey to a chart displayed onboard a vessel can be serious as well. This is particularly important in the areas where the bathymetry is likely to be changeable, either due to natural processes like storms or travelling sand waves, or to human activities, e.g. dredging. Ports and their approaches are the prime example of the latter. The new bathymetric data are often available on a much shorter notice than the standard ENCs are produced or updated. These high density data can be sent out by the port authorities and incorporated in the ENCs carried by the vessels by interleaving them with the other ENC data. The onboard software can then produce the required contour lines. Tests results indicate that this process is fast and can be carried out with minimal effort. It does not involve any changes in topography or in other existing chart information, only in bathymetry. The product has been thus given the name of “bathymetric ENCs”. The availability of the bathymetric ENCs in the port environment applications will increase safety of navigation and the efficiency of the handling of vessel traffic and of the general management of port operations. In addition, depth data, including bathymetric ENCs, can be dynamically presented and adjusted for tides and surges using either predictions, modelling or observational data supplied by in-situ transmitters. The creation of dynamic charts which include bathymetric ENCs thus permitting real-time display of the most up-todate depth data will enhance further the safety value of ECDIS. At present, regulatory restrictions preclude application of dynamic depths for the use in the official ECDIS, but these are expected to be lifted in the near future. These restrictions do not apply to the Portable Pilot Units or to other non-navigational applications, like port management information systems. Such systems can be based on the web and provide also the general public with access to this important information.

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