Fachbeiträge

Sämtliche Fachbeiträge aus den Hydrographischen Nachrichten seit der Ausgabe HN 100 sind online verfügbar.
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Comparison of laser bathymetry with single-beam and multibeam data

This article summarises a Master Thesis devoted to the task of evaluating the LIDAR bathymetric systems of Chiroptera and Hawkeye developed by the Swedish company AHAB. The LIDAR bathymetric data was compared against two reference data sets, single-beam and multibeam echo sounder data, which were evaluated beforehand in order to avoid any bias in the comparison. Different comparisons were made over the data to obtain the inner precision, outer accuracies as well as wreck search abilities of the systems under analysis. The reference used for classifying the systems on a specific performance level was the IHO S-44 standard.

LIDAR bathymetry | S-44 standard | DTM comparison | DTM accuracy | Chiroptera | Hawkeye

Ausgabe: HN 101 Seite: 14–17
DOI: 10.23784/HN101-02
Autor/en: Pablo Sánchez Gámez

HydrOs – Ein integriertes Ortungssystem kombiniert mit hydrologischen Daten

Auf Bundeswasserstraßen (BWaStr) werden heute fast ausschließlich Globale Navigationssatellitensysteme (GNSS) für die hochpräzise Ortung von Peilschiffen eingesetzt. In Gebieten unterhalb von Brücken, in extremen Tallagen oder bei starkem Uferbewuchs und ufernahen Gebäuden ist eine Ortung oft nicht möglich bzw. das Ergebnis zu ungenau. Zur Genauigkeitssteigerung, der Erhöhung der Verfügbarkeit und der Zuverlässigkeit bei der Gewinnung von Geometriedaten des Gewässerbetts der BWaStr und zur wirtschaftlicheren Aufgabenerledigung hat die Bundesanstalt für Gewässerkunde (BfG) daher in Kooperation mit dem Institut für Ingenieurgeodäsie der Universität Stuttgart (IIGS) ein integriertes hydrographisches Ortungssystem (HydrOs) entwickelt.

HydrOs | GNSS | Erweitertes Kalman Filter | RTS-Algorithmus | Tachymeter | Ausreißertest

Ausgabe: HN 101 Seite: 6–12
DOI: 10.23784/HN101-01
Autor/en: Harry Wirth, Marc Breitenfeld, Annette Scheider, Volker Schwieger

What exactly is hydrography? – The IHO offers an abstract definition only. It is high time for more graphicness

The term hydrography has different meanings. It describes mainly the science of surveying of waters and of waters-related information, to which the German Hydrographic Society (DHyG) has committed itself to. There are several definitions of the concept depending on the nation and institution. Without doubt, the definition published by the IHO in 2009 has the greatest impact. Still, even this institution hasn’t been able to describe comprehensively and convincingly what hydrography is. Most of all, it lacks a vivid description. Therefore, it is about time to point out the weaknesses of the IHO definition and to present a new one. The following definition at least reflects the German understanding of the concept from the DHyG perspective.

hydrography | definition | terminology | lexicography | concept | philosophy of science

Ausgabe: HN 100 Seite: 59–62
DOI: 10.23784/HN100-13
Autor/en: Lars Schiller

New perspectives on indigenous navigation tradition

Stick charts are a significant part of the Micronesian Marshallese navigation tradition in the Pacific Ocean. The islanders navigated without instruments just by observing, among others, oceanic phenomena such as swells, currents, and roughness characteristics of the sea surface. For a long time, the explanation of the various sticks of such latticework remained secret and something of a mystery and was only obtained by oral transmission under great difficulties. Old and new interpretations of stick charts are compared and presented. Signatures of different swells manifested on stick charts were identified and proved by satellite remote sensing data. Current research on indigenous navigation is growing to conserve such unique tradition in the Pacific and especially in the sea area of the Marshall Islands. For scientific research on indigenous navigation knowledge collaboration between natural scientists and ethnologists is necessary.

Marshall Islands | stick charts | swell diffraction | neutron diffraction | CHRIS satellite image

Ausgabe: HN 100 Seite: 54–58
DOI: 10.23784/HN100-12
Autor/en: Ingo Hennings

The evolution of the Port of Hamburg from a hydrographic perspective

For several hundred years the means of determining the water depth and positioning in the Port of Hamburg have hardly varied. The lead line has played a crucial role for hydrographic measurements. Starting with the introduction of the first echo sounder and the use of satellite navigation the electrotechnics took over the essential part in delivering ever more refined measurement instrumentation for hydrographic surveying. The adoption of computers for data acquisition and processing provides many exciting and seminal prospects. More and more digital products and workflows replace the paper charts opening a new variety of analysis tools that the customers of the Hamburg Port Authority already start to implement.

Hamburg Port | Hamburg Port Authority – HPA | Elbe | Deepenschriewer fleet

Ausgabe: HN 100 Seite: 48–52
DOI: 10.23784/HN100-11
Autor/en: Frank Köster, Thomas Thies

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