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Geodesy and Cartography

The Journal of Committee on Geodesy of Polish Academy of Sciences

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Accuracy in fixing ship's positions by camera survey of bearings

Krzysztof Naus
  • Institute of Navigation and Hydrography, Polish Naval Academy, 69 Smidowicza St., 81-103 Gdynia, Poland
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Mariusz Wąż
  • Institute of Navigation and Hydrography, Polish Naval Academy, 69 Smidowicza St., 81-103 Gdynia, Poland
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
Published Online: 2012-06-21 | DOI: https://doi.org/10.2478/v10277-012-0017-6

Accuracy in fixing ship's positions by camera survey of bearings

The paper presents the results of research on the possibilities of fixing ship position coordinates based on results of surveying bearings on navigational marks with the use of the CCD camera. Accuracy of the determination of ship position coordinates, expressed in terms of the mean error, was assumed to be the basic criterion of this estimation.

The first part of the paper describes the method of the determination of the resolution and the mean error of the angle measurement, taken with a camera, and also the method of the determination of the mean error of position coordinates when two or more bearings were measured. There have been defined three software applications assigned for the development of navigational sea charts with accuracy areas mapped on.

The second part contains the results of studying accuracy in fixing ship position coordinates, carried out in the Gulf of Gdansk, with the use of bearings taken obtained with the Rolleiflex and Sony cameras. The results are presented in a form of diagrams of the mean error of angle measurement, also in the form of navigational charts with accuracy fields mapped on.

In the final part, basing on results obtained, the applicability of CCD cameras in automation of coastal navigation performance process is discussed.

Dokładność wyznaczania pozycji statku z pomiarów namiarów wykonanych kamerą

Wartykule przedstawiono opis badań mających na celu ustalenie możliwości określania współrzędnych pozycji statku z wyników pomiarów namiarów optycznych na znaki nawigacyjne wykonanych kamerą CCD. Jako podstawowe kryterium przyjęto dokładność określania współrzędnych pozycji statku zwymiarowaną wartością błędu średniego.

W pierwszej części artykułu przedstawiono metodę wyznaczania rozdzielczości i błędu średniego pomiaru kąta kamerą oraz metodę wyznaczania błędu średniego współrzędnych pozycji z dwóch i więcej namiarów. Opisano trzy aplikacje programowe służące do przygotowywania morskich map nawigacyjnych z naniesionymi obszarami dokładności.

W drugiej części zaprezentowano wyniki z badania dokładności określania współrzędnych pozycji statku na Zatoce Gdańskiej z namiarów zmierzonych kamerą firmy Rolleiflex i Sony. Ukazano je w postaci wykresów błędu średniego pomiaru kąta oraz w postaci morskich map nawigacyjnych z naniesionymi obszarami dokładności.

W części końcowej, opierając się na wynikach badań przeprowadzono dyskusję dotyczącą oceny przydatności kamer CCD do automatyzacji procesu prowadzenia morskiej nawigacji przybrzeżnej.

Keywords: coastal navigation; position accuracy; camera survey of an angle

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About the article


Published Online: 2012-06-21

Published in Print: 2011-01-01


Citation Information: Geodesy and Cartography, ISSN (Print) 2080-6736, DOI: https://doi.org/10.2478/v10277-012-0017-6.

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