Cleaning of hydrographic data for determination of the waterways’ seabed
-
Artur Makar [1]
-
[1] Institute of Navigation
Institute of Navigation
Estados Unidos
-
- Localización: Maritime Transport'16 / coord. por Francisco Javier Martínez de Osés, Marcella Castells Sanabra, 2016, ISBN 978-84-9880-591-8, págs. 213-219
- Idioma: inglés
- Enlaces
-
Resumen
Multibeam echosouner MBES is a hi-tech hydroacoustic device which enables acquisition of enormous amount of spatial data during hydrographic surveys. Variable sound speed in water influences the inflection of the acoustic rays transmitted by the multibeam transducer. Beams are diagonally skewed from the plumb line and cause significant errors in depth measurement process as well as in determination of reflection points on the seabed. The edges of the surveyed belt carry the highest risk of errors. Therefore for a flat seabed surface the radiation sector for a beam equals 60-70 degrees. With each profile line the surveyed areas overlap. Cleaning of data is one of the stages of the analysis of sea survey results conducted with a multibeam echosounder. Its main purpose is to erase major errors and initially smoothen the produced surface. Available methods allow manual, semi-automatic and automatic clarification of data. The article introduces the issues of bathymetric data cleansing in order to minimize potential errors in sea surface delineation, especially of waterway.
