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Preliminary acoustic research of diving Arctic birds

Szczucka J.

Hydroacoustics

2008

Vol. 11

365-368

This paper aims to introduce the preliminary results of acoustic studies of the diving strategy of Arctic birds. It presents the inverted echosounding and noise measurements performed by Autonomous Hydroacoustic system (AHS) in Isfjorden (Spitsbergen). Both the echograms and the noise record have been analysed as far as the birds' diving is concerned.

Usage of camera system for determination of pitching and rolling of sounding vessel

Naus K., Makar A.

Reports on Geodesy

2005

z. 2/73

301-307

In this article the description of usage of two cameras for determination of pitching and rolling of sounding vessel has been presented. The description includes presentation of the method of placing and calibration video cameras on the sounding vessel and the method of determination of pitching and rolling on the basis of images obtained using these cameras. The basis of this method is relationship between horizontal line of the image and the horizon line with relation to pitching and rolling.