Linear features on side-scan sonar images: an algorithm for the correction of angular distortion

Voulgaris, G. and Collins, M.B. (1991) Linear features on side-scan sonar images: an algorithm for the correction of angular distortion. Marine Geology, 96 (1-2), 187-190. (doi:10.1016/0025-3227(91)90216-Q).

Record type: Article

Abstract

The distortion ellipse graphical method is used regularly by scientists for the correction of compressional effects caused in side-scan sonar images by variable ship speeds. An algorithm is derived for this correction for the calculation of the true angle of linear objects (e.g. sandwaves) in relation to the ship's track:
where R is the ratio of the ship's speed to the optimal ship speed (i.e. for no distortion) and ? is the false angle between the ship's track and the linear object measured directly from the image (sonograph) (0° < ? < 90°). The algorithm is applicable for any combination of chart paper speed and width. The results obtained using this approach are considered to be more accurate than conventional graphical methods of analysis of analogue output. Interpretation of imagery for sedimentological investigations should be enhanced by the adoption of this procedure.

This record has no associated files available for download.