航海視環境の背景条件特性

概要

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Safe navigation requires "situation awareness", "proper look-out", and "decision making" with a margin of time and distance to targets such as other ships, fishing nets, aids for navigation, and so on. This study focuses on the stage of "situation awareness". For humans, generally, visual sight is the main means of getting information. Also for ship's navigator, "visual environment at sea" is an important source of information. If they can't make a distinction between the background and the target in visual environment, even though the target is within visibility range, they might miss it. "Improper look-out," which is the main cause of marine disaster, might occur. This study shows the characteristics of background condition of the visual environment at sea by measuring the "spectral radiance," i.e., power of light per wavelength, hardly ever measured at sea. With the results, authors considered the measures for making visibility better and reducing marine disaster.
2010-09-25