3D HYDROGRAPHIC DATA PRESENTED BY MEANS OF THE CHROMO STEREOSCOPIC TECHNIQUE

摘要

Practically unchanged for several hundreds of years, hydrographic and nautical information has been presented on a two dimensional (2D) paper chart. With the advances in computer and information technology, new techniques of presenting spatial data have emerged. Electronic charts have revolutionised navigation and the collection of digital hydrographic data is increasingly efficient. Computerised three dimensional (3D) visualisation techniques are now developed in several fields, from computer gaming to advanced scientific visualisation. The visualisation of hydrographic data might employ such techniques to the increasingly detailed and complex hydrographic datasets in order to improve the perception and comprehension of the data. 3D effects and depth perception in a display system can be achieved in a number of different ways, which was discussed in Ostnes. The simplest method is to apply one or more monocular depth cues, but to establish stereoscopic effects, and further enhance depth perception; a binocular depth cue has to be applied. The left and right eye images of a stereo pair have to be channelled to the respective eyes with the exception of the chromo stereoscopic technique which only needs one colour-coded image and simple low cost goggles to establish the stereoscopic effect. This paper will present the chromo stereoscopic technique and how it might be applied to hydrographic datasets through a simple application. Concluding that with relatively simple means, the chromo stereoscopic technique can be implemented in the software tools presently available and used to improve hydrographic data visualisations.