Research On Visualization Of Ocean-current, Ocean-tide And Ocean-waves

The ocean is a fundamental part of the global life support system, and it covered70%of the earth’s surface, so you will not be able to establish a real system of "DigitalEarth" if you can’t establish a digital ocean subsystem, and the value of "Digital Earth"will be reduced greatly. Visualization of ocean hydrological data is one of the mainfunctions of the digital ocean subsystem, and it is helpful for analysis and control themarine law.In this paper, the main work is the visualization of ocean current data, tide data andocean waves. For the ocean current data visualization, the main work is homogenizationprocessing technology for the messy sampling point, which used to eliminate theadverse effects on the visual effect of visualization. For tide data visualization, the paperused numerical calculation to obtain the tide data for each sampling point within aregion, which solved the problem that tide data limited to tide station and cannot coverthe whole area. For the ocean waves simulation, this paper achieved a simulation ofglobal sea surface in the three-dimensional sphere, and used line texture mappingtechnology to obtain the texture of the sea surface which solved the problem of textureseams. The main work and contributions of the paper are as follows:1) For the problem that the scattered distribution of the sampling points of theoriginal ocean current data would make adverse affect the visual effect, thepaper divided the data area into regular quadrilateral grid, then the oceancurrent data of each point of the quadrilateral mesh was interpolated accordingto the original data and obtained the batter visual effect by using vectorarrows.2) For the problem that the tide data obtained from tide gauge stations can notcovered the entire data area, the paper studied and analyzed a variety of tidalnumerical calculation models, and finally obtained the tide data for eachsampling point within a region by using harmonic analysis method, so as torealized the tide data visualization of the whole area.3) To avoid the texture seams appeared in the texture mapping, in the calculationof the sea light, the paper used the liner texture mapping technology to obtainthe color of each grid point which used as sea surface texture. Finally, thepaper achieved the simulation of the global ocean waves in thethree-dimensional sphere by using geometric model-based method.