基于水下景观原理的城市空间可视化

为了解决直接根据空间坐标对地上、地下物体建模易导致视觉混乱的问题，基于水下景观原理对城市地上和地下物体进行了三维建模．根据观察水下景观的原理，当视点位于地上时，利用OpenGL的颜色混合功能给地表赋予适当的颜色，使地下物体表面具有地表颜色的成分，通过颜色与地上物体相区别．当深度大、地下物体多时，还可以利用0penGL的雾化功能，使地下物体的深度信息通过其颜色的明暗程度来体现．最后，利用某城市小区的数据验证了该方法的可行性．

Urban Spatial Visualization Based on Principle of Sub-water Sight

Based on the principle of sub-water sight, the 3D model of urban overground and underground objects was set up in order to solve the problem of visual confusion resulted from modeling directly from their 3D coordinates. According to the principle, when the vision point is located on the ground, a proper color can be given to the earth's surface by using the color blend function of OpenGL, and underground objects are made to have the color ingredient of the earth's surface to distinguish overground and underground objects from their colors. On the condition of great underground depth and more underground objects, information on their depth can be shown by the shading degree of their colors by means of the fog operation function of OpenGL. At last, the feasibility of this method was proved using data on an urban district.