GIS应用中水体三维建模研究

Study of Water Three-dimensional Modeling in GIS Applications

根据应用需求的不同,水体的三维建模也有不同的要求。当单独作为景观需求时,水体只需抽象成一个面覆盖在地表上;当把水层因素的变化作为需求时,水体就必须抽象成一个占据三维空间的体;当把风力的变化作为需求时,水体就必须抽象成一个上表面起伏变化的体。每一种需求在建模时都有自己的优点和缺点、易处和难处。在实际应用用中,有时不只是一种需求,而是多种需求的组合。水体本身没有固定的形状,随地表高低起伏而变化,从而更加大了水体建模的难度。本文主要研究了每一种需求的解决方案,以为将来的应用需求提供指导性的建议。

There are different requirements on three-dimensional modeling of the water bodies depending on different application requirements. When it is only used as landscape, the water body just should be abstracted as a surface covering on the earth surface. When the change of the water layer factors is treated as demand, the water body must be abstracted into a body occupying three-dimensional space. When the wind power change is treated as a demand, the water body must be abstracted into a body with surface of the ups and downs. Each demand has its own advantages and disadvantages as well as simplicity and difficulties during modeling. It is sometimes not just a demand, but the combination of a variety of needs in practical applications. Water body itself has no fixed shape and is changed with the ups and downs of earth surface, thus increasing water modeling difficulty. This paper mainly studies the solution of each demand, thereby providing guidance recommendations for future application needs.