基于多种空间插值方法融合的地形生成技术研究

Terrain-generating technology based on combination of multiple interpolation methods

在GIS应用研究方面,空间插值是将矢量数据转换成栅格数据的一种基本方法,其中距离倒数插值和线性拟合插值等方法被广泛采用。距离倒数插值从整体上保证了插值结果的准确度,但在局部地形突变的区域误差较大。基于最小二乘思想的线性拟合方法能弥补这一不足。将这两种方法融合,对真实地形的等高线矢量模型进行插值计算,得到栅格化的数字高程模型,即对真实地形的可视化模拟。还利用了DirectX图形渲染技术对地形进行纹理贴图和光照处理,实现了现实三维地形的可视化仿真。

In the study on application of Geography Information System （GIS）, spatial interpolation is a basic method for converting vector data model into grid data model, of which inverse distance interpolation and linear interpolation are widely used. Inverse distance interpolation can produce a totally precise result, but in area such as valley or peak of a mountain, it will induce considerable error. Linear interpolation based on the least square method can compensate for that. We combined the two methods together for interpolation calculation of the contour vector model of the actual terrain, and obtained the grid - type digital elevation model. Then, we used DirectX rendering engine for image processing and illumination processing, therefore a visual simulation for a three-dimensional terrain is realized.