Terrain-generating technology based on combination of multiple interpolation methods

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.