A Study of Three-dimensional Spatial Entity Modeling

In order to really reflect the objective world on which the mankind depends by computers, this article first gives analysis on various kinds of terrain models such as contour line, TIN and RSG by choosing the methods integrating TIN data model with RSG, and smoothing the intersection to make a lifelike reconstruction of real terrain characteristics; secondly it gives analysis on the method of building modeling, ways of data acquisition; and then introduces the integrating method of terrain and building model by using triangle construct algorithms. Finally the author reconstructs the large scale three-dimension entity model of a residential block in Poyang Lake region by using three-dimensional spatial entity modeling method mentioned in this article.