摘要
在过去的十几年中，用计算机来模拟复杂表面取得了很大进展。表面模拟技术常被用来内插等值线图，计算土石方等。模拟不规则表面的常用方法有两种，即不规则三角网（TIN）及规则四方形网格（RG）。在建立数字地表模型的过程中，比较困难的问题是如何在这种模型中表达不连续性，如断层，这在矿图中是常见的，在其它用等值线图或立体图表示的地形式面图中也常见到。本文在简单介绍了TIN及RG模型后，对它们的优缺点做了比较，并详细介绍了作者采用的辐射旋转方法的原理，最后还介绍了DTM的应用前景及其发展方向。
:
Over the last ten years, there has been considerable progress in the modelling of complex surface by computer. Surface modelling techniques have often been used to interpolate contours and to calculate land volumes. Two methods are often used in the modelling of irregular surface, i.e. triangulated irregular networks (TIN) and rectangular grids (RG). In the process of establishing digital terrain model (DTM), among all the problems, the more difficult one to be solved is how to represent uncontinuity, such as break layer, which is often existed in mine maps as well as in other topographical con tour or 3-D maps. After a brief review of the TIN and RG models, there advantages and disadvantages are compared in this paper. The principles of the radial sweep method adopted by the authors are discussed in detail. Finally, the application prospect and developing direction of DTM are also discussed.
出处
《测绘学报》
EI
CSCD
北大核心
1993年第2期129-135,共7页
Acta Geodaetica et Cartographica Sinica
基金
国家教委博士点基金
关键词
不规则三角网
辐射旋转
地形线
:Triangulated irregular networks(TIN). Rectangular grids(RG). Unconti-nuity. Radial sweep
