资源信息系统中数字地形模型子系统的建立

数字地形模型(DTM)是资源信息系统中的重要组成部分。以格网方式建立的地形模型具有定位及定量化的优点,用途很广。本文详细介绍了DTM中数据采集、坡度和坡向数据的计算、格网的加密、地形模型的建立和三维立体绘图的原理和方法。并对在微机环境下建立的DTM的功能做了系统介绍。由本系统建立的数字地形模型可广泛用于遥感图像处理、植被分类、立地条件划分、坡度和坡向图制作,也可用于林区道路选线、土石方计算、水库选址和坝高与库容计算及洪水危害估计等方面。

ESTABLISHMENT OF DIGITAL TERRAIN MODEL SUBSYSTEM IN RESOURCE INFORMATION SYSTEM

Digital terrain model (DTM) is an important component of a resource information system. The DTM with netted texture has the advantage of fixed position and altitude. It has many uses. This paper described in detail the principle and method of altitude data extraction, slope and aspect data calculation, change of net density, establishment of terrain model and three dimension map-making. The function of the DTM subsystem under microcomputer environment was also introduced. The DTM established within this subsystem can be used in image processing of remote sensing, classification of vegatation, stratification of site condition, map-making of slope and aspect. It can also be used in selecting road, quantity calculation of earthwork, selecting location of reservoir, calculation of dam height and capacity of reservoir, disaster estimation of floodwater and so on.