试用建立数字地形模型与目视判译相结合的方法进行泥石流背景调查

A TEST OF DIGITAL MODEL COMBINED WITH VISUAL INTERPRETATION APPLIED TO THE BACKGROUND INVESTIGATION OF DEBRIS FLOWS

本文以西昌地区泥石流调查为例，介绍了利用解析测图仪直接从航片上采集高程数据，建立数 字高程模型（ＤＥＭ）和提取有关地形属性数据的方法，并结合目视解译与泥石流形成有关的非地 形环境因子，通过计算、自动复合成图和统计运算，获得了大量西昌地区泥石流形成环境的定量、 半定量数据。并通过综合分析，对西昌地区泥石流形成环境有了比较确切的了解，为制定泥石流 治理规划提供了十分有用的资料。

A method investigating the geological background of debris flows along the famous disaster making rivers--the Dong River and the Xi River in Southwest China is briefly introduced in this paper. Based on the elevation data collected from the remote sensing images directly by means of a analytical plotter, a digital terrain model is established first, then followed by visual interpretation quantitatively and semi--quantitatively of a series of factors of geological environment, such as the characteristics of river--system, the drainage geomorphology,.the strata and rocks characters, the vegetation coverage and the disastreous geological phenomena etc.. Some useful conclusions and suggestions are made in this paper.