北京市水土流失信息系统的研究

<正> 水土流失信息系统是地理信息系统技术在水土流失评价和水土流失信息管理上的应用。利用1:1.8万黑白航片和1:1万及1:1.5万地形图,参照已有各类调查资料,进行室内判读、实况验证,以5～30km~2的闭合小流域为独立图幅单位,在各小流域内将影响水土流失的各因子相同或相似的多边形区域,划分为空间分布的0.1～2.0km~2的水土流失景观单元,形成地学编码图。以地学编码图为基础,建立具有空间图形和属性因子的水土流失信息系统。

Study on soil erosion information system for Beijing region

The soil erosion information system is an application of geography information system technique in evaluation and information management of soil erosion.This paper presents a brief account of soil erosion information system of Beijing region and its general design. The application of such system in practice is summarized as follow information manage ment of soil erosion,estimation and statistics of soil erosion indexes,statistic analysis of erosion regularity and two methods of soil erosion evaluation:muddle evaluation method and expert evaluation method.