北京郊区水土流失信息系统的建立与应用

The establishment and application of the information system on soil and water loss in Beijing

在野外踏勘和室内航片判读的基础上,将影响水土流失的地质、地貌、坡度、土壤、植被、土地利用现状和水土流失程度及强度等因素相同或相近的区域,划分为0.1—2.0平方公里的地块,并绘制成有关图表,获得了近50万个数据。以此为基本数据,建立了微机因子数据库系统和图形文件管理系统,再通过逻辑图建立图形属性与水土流失因子数据间的关系,并进行操作,在微机上实现丁水土流失因子图件的系统管理和分析。在编制门头沟区苇甸沟小流域等重点治理规划中,该系统提供的数据准确、及时,大大提高了工效。

On the basis of field survey and interior interpretation of the areial photograph, the areas with the same or similar factors affecting soil and water loss, including the ones of geology, geography, slope, soil, vegetation, land use state, the level and intensity of soil and water loss,are divided into 0.1 to 2.0km^2 large land mass, drawn into maps and tables, and obtained with 500,000 values, which is taken as the essential data resource to establish data base of the factors for microcomputer and the managing system in pictures and documents.Through logical picture the relationship between picture attribute and the factor value of soil and water loss is founded and operated, therefore the systematic management and analysis on microcomputer is realized.On working out key plan of harness for Weidiangou watershed in Mentougou district, the system provides values accurately and in time.