基于GIS平台的农业非点源污染研究

开发了一种运算法自动生成AGNPS模型所需要的大部分资料，并把模拟结果转换成GIS文件格式，利用遥感软件和开发的程序，从3个来源生成AGNPS模型需要的数据，包括来自于地形地貌图的数字化文件，土壤调查图集的数字化土壤分类图和地球资源卫星TM图像的植被覆盖分类图件；一旦生成了需要的GIS文件，格式转换软件能把GIS文件转换为AGNPS要求的表格文件格式；最后把AGNPS所有输出结果转换成GIS文件格式，以便用于进一步工作分析。

Research on Agricultural Nonpoint Sources Pollution Based on GIS

A study on agricultural nonpoint source (AGNPS) pollution in Mianyang Guansihe watershed is conducted. The authors have developed a methodology to automatically produce a majority of input data required by an AGNPS model, and to display either all or selected AGNPS output data in GIS files. The specific steps are as follows: (1) data generating: using the remote sensing image processing system and some programs developed by the authors, the data required by the AGNPS model are generated from three sources, including the digital file with contour lines from topographic maps, the digital soil mapping units from soil surveys, and the land cover from landsat TM image classification; (2) data input: once the requires GIS files are generated, a computer program converts the GIS files into the tabular file format requires by AGNPS; (3) model output: all AGNPS output data are converted into GIS files, so that they can be used for further analyses.