摘要
本次土壤侵蚀自动评价采用TM卫星影像,通过人机交互目视解译获取土地利用信息,应用数字高程模型(DEM)生成坡度图,从TM影像提取NDVI,利用像元二分模型得到植被覆盖度,运用GIS强大的空间分析功能,建立土壤侵蚀强度评判模型,自动评价生成开县的土壤侵蚀强度分级图。对评价的结果进行了分析,结果符合开县的土壤侵蚀实际情况,研究表明土壤侵蚀自动评价方法可行。
In the auto-assessing of soil erosion, TM remote sensing images are basic information and the land use map can be gained by man-machine interactive visual interpretation method. The slope ranking map is derived from DEM and normalized deference vegetation index （NDVI） is extracted from TM images, then the vegetation fraction can be estimated from NDVI through the dimidiate pixel model. After establishing the judgment model of soil erosion intensity, the model auto-generates the soil erosion in Kaixian with the powerful function of spatial analysis of geographic information system. It provides the analysis of the soil erosion intensity data, which suits the actual situation in Kaixian, so the method of auto-assessing is appropriate.
出处
《水土保持研究》
CSCD
北大核心
2007年第3期109-111,共3页
Research of Soil and Water Conservation
基金
国家重点基础研究发展计划项目(2003CB415202
2006CB403203)资助
