应用GIS实现水土流失定量遥感监测

The Quantitative Remote Sensing Monitoring of Soil and Water Loss by Using GIS

首次报道了福建省南安市1991年以来应用RS和GIS技术，建立了以像元（30m×30m）为基础的空间数据模型，针对土壤流失量的定量遥感监测问题，完成了1988年和1996年的水土流失定量遥感监测。结果表明：全市水土流失面积减少20．63％，水土流失量下降了35.7％，河区悬移质输沙量减少了54．7％。同时也指出了水土流失的一些新变化，并对本方法的优缺点作了简单的评述。

The application of RS nd GIS techniques of Na'an city in Fujian province since 1991is reported first, the spatial data model on the basis of pixel (3Om × 3Om) were established.The quantitative remote senisng monitoring of soil and water loss in 1988 and 1996 has beencompleted aimed at the problem on the quantitative remote sensing of soil erosion amount. Theresults showed that, in the areas with soil and water loss, soil and water loss amount and sus-pended load in rivers of whole city were decreased respectively as follows:20. 63%, 35. 7%and54. 7%. Meanwhile, some new changes of soil and water loss are pointed out, the merits anddemerits of the method are evaluated briefly.