| Soil erosion is one of the ecological environment problems in the earth. The continuance of Soil erosion will result in not only the descent of soil quality, but also silt of rivers & lakes, and flood disaster as well. Yunnan province is located in one of the five water erosion areas in China-YunGui Plateau water erosion. The water erosion is the main soil erosion. In the recent years, in the process of the exploitation of west region, the human activities are frequent. The trend of soil erosion will be worsen. Therefore, it is the urgent need of land exploiture and environment repair that how to investigate the current situation of soil losses accurately, quickly and dynamically, how to predict & inspect soil losses, and provide scientific base for the repair of soil erosion and implement of soil and water conservation planning..Otherwise, the survey method of soil losses is lagger in yunnan.The investigation method of soil losses status includes methods of conventional survey and qualitative remote sensing (that is Visual Interpretation Method on Image or Image Processing on Remote Sensing ). According to the ministry published standard, these two methods can obtain investigate or surveillance map and relevant statistic data. However, the error (mistake) results from erosion level human generated. In addition, it takes time and uses great efforts. These two methods can not meet the need of dynamic survey on soil losses distribution temporally and spatially in soil and water conservation very well.In the recent years, the rapid development of 3S technique integration provides a new tool for investigation said surveillance on soil erosion. Quantitative remote sensing method on soil losses can be realized with GIS, RS and GPS integration on personal compute. It has the merits of accuracy, speediness, dynamic, quantity and orientation. And it becomes one of the new methods recommended by internal and external experts. By using this technique, it will change the lag and localization of regular earth investigation method on soil losses in Yunnan province, integrate soil losses survey & water and soil conservation, and help to establish the next year's control measures besides to finish surveillance on soil erosion. So as to accomplish the dynamic surveillance task of "annual check, and the publish in three years ".This study uses quantitative remote sensing method on soil losses which based on 3S technique and supported by GIS software to probe into the application of quantitative remote sensing method on soil losses. And according as the equations of soil losses (A=fkrslcp) & predicting soil conservation intensity (Y=cp-cp') to realize the 3S technique integration on GIS platform in study area of Longchuan river drainage basin. In the first place, the study processed data of remote sensing and non-remote sensing to be digital, vector, raster and imagery geocode, established geographic database of soil erosion, and calculated elements' pixel maps of soilerosion. Secondly, by using Model Builder of Arcview to establish dynamic survey model of soil losses in Longchuan river drainage basin. At last, to obtain maps of status & the forecast maps for soil conservation. Finishing quantitative remote sensing task on soil losses of 1998 and 1999 in study area. Through running the pixel statistical program, we can obtain the results of soil erosion in the drainage basin- the total amount of soil losses of the experimental region were: 4.84 million tons in 1998 and 8.69 million tons in 1999 respectively. We also can obtain the results of control areas of soil losses in study area according to soil conservation intensity prediction model: the areas need to administrate was 317.77 km2 and in dire need of administration was 17.96 km2 in 1998. And the areas raise to be 354.45 km2 and 18.91 km2 in 1999 individually. The results indicate the soil losses intensity and administration strength were more than that of in 1998.Besides the functions of data entering, processing, querying, statistic and printout, the establis... |
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