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以云南省澄江县尖山河小流域为研究区,以2002年IKONOS和2006年快鸟(QuickBird)高分辨率影像及1∶10 000地形图为数据源,以面向对象影像分析软件Definiens professional 5为技术平台,研究提出了基于面向对象分类技术的小流域土壤侵蚀遥感监测方法。在该方法中,面向对象遥感影像土地利用分类方法和基于植被对象的林草植被覆盖度计算方法是关键技术。并将这种新方法应用到研究区,对研究区2002年和2006年的土地利用类型进行了分类,计算分析了林草植被覆盖度,并在叠加坡度因子后分析获得了研究区2002年和2006年的土壤侵蚀强度图,实现了小流域土壤侵蚀动态变化遥感监测。监测结果表明:2002年至2006年,研究区坡耕地和荒山荒坡面积急剧减少,乔木林和梯地面积急剧增加,林草地面积及其植被覆盖度也大为提高,土壤侵蚀面积大幅度减少,侵蚀强度明显减轻,小流域综合治理已经取得了显著成效。
Taking the Jianshanhe watershed of Chengjiang County, Yunnan Province as a study area, data from IKONOS and QuickBird high resolution images in 2002 and 1:10 000 topographic maps were taken as data sources and the object-oriented image analysis software Definiens professional 5 Technology platform, this paper proposes a remote sensing monitoring method for soil erosion based on object-oriented classification in small watershed. In this method, the land use classification of object-oriented remote sensing images and the calculation method of vegetation coverage based on vegetation objects are the key technologies. The new method was applied to the study area. The types of land use in 2002 and 2006 in the study area were classified. The coverage of forest and grass vegetation was calculated and analyzed. After the analysis of the slope factor, 2006 soil erosion intensity map to achieve a small watershed soil erosion dynamic changes in remote sensing monitoring. The monitoring results show that from 2002 to 2006, the area of sloping farmland and barren hills and slopes decreased sharply, the area of arbor forest and terrace increased sharply, the area of forest and grassland and its vegetation coverage also increased greatly, and the area of soil erosion decreased significantly , The erosion intensity is obviously reduced, and the comprehensive management of small watersheds has achieved remarkable results.