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水蚀荒漠化信息自动提取方法研究

DOI: 10.6046/gtzyyg.2012.04.15, PP. 88-94

Keywords: 水蚀荒漠化,信息提取,面向对象,层次分析法

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Abstract:

针对黄土高原地区水蚀荒漠化较为严重这一问题,建立了一套基于ETM+遥感数据和地理信息系统的水蚀荒漠化信息自动提取的技术方法体系,并对其信息提取精度进行了评价。该方法以NDVI(归一化植被指数)、KT3(KT变换后的湿度信息)、slope(坡度)、DEM(高程)及典型地物光谱数据作为水蚀荒漠化分类的特征波段,构建了决策树分类规则,有效剔除了研究区非水蚀荒漠化信息;引入面向对象多尺度分割技术,以坡度(slope)、沟谷密度(gullydensity)和植被覆盖度(vegetationcoverage)等作为水蚀荒漠化程度分级的特征波段,通过层次分析法(analytichierarchyprocess)确定特征波段的分割权重,实现了水蚀荒漠化程度的分级。该方法提取结果与目视解译结果的总体一致性为82.8%。

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