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基于多尺度层的遥感影像分类问题研究 总被引:1,自引:0,他引:1
近年来,基于面向对象的遥感影像分类方法已经被广泛使用,这种方法与传统的基于像元的分类方法相比较,精度较高,是以对象作为分类的最小单元,所以,对于面向对象的分类方法其关键就是如何获取较高精度的对象,本文是在对遥感影像进行不同尺度分割的基础上,得到不同尺度的对象,然后依据对象的分割精度,选择相应尺度再进行分类。实验证明,这种方法可以有效提高遥感影像的分类精度。 相似文献
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STREAMFLOW CHARACTERISTICS OF THE EASTERN QINGHAI-XIZANG PLATEAU 总被引:1,自引:0,他引:1
The eastern Qinghai-Xizang (Tibet) Plateau is the headwater area for many large Asian rivers. Permafrost occurs above 4,200 m a.s.l. and glaciers occupy the summits and high valleys of the east-west trending mountain chains. Annual runoff generally increases with precipitation which is augmented southward by the rise in topography. Rainfall, snow melt, glacier melt and groundwater are the primary sources of stream flow, and the presence of permafrost enhances the flashiness of runoff response to rainfall and snowmelt events. Peak flows are concentrated between June and September. And winter is low flow season. Three types of runoff patterns may be distinguished according to their primary sources of water supply: snowmelt and rainfall, glacier melt and snowmelt, and groundwater. Large rivers generally drain more than one environments and their runoff regime reflects an integration of the various flow patterns on the plateau. 相似文献
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