Comparison of SAR amplitude vs. coherence flood detection methods - a GIS application
Comparison of SAR amplitude vs. coherence flood detection methods - a GIS application
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SAR 幅度与相干洪水检测方法的比较 - GIS 应用
DOI：
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发表时间：
2000
期刊：
影响因子：
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通讯作者：
S. Samarelli
中科院分区：
文献类型：
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作者：
G. Nico;M. Pappalepore;G. Pasquariello;A. Refice;S. Samarelli
利用多程合成孔径雷达（SAR）数据可以通过幅度变化检测技术进行洪水区域检测。这些方法允许仅在第二次通过时而不是在第一次通过时被水淹没时才区分水淹区。可以使用从多程合成孔径雷达干涉测量法获得的相干性，作为地表电磁散射行为变化的指标，从而有可能揭示两次通过之间任何时候受洪水事件影响的所有地区。本文介绍了这种技术的原型应用，即从ERS-1/2数据超过贝济耶（法国南部），通过适当的阈值的振幅和相干信息的组合获得的洪水图。该地图是在欧空局一个项目的框架内制作的，由一个可直接输入大多数商业地理信息系统软件的矢量文件组成。
Flood area detection from multipass Synthetic Aperture Radar (SAR) data can be performed via amplitude change detection techniques. These methods allow flooded zones to be discriminated only when they are flooded at the time of the second passage, and not at the time of the first one. Coherence derived from multipass SAR interferometry can be used instead, as an indicator of changes in the electromagnetic scattering behaviour of the surface, thus potentially revealing all the areas affected by the flood event at any time between the two passes. The paper presents a prototype application of such techniques, that is, a flood map obtained from ERS-1/2 data taken over Beziers (Southern France), through proper thresholding of a combination of amplitude and coherence information. Produced in the framework of an ESA project, the map consists of a DXF vector file which can be imported directly into most commercial GIS software.