Integration of remote sensing data and GIS for accurate mapping of flooded areas
Integration of remote sensing data and GIS for accurate mapping of flooded areas
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DOI：
10.1080/01431160010014729
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发表时间：
2002-02-01
影响因子：
3.4
通讯作者：
Tomasoni, R
中科院分区：
文献类型：
--
作者：
Brivio, PA;Colombo, R;Tomasoni, R
本文描述了卫星雷达图像和辅助信息的协同使用，以探测洪水高峰期的洪水区域，并通过制图评估其潜力。该程序在1994年11月意大利皮埃蒙特地区发生的灾难性洪水上进行了试验。对两幅ERS-1合成孔径雷达（SAR）图像进行了处理，其中一幅是在洪水发生前一个月拍摄的，另一幅是在洪水发生后三天拍摄的。进行了视觉判读和两种不同的阈值处理技术。由于洪峰和卫星立交桥之间的时间延迟，绘制的洪水地图只显示了实际被淹没土地的一小部分（20%）。为了克服这一限制，作者开发了一种新的程序，通过将来自SAR图像的洪水面积与来自GIS技术的数字地形数据相结合，来估计高峰时段的洪水面积。通过该方法，覆盖了当地政府官方记录的96.7%的淹没面积。该方法即使是在洪水发生几天后才获得卫星数据，也适用于洪水地区的测绘，从而克服了SAR图像在水文应用中的时间分辨率限制。
This paper describes a synergetic use of satellite radar images and ancillary information to detect flooded areas at their peak and evaluates its potential with mapping. The procedure was tested on the catastrophic flood that occurred in Regione Piemonte in Italy in November 1994. Two ERS-1 synthetic aperture radar (SAR) images were processed, one acquired one month before the flood and the other acquired three days after the event. Visual interpretation and two different thresholding techniques were performed. The flood map derived shows only a small fraction (20%) of the actually flooded lands because of the time delay between the flood peak and the satellite overpass. To overcome this limitation, the authors developed a new procedure to estimate the flooded area at the peak time by integrating the flooded area from SAR imagery with digital topographic data from a GIS technique. This method allowed inundated areas covering 96.7% of the flooded area officially recorded by the local government to be mapped. The proposed procedure is suitable for mapping flooded areas even when satellite data are acquired some days after the event, thus overcoming the constraint of temporal resolution in the application of SAR imagery in hydrology.