Monitoring Seasonal Changes in the Water Surface Areas of Reservoirs Using TerraSAR-X Time Series Data in Semiarid Northeastern Brazil
Monitoring Seasonal Changes in the Water Surface Areas of Reservoirs Using TerraSAR-X Time Series Data in Semiarid Northeastern Brazil
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DOI：
10.1109/jstars.2014.2323819
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发表时间：
2014-08-01
影响因子：
5.5
通讯作者：
Foerster, Saskia
中科院分区：
文献类型：
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作者：
Heine, Iris;Francke, Till;Foerster, Saskia
位于巴西东北部的933 km（2）Bengue集水区的特点是雨季和旱季明显不同。降水储存在大小不一的水库中，这对当地居民至关重要。利用TerraSAR-X SM（HH）卫星数据，对2011年7月至2012年7月的库区季节变化进行了为期一年的监测。监测基于上行通道方向的采集，偶尔辅以下行通道图像。为了检测水面面积，进行直方图分析，然后进行全局阈值分类，并使用现场GPS数据验证结果。区分小型水库和类似的黑暗地区是困难的。因此，我们测试了几种识别错误分类区域的方法。水库的表面积动态的分析表明，高的空间和时间的异质性和大量减少的水库在集水区的总水面面积约30%，在一年内。
The 933 km(2) Bengue catchment in northeastern Brazil is characterized by distinct rainy and dry seasons. Precipitation is stored in variously sized reservoirs, which is essential for the local population. In this study, we used TerraSAR-X SM(HH) data for an one-year monitoring of seasonal changes in the reservoir areas from July 2011 to July 2012. The monitoring was based on acquisitions in the ascending pass direction, complemented by occasional descending-pass images. To detect water surface areas, a histogram analysis followed by a global threshold classification was performed, and the results were validated using in situ GPS data. Distinguishing between small reservoirs and similar looking dark areas was difficult. Therefore, we tested several approaches for identifying misclassified areas. An analysis of the surface area dynamics of the reservoirs indicated high spatial and temporal heterogeneities and a large decrease in the total water surface area of the reservoirs in the catchment by approximately 30% within one year.