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首页> 外文会议>Proceedings of GlobWetland: Looking at Wetlands from Space >A MAP OF TEMPORARY WATER BODIES IN WESTERN AFRICA
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A MAP OF TEMPORARY WATER BODIES IN WESTERN AFRICA

机译：西部非洲临时水体图

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摘要

An algorithm developed for the SPOT VEGETATION (VGT) sensor makes it possible to detect temporary small water bodies in arid and semi-arid areas by analysing the spectral contrast of each pixel compared to its neighbourhood. This algorithm captures surface water and humid areas, the last category being likely to include vegetation. These maps are generated every 10 days allowing to monitor the small temporary water bodies and humid area seasonality. In addition, a reference map of the temporary water bodies was prepared by validating the historical record of the small water body detection. The procedure consists in checking individually any SPOT VGT water bodies detection that lasted for more than 3 consecutive dekads between 1999 and late 2004. The validation has been done over Western Africa. Several sources of information have been used to validate the detections: the Global Lakes and Wetlands Database (GLWD), the Drainage Network of the Digital Chart of the World, Spot VGT colour composite images, the SRTM digital elevation model, Landsat quicklook images and Google Earth. Pixels of the history of occurrence that were not referenced in the GLWD or DCW database have been checked manually. This validation process resulted in a map of three categories: validated water bodies, positive vegetation anomaly with no obvious sign of water but indicating water availability in arid areas and false detections.
机译：为SPOT VEGETATION（VGT）传感器开发的算法可通过分析每个像素与其周围区域的光谱对比度来检测干旱和半干旱地区的临时小水体。该算法捕获地表水和潮湿区域，最后一类可能包括植被。这些地图每10天生成一次，可以监视小型临时水体和潮湿区域的季节性。另外，通过验证小水体探测的历史记录，绘制了临时水体的参考图。该程序包括单独检查在1999年至2004年底之间连续进行了3次以上碱度的SPOT VGT水体检测结果。验证已在西非完成。已使用多种信息来源来验证检测结果：全球湖泊和湿地数据库（GLWD），世界数字海图排水网络，Spot VGT彩色合成图像，SRTM数字高程模型，Landsat quicklook图像和Google地球。 GLWD或DCW数据库中未引用的发生历史像素已经过人工检查。该验证过程产生了三类地图：经过验证的水体，没有明显水迹的正植被异常，但指示干旱地区的水可利用量和错误检测。

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