Flood risk maps delineate areas potentially at risk of flooding and are thus a crucial tool in flood risk management. In Spain, such maps are provided as open geospatial data. This article compares the flood‐prone areas according to those maps for floods of different return periods with the spatial extent of two floods that severely affected southwestern Spain using open source optical and radar satellite imagery. Results using the recall metric were found to be very good and are the most relevant to emergency preparedness services as this metric focuses on the correctly predicted flooded areas. It was also found that the 500‐year flood risk map was the one with the best precision and accuracy for both flood events. The results confirm the accuracy of the flood risk maps based on open source remote sensing imagery and hence demonstrate the potential of publicly available and freely distributed remote sensing data in their development.

中文翻译：

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使用开源光学和雷达卫星图像验证洪水风险图

洪水风险图描绘了潜在的洪水风险区域，因此是洪水风险管理中的关键工具。在西班牙，此类地图是作为开放的地理空间数据提供的。本文根据开放源光学和雷达卫星图像，比较了不同返回期洪水的地图和两次严重影响西班牙西南部洪水的两次洪水的空间范围，比较了容易发生洪水的地区。使用召回结果该指标非常好，并且与应急准备服务最相关，因为该指标侧重于正确预测的洪水区域。还发现500年洪水风险图是两次洪水事件中精度和准确性最高的地图。结果证实了基于开源遥感影像的洪水风险地图的准确性，因此证明了在其开发过程中公开可用和自由分发的遥感数据的潜力。