New from UNOSAT download satellite-derived flood data in GIS vector format from the United Nations. It covers the period 2007 onwards and was developed to aid humanitarian aid agencies and can be downloaded into into online maps, ArcGIS and other GIS systems, such as Google Earth, UNOSAT also has a broader GIS and map online library covering humanitarian crises.
Another good source for this is the Humanitarian data exchange which is supported by Reliefweb and OCHA.
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