Abstract
Abstract. Flood events frequently occur due to -most probably- climate change on our planet in the recent years. Rapid urbanization also causes imperfections in city planning, such as insufficient considerations of the environmental factors and the lack of proper infrastructure development. Mapping of inundation level following a flood event is thus important in evaluation of flood models and flood hazard and risk analyzes. This task can be harder in urban areas, where the effect of the disaster can be more severe and even cause loss of lives.With the increased temporal and spatial availability of SAR (Synthetic Aperture Radar) data, several flood detection applications appear in the literature although their use in urban areas so far relatively limited. In this study, one flood event occurred in Ankara, Turkey, in May 2018 has been mapped using Sentinel-1 SAR data. The preprocessing of Sentinel-1 data and the mapping procedure have been described in detail and the results have been evaluated and discussed accordingly. The results of this study show that SAR sensors provide fast and accurate data during the flooding using appropriate methods, and due to the nature of the flood events, i.e. heavy cloud coverage, it is currently irreplaceable by optical remote sensing techniques.
Highlights
Flooding has been frequently observed recently throughout the world and most of the flooding events occur in a destructive manner
The advancements in remote sensing methods coupled with new sensor technologies and launch of Earth Observation (EO) satellites have been increasingly improving the mapping methods from space under difficult circumstances, such as thick clouds, rugged terrain or other inflexible geographical or meteorological conditions
Optical sensors are affected by the cloud cover and cannot supply useful data at night either
Summary
Flooding has been frequently observed recently throughout the world and most of the flooding events occur in a destructive manner They harm urban infrastructure, agricultural land, and even cause loss of lives. The advancements in remote sensing methods coupled with new sensor technologies and launch of Earth Observation (EO) satellites have been increasingly improving the mapping methods from space under difficult circumstances, such as thick clouds, rugged terrain or other inflexible geographical or meteorological conditions. Both optical and microwave sensors are important data providers for flood mapping and monitoring. The temporal and spatial availability of SAR (Synthetic Aperture Radar) data has been increasing, and flood detection is candidate to be a very popular application area of SAR data
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