Exploitation of Satellite Data for the Mapping of Areas at Risk of Flooding in Grand-Bassam (Côte d’Ivoire)

Extraction and mapping of downpour impact and their Cumulonimbus origin, 20 May 2020, Vâlcea (Romania) via Sentinnel-1 SAR dual polarization

“…In order to extract and map surfaces entirely or almost covered with water, several methods and approaches have been proposed by exploiting the properties of the SAR radar wave of the recorded signal. Many studies apply thresholding from the numerical values of the backscatter coefficient for a single or each separate polarization, then come the steps using the comparison of the accuracies of the polarizations to delimit and refine the different results, such as 7,9,[12][13][14][15][16][17][18][19][20][21][22] . Other works have used indices by calculating them with only one polarization, i.e.…”

“…Since the launch by ESA (European Space Agency) of the series of Earth observation satellites, Sentinel-1, Sentinel-1A (April 3, 2014) followed by Sentinel-1B (April 25, 2016), several works have been accentuated in several domains, especially in the mapping of temperate zones following the climatic and meteorological hazards observed, such as, the estimation of sea wind speed along the Iroise Coast in France 5 ; the mapping and characterization of the hydrological dynamics of the Poitevin coastal marsh in France 6 ; the mapping of floods in urban areas, 2018 floods of Ankara (Turkey) 7 ; the study of the properties of the snowpack and the mapping of wet snow in the Northern French Alps 8 ; the mapping of flash flood areas of eight upazilas in Sunamganj district, Bangladesh 9 ; the mapping of the 2015 floods in the city of Chennai and the 2018 flood event of Kerala in India 10,11 ; the mapping and monitoring of floods and their impact on the Ramganga River in the Ganges basin 12 ; the mapping of extraordinary floods that occurred during the month of April 2018 in Ebro River (Spain) 13 ; the monitoring and the optimization of flood mapping for regions of the lower Mekong basin in Vietnam 14,15 ; the detection and mapping of floods due to incessant rains and rising water levels in the Rapti and Ghaghara rivers during the month of August 2017 in the state of Uttar Pradesh in India 16 ; the mapping of floods in the San-Pédro river basin and of areas at risk of flooding in Grand-Bassam in Côte d'Ivoire 17,18 ; the monitoring the impact of cyclonic events in Madagascar 19 ; the mapping flooding caused by Tropical Cyclone Cempaka in the Gunung Sewu karst landscape 20 ; the flood mapping and assessment of their impacts on the Sperchios river basin in Greece 21 ; the mapping the flood Inundation in Xinxiang City, Henan Province China 22 .…”