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NIGERIABayelsa StateIm agery analy sis: 16, 21, 22 & 28 Septem ber ; 3 October 2018 | Published 11 October 2018 | Version 1.0
Flash Flood
FL20180925NGA
This map illustrates an analysis of the evolution ofsatellite-detected surface waters in Bayelsa State,Nigeria, based on satellite data recorded on 16, 21,22, 28 September and 03 October 2018. Before thenational flood had been declared by the governmentof Nigeria on 18 September 2018, a total surface of79,902 ha was detected as inundated within BayelsaState, as of 16 September 2018. On 21 and 22September 2018 an additional surface of 5,280 hainundated areas were detected, representing anincrease of the surface waters of 7%. On 28September 2018, a total surface of 86,900 ha wasdetected as inundated, representing an increase ofthe surface waters of 2%. Then, on 03 October 2018,the water extent had increased by 4%, a total of90,583 ha detected as inundated. According to theWorldpop data and the satellite detected waters fromSentinel-1 images, the total population affected bythe floods rose from approximately 105,000 to145,000. This is a preliminary analysis and has notyet been validated in the field. Please send groundfeedback to UNITAR - UNOSAT.
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NIGERIACAMEROONGHANA
BENIN
Lom éAccra
Abuja
Niam ey
MalaboYaound‚
Ndjam ena
Porto-Novo
The depiction and use of boundaries, geographic names and related data shown here are notwarranted to be error-free nor do they imply official endorsement or acceptance by the UnitedNations. UNOSAT is a program of the United Nations Institute for Training and Research(UNITAR), providing satellite imagery and related geographic information, research and analysisto UN humanitarian & development agencies & their implementing partners. This work byUNITAR-UNOSAT is licensed under a CC BY-NC 3.0.
Evolution of satellite-detected waterextent over Bayelsa State, Nigeria
Satellite Data (1): Sentinel-1Imagery Dates: 16 September 2018Resolution: 10 mCopyright: ESA 2018Source: ESA
Satellite Data (2): Sentinel-1Imagery Date: 21 September 2018Resolution: 10 mCopyright: ESA 2018Source: ESA
Satellite Data (3): Sentinel-1Imagery Date: 22 September 2018Resolution: 10 mCopyright: ESA 2018Source: ESA
Satellite Data (4): Sentinel-1Imagery Date: 28 September 2018Resolution: 10 mCopyright: ESA 2018Source: ESA
Satellite Data (5): Sentinel-1Imagery Date: 03 October 2018Resolution: 10 mCopyright: ESA 2018Source: ESA
Administrative boundary: Office for theSurveyor General of the Federation ofNigeria (OSGOF), Ehealth, United NationsCartographic Section (UNCS)Population: Worldpop (2015 UN adjusted)Reference water: Digital Chart of the World(DCW), Environmental Systems ResearchInstitute (ESRI)
Satellite detected water extent: UNITAR -UNOSATAnalysis : UNITAR - UNOSATProduction: UNITAR - UNOSAT
Analysis conducted with ArcGIS v10.4.1
Coordinate System: WGS 1984 UTM Zone 32NProjection: Transverse Mercator
Datum: WGS 1984
Æ?
Country boundaryState boundaryLocal Government Area (LGA) boundary Reference waterFlood water extent as of 16 September 2018Flood water extent as of 21 September 2018Flood water extent as of 22 September 2018Flood water extent as of 28 September 2018Flood water extent as of 03 October 2018
Legend
Map location
0 6 12 18 24 303Km!I
Map Scale for A3: 1:620,000
