Product ID: 2775 - English
Published: 26 Feb, 2018
GLIDE: TC20180209TON
FootPrint (Lat x Long, WSG84 Geographic, decimal degrees)
TopLeft: -21.1601398 x -175.1435462
BottomRight: -21.1326963 x -175.1850904

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This map illustrates satellite-detected building damage assessment as of 15 February 2018, over the eastern part of the city of Nuku-alofa and the town of Popua, Tongatapu Island, Tonga, following the passage of the tropical cyclone GITA-18. The analysis was conducted using a post-event Pleiades image as of 15 February 2018 and a pre-event WorldView-3 image as of 12 January 2018. UNITAR-UNOSAT analysis identified 637 potentially damaged structures within the area. According to the pre-event building footprints provided by Open Street Map, this represents 27% of the total number of buildings analyzed. Some areas have been affected by floods, such as the coast east of Nuku-alofa and the town of Popua. Here, buildings surrounded by floodwater are considered as potentially damaged. Overall, the satellite detected damage level was severe, in this part of the island. This is a preliminary analysis and has not yet been validated in the field. Please send ground feedback to UNITAR - UNOSAT
Satellite Data (Post): Pleiades
Imagery Date: 15/02/2018
Resolution: 50 cm
Copyright: CNES 2018 Distribution AirbusDefence and Space
Source: Airbus Defence and Space
Satellite Data (Pre): WorldView-3
Imagery Date: 12/01/2018
Resolution: 31 cm
Copyright: DigitalGlobe, Inc
Source: USGS-HDDS

Road data & building footprints : OpenStreetMap contributors (12/02/2018)
Analysis : UNITAR - UNOSAT
Production: UNITAR-UNOSAT