Product ID: 2774 - English
Published: 23 Feb, 2018
GLIDE: TC20180209TON

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This map illustrates satellite-detected building damage assessment as of 15 February 2018, over the towns of Holonga, Malapo, Vaini, Longoteme and Fohala, Tongatapu Island, Tonga, following the passage of the tropical cyclone GITA-18. The analysis was conducted using post-event Pleiades images as of 15 and 16 February 2018 and pre-event WorldView-3 images as of 12 January 2018. UNITAR-UNOSAT analysis identified 354 potentially damaged structures within the area. According to the pre-event building footprints provided by Humanitarian Open Street Map, this represents 21% of the total number of buildings analyzed. Overall, the satellite detected damage level was moderate to 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 Dates: 15/02/2018 and 16/02/2018
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
Road data and building footprints: OpenStreetMap (12/02/2018)
Health centres: Healthsites (12/02/2018)
Analysis : UNITAR - UNOSAT
Production: UNITAR - UNOSAT