Product ID: 2772 - English
Published: 21 Feb, 2018
GLIDE: TC20180209TON


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This map illustrates satellite-detected building damage assessment as of 16 February 2018, over the towns of Nukuleka, Hoi, Mua and Alaki, Tonga, following the passage of the tropical cyclone GITA-18. The analysis was conducted using post-event Pleiades images and a pre-event WorldView-3 image as of 12 January 2018. In total, 662 buildings were detected as potentially damaged. According to pre-event building footprints provided by Humanitarian OpenStreet Map, this represents ~46% of the total number of buildings present in the area. The town of Hoi was majorly hit, being 69% of the buildings potentially affected by the cyclone. The overall estimated damage level is classified as severe. 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 Airbus Defence and Space
Source: Airbus Defense and Space
Satellite Data (Pre): WorldView-3
Imagery Date: 12/01/2018
Resolution: 31 cm
Copyright: DigitalGlobe Inc.
Source: USGS-HDDS

Building footprints & road data: Humanitarian OpenStreetMap (12/02/2018)
Health centres: Healthsites (12/02/2018)
Analysis : UNITAR - UNOSAT
Production: UNITAR - UNOSAT