Product ID: 2778 - English
Published: 28 Feb, 2018
GLIDE: TC20180209TON

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This report illustrates preliminary building damage assessment overview, that provides percentages of buildings damaged per district in Tongatapu Island (Tonga) by the different mapping groups (UNOSAT, Copernicus EMS) as of 28 February 2018. In response to the emergency caused by GITA-18, UNITAR-UNOSAT & Copernicus EMS performed building damage assessment analyses using pre- and post-event satellite data. In the present document, UNITAR-UNOSAT compiles the main results of these analyses in one map in order to present a comprehensive building damage overview covering the most affected areas. Figures are based upon analysis of satellite imagery acquired from the 13 to 21 February 2018, as well as pre baseline data from Open Street Map contributors as of 12 February 2018. It is important to note that building damage estimates are based exclusively on satellite imagery analysis and it has not been validated in the field.
Satellite Data (Post): Pleiades
Imagery Dates: 14, 15, 16 & 21/02/2018
Resolution: 50 cm
Copyright: CNES 2018 Distribution AirbusDefence and Space
Source: Airbus Defence and Space
Satellite Data (Post & Pre): WorldView-2 & WorldView-3
Imagery Date: 13/02/2018 / 12/01/2018
Resolution: 50 cm
Copyright: DigitalGlobe, Inc
Road data & building footprints : OpenStreetMap contributors (12/02/2018)
Analysis : UNITAR - UNOSAT
Production: UNITAR - UNOSAT