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TONGATongatapu IslandImagery analysis: 15 February 2018 | Published 26 February 2018 | Version 1.0

Tropical CycloneTC20180209TON

This map illustrates satellite-detected buildingdamage assessment as of 15 February 2018,over the eastern part of the city of Nuku-alofa andthe town of Popua, Tongatapu Island, Tonga,following the passage of the tropical cycloneGITA-18. The analysis was conducted using apost-event Pleiades image as of 15 February2018 and a pre-event WorldView-3 image as of12 January 2018. UNITAR-UNOSAT analysisidentified 637 potentially damaged structureswithin the area. According to the pre-eventbuilding footprints provided by Open Street Map,this represents 27% of the total number ofbuildings analyzed. Some areas have beenaffected by floods, such as the coast east ofNuku-alofa and the town of Popua. Here,buildings surrounded by floodwater areconsidered as potentially damaged. Overall, thesatellite detected damage level was severe, inthis part of the island. This is a preliminaryanalysis and has not yet been validated in thefield. Please send ground feedback to UNITAR -UNOSAT

¥¦¬Nuku'alofa

'Eua

Tongatapu

The depiction and use of boundaries, geographic names and related data shown here are not warranted to be error-free nor do they implyofficial endorsement or acceptance by the United Nations. UNOSAT is a program of the United Nations Institute for Training and Research(UNITAR), providing satellite imagery and related geographic information, research and analysis to UN humanitarian & developmentagencies & their implementing partners. This work by UNITAR-UNOSAT is licensed under a CC BY-NC 3.0.

Damage Assessment of easternpart of Nuku-alofa, TongatapuIsland, Tonga

Satellite Data (Post): PleiadesImagery Date: 15/02/2018Resolution: 50 cmCopyright: CNES 2018 DistributionAirbusDefence and SpaceSource: Airbus Defence and Space

Satellite Data (Pre): WorldView-3Imagery Date: 12/01/2018Resolution: 31 cmCopyright: DigitalGlobe, IncSource: USGS-HDDS

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

!IMap Scale for A3: 1:14,000

Analysis conducted with ArcGIS v10.4.1Coordinate System: WGS 1984 UTM Zone 1SProjection: Transverse MercatorDatum: WGS 1984Units: Meter

Map location

INSET: 10 May 2015INSET 2: 12 January 2018

Æ5

INSET 1: 15 February 2018

Legend") Damaged building

Road

See insets 3 and 4 for close-up view of flooded buildings

INSET 3: 15 February 2018 INSET 4: 12 January 2018

See insets 1 and 2 for close-up view of damaged & destroyed structures

Popua49%

Nuku-alofa