Tropical Cyclones Judy And Kevin, Preliminary Satellite-derived Assessment in Vanuatu-Penama, Malampa, Shefa, and Tefea Provinces

Name: Tropical Cyclones Judy And Kevin, Preliminary Satellite-derived Assessment in Vanuatu-Penama, Malampa, Shefa, and Tefea Provinces
Creator: United Nations Satellite Centre (UNOSAT)
License: http://www.opendefinition.org/licenses/cc-by-sa

✦ DISCOVERED BY ORIONAIUnited Nations Satellite Centre (UNOSAT)EnvironmentVanuatu

Vanuatu

About this dataset

**UNOSAT code TC20230227VUT, GDACS Id: 1000965** Status: Landslide, potentially affected road and damaged houses observed. Further action(s): Continue monitoring Summary of findings; Based on satellite images acquired on 04th, 09th and 11th of March 2023, the findings are the following: Tanna Island, Tafea Province; Widespread affected forest observed over Tanna Island; Potentially affected houses observed in West Tanna Council, Tafea Province; Widespread damaged houses observed in Lawir Village, Tanna Island, North Tanna Council, Tafea Province; Efate Island, Shefa Province; Widepsread affected forest observed over Efate Island; Tongoa Island, Shefa Province Widespread affected forest observed over Tongoa Island; South Pentecost Island, Penama Province No visible affected forest observed over cloud free areas in South Pentecost Island, South Pentecost Council, Penama Province; Ambae Island, West Ambae Council, Penama Province; Landslide observed in Ambae Island, West Ambae Council, Penama Province ; Affected shoreline observed in Ambae Island, West Ambae Council, Penama Province ; Potentially affected road and potentially affected houses observed in Ambae Island, West Ambae Council, Penama Province ; Malekula Island, Malampa Province; Affected shoreline observed in South Malekula Council, Malampa Province;

Documentation

UNOSAT datasets and maps are produced using a variety of methods. In general, analysts closely review satellite imagery, often comparing two or more images together, and determine notable changes between the images. For damage assessments, refugee or IDP assessments, and similar analyses, these changes are then manually documented in the vector data by the analyst. For flood extractions, landcover mapping and similar analyses, a variety of automated remote sensing techniques are used to extract the relevant information which is then reviewed and revised as necessary by the analyst. In all cases, resulting data is then loaded into a standardized UNOSAT geodatabase and exported asshapefiles for dissemination. This is a preliminary assessment and has not yet been validated in the field. It is important to consider the characteristics of the source imagery used in the analyses when interpreting results. For damage assessments it should be noted that only significant damage to the structural integrity of the buildings analyzed can be seen in imagery, while minor damage such as cracks or holes may not be visible at all. For flood extractions using radar data it is important to note that urban areas and highly vegetated areas may mask the flood signature and result in underestimation of flood waters. Users with specific questions or concerns should contact unosat@unitar.org to seek clarification.

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Damage Assessment in North Tanna Council, Tanna Island - Tafea Province, Vanuatu

**UNOSAT code TC20230227VUT, GDACS Id: 1000965** This map illustrates damaged and potentially damaged structures and buildings in Tanna Island, Tafea Province of Vanuatu as detected using WorldView-2 satellite image acquired on 04 March 2023 after the passage of Kevin and Judy tropical cyclones. Within the analysed area UNOSAT identified 57 damaged and 88 potentially damaged structures. This is a preliminary analysis and has not yet been validated in the field. Please send ground feedback to United Nations Satellite Centre (UNOSAT).