Damage Assessment in Malorua District, Shefa Province, Vanuatu as of 20 December 2024

Name: Damage Assessment in Malorua District, Shefa Province, Vanuatu as of 20 December 2024
Creator: United Nations Satellite Centre (UNOSAT)
License: http://www.opendefinition.org/licenses/cc-by-sa

✦ DISCOVERED BY ORIONAIUnited Nations Satellite Centre (UNOSAT)Buildings and infrastructureVanuatu

Vanuatu

About this dataset

**UNOSAT code: EQ20241217VUT, GDACS ID: 1458084** This map illustrates the potentially damaged structures/buildings and landslide extents resulting from the earthquake on December 17, 2024, in Vanuatu, as detected from a WorldView-2 very high-resolution satellite image acquired on December 20, 2024, at 09:46 local time. Within the analyzed area of approximately 3,000 hectares, UNOSAT identified 6 potentially damaged structures and 20 hectares of land affected by landslides. This is a preliminary analysis and has not yet been validated in the field. Please send ground feedback to United Nations Satellite Centre (UNOSAT).

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 of Waai area, Eastern part of Salahutu District, Maluku Tengah Regency, Maluku Province

**UNOSAT code: EQ20191001IDN** This map illustrates satellite based structure damage assessment in the Eastern part of Salahutu District, Indonesia that was affected by the 6.8 magnitude earthquake of the 26th of September 2019 with an epicenter located north of Kamarian in Kairatu District. UNITAR-UNOSAT has identified within the extent of this map 17 potentially damaged structures around Waai village in Salahutu District. Taking into account the pre-building footprints provided by Humanitarian OpenStreetMap we estimate to less than 2% the total number of structures potentially damaged. Taking into account the type of structural damage and the satellite based damage assessment analysis characteristics and limitations; it is possible that the damage is underestimated. This is a preliminary analysis and has not yet been validated in the field. Please send ground feedback to UNITAR-UNOSAT.