Date of Images:

1/15/2022, 1/22/2022

Date of Next Image:

Unknown

Summary:

1/15/2022 (Copernicus Sentinel-1)

The Earth Observatory of Singapore - Remote Sensing Lab (EOS-RS) created this preliminary Damage Proxy Map (DPM) depicting areas that are likely damaged in the Vava'u and Ha'apai islands of Tonga due to the eruption of Hunga Tonga-Hunga Ha'apai volcano on 15 Jan 2022. This map was derived from synthetic aperture radar (SAR) images acquired by the Copernicus Sentinel-1 satellites operated by the European Space Agency (ESA) from 17 Sept 2021 to 15 Jan 2022.

1/22/2022 (JAXA ALOS-2)

The Earth Observatory of Singapore - Remote Sensing Lab (EOS-RS) created this preliminary Damage Proxy Map (DPM) depicting areas that are likely damaged in Tongatapu and southern Ha'apai islands of Tonga due to the eruption of Hunga Tonga-Hunga Ha'apai volcano on 15 Jan 2022. This map was derived from synthetic aperture radar (SAR) images acquired by ALOS-2 satellites operated by the Japan Aerospace Exploration Agency (JAXA) before (9 Mar 2019, 7 Mar 2020) and after (22 Jan 2022) the event.

Suggested Use:

The color variation from yellow to red indicates increasingly more significant surface change. Preliminary validation was done by comparing with high-resolution optical imagery. NOTE: On the JAXA ALOS-2 DPM on 1/22/2022, areas of yellow may indicate no change.

This damage proxy map should be used as guidance to identify damaged areas or areas affected by heavy volcanic ash fall, and may be less reliable over vegetated areas. For example, the scattered colored pixels over vegetated areas may be false positives, and the lack of colored pixels over vegetated areas does not necessarily mean no damage. This map is most sensitive to building damage and other large changes, but small-scale change or partial structural damage may not be detected by this map.

Satellite/Sensor:

Japan Aerospace Exploration Agency (JAXA) ALOS-2 PALSAR-2

Copernicus Sentinel-1 Synthetic Aperture Radar (SAR)

Resolution:

JAXA ALOS-2: 25 meters

Copernicus Sentinel-1: 30 meters

Credits:

Sentinel-1 data were accessed through the Copernicus Open Hub. The product contains modified Copernicus Sentinel data (2021-2022), processed by ESA and analyzed by the Earth Observatory of Singapore - Remote Sensing Lab (EOS-RS), using the Advanced Rapid Imaging and Analysis (ARIA) system originally developed at NASA's Jet Propulsion Laboratory, California Institute of Technology, and modified at EOS-RS.

The Earth Observatory of Singapore (EOS) coordinated with Sentinel Asia to timely task the ALOS-2 satellite. Data was analyzed by the Earth Observatory of Singapore - Remote Sensing Lab (EOS-RS).

Esri REST Endpoint:

See URL Section on right side of page

WMS Endpoint:

https://maps.disasters.nasa.gov/ags04/services/tonga_volcano_tsunami_202201/eosrs_dpm/MapServer/WMSServer

Data Download:

http://eos-rs-products.earthobservatory.sg/EOS-RS_202201_Tonga_HungaTonga_Volcano/

Groups