Sulawesi Island is a seismically active region where earthquakes with large magnitude and shallow depth are dominantly observed, particularly in Central Sulawesi. On 28 September 2018, a magnitude of 7.5 earthquake struck the island with the hypocenter located in Donggala Regency, about 80 km to the north of Palu city, at a depth of 10 to 15 km. The earthquake triggered a devastating 4 to 7 high tsunami and a geological process known as liquefaction. According to the Indonesia’s National Disaster Management Agency (BNPB), 2,081 people had died, 1,075 people were reported missing, and 4,400 people had major injuries. The worst affected area was Palu city where over 1,700 people were killed. The affected areas suffered extensive damage to buildings, transportation network, and infrastructure. An estimated 68,000 buildings were heavily damaged, and the estimated damages reached up to USD 910 million.
The Asian Development Bank (ADB) is implementing Emergency Assistance for Rehabilitation and Reconstruction (EARR) in Central Sulawesi, to support the Government of Indonesia on rehabilitation and reconstruction of damaged education, water supply, irrigation and flood protection infrastructure. The Geoportal is aimed at developing geospatial monitoring and evaluation (M&E) platform to provide information on critical infrastructure reconstruction, building, ground movements, and other information needed to support reconstruction monitoring after the 2018 Central Sulawesi earthquake. It is developed to support the National Disaster Response Information System (Indonesian: Sistem Informasi Tanggap Bencana - SITABA). The Geoportal provides satellite-based information generated from both optical and Synthetic Aperture Radar (SAR) data, for regular monitoring of land movement and reconstruction of buildings and infrastructures in the affected area.
Data and information available on the Geoportal are contributions of the following agencies:
The baseline data consists of basemap of spatial data such as administration boundaries, transportation (roads and bridges), buildings and utilities, land use/land cover, and Digital Terrain Model (DTM).
The reconstruction monitoring will provide output of SAR and VHR optical data analysis including ground displacement and stability of building and infrastructure (irrigation canal, road sections, etc.). Satellite-based damage assessment from Copernicus will be also provided here as baseline.
The satellite image will provide time-series of VHR Pleiades image, to provide visualization on the affected area or damaged buildings and infrastructures and to monitor the progress of the reconstruction work.
The hazard will provide information such as disaster zonation area and geological structures, and other relevant hazard information collected from different agencies such as LAPAN, BMKG, Geology Department, etc.
The rehabilitation/reconstruction activities will provide information from SITABA platform such as resettlement, irrigation canal, transportation infrastructure, etc., so that users can visualize and combine them with other layers to monitor the displacement or ground and building stability.