Satellite imagery supports disaster response and humanitarian crisis situations by providing near rea-time data which may be impossible via other means.
Through the use of satellite images and GIS mapping, disaster response officials are able to acquire a wealth of information for assessment, analysis, and monitoring of natural disasters such as landslides.
Pre – landslide Very-high resolution satellite image captured over Naga Cebu Philippines
On September 20, 2018, a huge landslide happened in a residential area in Naga Cebu, Philippines triggered by heavy rainfall and quarrying operations near a residential area over Naga Cebu. Prior to the landslide, the area had been identified by the authorities as a landslide-prone area.
With the use of remote sensing and satellite imagery, developing a crisis map could help disaster response and management support team an immediate overview of the extent of damage of a landslide.
Change detection algorithms applied on pre and post landslide satellite images highlight the extent of damage of the large scale landslide within the targeted area.
landslide extent processed by ProImagery from high-resolution pre and post landslide images using change detection algorithms.
Due to this landslide, many houses and properties were buried and killed 78 people with 5 others missing. With the use of various remote sensing techniques, the buildings and houses near the quarrying site were able to be pinpointed based on very high-resolution pre-landslide satellite images.
Extracted building locations based from very high-resolution pre-landslide satellite image
A very high-resolution post-landslide satellite image captured over the area shows clearly the damage extent of the landslide. The processed landslide extent and building locations show which houses were possibly buried. This critical information could have helped rescuers on search and rescue operations in the ground.
Extracted information from very-high-resolution satellite imagery to determine buildings, houses, and properties possibly buried by the extent of landslide
With 3D modeling techniques by integrating Digital elevation models and satellite imagery, a 3D view of the extent of damage of the landslide can be done. With the use of 3D technology, disaster management and responders would have an idea of the terrain of the affected area so that proper heavy equipment can be readied.
3D visualization for the extent of damage to the landslide. The blue dots indicate the existing building in the area while the red dots are the housed affected or buried by the landslide