- General Characteristics
The DAMSAT Scenario Model can provide change index maps related to damage caused by destructive earthquakes. It is based on pre- and post-event satellite imagery combination. Such change indexes are then integrated to obtain a damage classification map (quantitative) or a damage proxy map (qualitative). The Scenario Model is triggered in case of a destructive event, and starts by verifying the already existing satellite images over the hit area, downloading them and starting the preprocessing steps (e.g. import, clip over the AOI, etc.). Based on these pre-event data, the first post-earthquake data (SAR and Optical) with the same acquisition geometries are identified in order to provide a forecast of products delivery. In addition Ancillary data, such as DEM and buildings footprints are collected. Once the dataset is complete, the algorithms for change detectors calculation and damage mapping generation can be executed.
- Specific Products Description
The product is a vector type dataset, in esri-shapefile format, where each object refers to a likely damaged area, or a classified damage objects/buildings (i.e., low, medium, high level .
Fig. 1: a) example of damage proxy map. Blue polygons refer to likely damaged buildings; b): example of classified damage buildings.
- Products Availability (spatial resolution, spatial coverage, temporal resolution, delay, error etc.)
The products can be delivered a few hours after the post-event image acquisition. The estimated accuracy ranges between 70% to 80%. Typically, the spatial coverage can reach 10 km x 10 km, and the resolution depends on the used satellite data (3m to 20 m). Depending on the EO resolution and the available ancillary data (such as building footprints) the maps can be delivered at city block scale, or at single building scale.