Venezuela earthquake (EMSR884)

Every source is projected onto one shared base of Overture building footprints, so all sources use the same unit: buildings. A footprint is flagged as damaged for a source where that source's data intersects it. Microsoft footprints are matched directly. Copernicus EMS and HotOSM damage points are snapped to the nearest footprint within 20 m. The radar sources (IMPACT SAR, OSU) are sampled at each building.

Each source is evaluated only within its area of interest, such as a Copernicus activation footprint, a radar swath, or a model's coverage mask. Only buildings inside that area are counted as analysed. Outside it, the source has no data (not zero damage). All rates use the analysed area.