(ERI) What can lead to false detection?

Building Damage Classification

As the heatmap is an estimate of change, it is likely that false positives unrelated to damage are included in the scene. These detections may not be relevant to the user attempting to judge damage, so they are good to be aware of.

• Highly angled roofs may produce spurious detections
• Small vertical roof structures (e.g. chimneys, A/C exhausts) may produce spurious detections

Raster Damage Heatmap

This layer provides change estimates for the entire imaged area and is intended to complement the building-level outputs. It is likely that false positives unrelated to damage are included in the scene in non-structural areas. These detections may not be relevant to the user attempting to judge damage, so they are good to be aware of.

• Low lying vegetated areas provide less reliable reflection and can be prone to false positives. Typically, wet soil is the causal factor.
• Riverbanks have been observed to provide false detections and can at points be adjacent to structures.
• Variable occupancy areas e.g., parking lots can be prone to false detections if they are occupied before or after the earthquake at varying capacity.