Table 1 Damage level and damage description.

From: Post-disaster building damage assessment based on improved U-Net

Number

Damage level

Damage description

0

No damaged

No sign of water, structural or burn damage

1

Minor damaged

Water or volcanic flow around buildings, roof cracks

2

Major damaged

Some walls or roofs collapse and were surrounded by water

3

Destroyed

Charred, completely collapsed, wholly or partially covered with water, or disappeared