3.3. Data processing methods
Changes happened to a target’s surface roughness, geometric
and structural characteristics will result in the change of its backscattering
intensity recorded in SAR image. Comparison between
the pre- and post-earthquake SAR intensity images will reveal
the damage information caused by earthquakes, such as landslides,
barrier lakes and building damages.
Change detection between ALOS PALSAR images acquired preand
post-earthquake revealed secondary geological disasters
caused by this destructive earthquake, which helped responders
to quickly collect damage information from a large quake-hit area.
To compare the pre- and post-earthquake acquisition data, an