Airborne and terrestrial lidar are rapid and accurate techniques for remote measurement of terrain elevations with many applications,
such as for digital terrain elevation measurement, volume determination, assessment of forest resources, coastal land erosion and
many more. For disaster monitoring, typical examples of airborne lidar are flood prediction and assessment, monitoring of the
growth of volcanoes and assistance in the prediction of eruption, assessment of crustal elevation changes due to earthquakes, and
monitoring of structural damage after earthquakes. Change detection is an important task in the context of disaster monitoring.