Have a look at these before and after photos of Brisbane during the floods of 2011.
The special thing about these photos is the technology, which uses high-resolution aerial photos taken over various suburbs and the CBD which reveals the scale of the devastation.
There is a black line in each photo, which you hover over using your mouse, and then you drag the line to the left of the photo, revealing the extent of the flood – just amazing.
Today we have so much information and photography available for such events.
This is part one of an ABC News special presentation.
You can also view part two: