Remote sensing is an earth observation technique. It is the acquisition of the measurements of objects on the Earth¡¦s surface using data acquired from aircrafts and satellites. It includes the electromagnetic radiation analysis and interpretation of measurements that the instrument is not in contact with the target.

Remote Sensing (RS)

Flood refers to the water, which exists in normally dry areas where they later become wet temporarily. In Australia, it had been estimated to be the most costly type of natural disaster, with an average loss of 300 million AUD per year.

Flood

Coastal flood refers to the fresh sea water mainly from the sea.
Inland flood refers to the flood occurred within inland areas away from the sea. In general, inland flood allows more time for us to prepare as the inland flood flow path can be predicted while coastal flood is instant.

Coastal flood vs inland flood

Flood usually affects the lands, which is from the overflow of inland, tidal waters and runoff of surface from any sources, including heavy rains Tsunamis, dam failures and earthquakes.

Causes of flood

 

Backgrounds

Impacts of flood

 

Remote sensing is a valuable tool for monitoring floods. It only requires relatively low usage of human factors and resources. It allows the differentiation between non-inundated and inundated areas with microwave sensors, which can penetrate through cloud and work regardless of solar accesses and rainy seasons.

Why do we choose remote sensing for flood mapping?

University of New South Wales

Integrated Remote Sensing For Flood Mapping

Flood mapping is a technique, which utilises several different methods, includes remote sensing to map out the flood extent after natural flood hazards. It is a core crucial and efficient component in response to all the flood operations. It helps to generate flood hazard maps and flood risk maps, which demonstrate the expected floodwater extents and depths, with potential risks to the flooded areas.

What is flood mapping?

Positive impacts

Negative impacts

Maintain key ecosystem and biodiversity Recharge the groundwater systems Fill the wetlands Enhance the connectivity between aquatic habitats Move sediment and nutrients into marine environment Increase fish production

Loss of human lives Damage to properties Destruction of crops Loss of livestock Damaged to communication links and infrastructure Disrupt normal life and tourism Affect food price and production Decrease in food production Impact downstream water quality Loss of inland habitat Dispersal of weed species Release of pollutants