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Singapore to use 3D map for flood prediction

Singapore: PUB, Singapore’s National Water Agency could be using a better flood-prediction computer model in the near future. It will include a 3D land-height map of just the Marina catchment area for a start, to predict the direction in which rainwater will flow at ground level during storms, and where flooding might occur.
The Marina catchment area makes up a sixth of Singapore and has been hit by floods in recent years. It includes Orchard Road, which has been hit by floods recently.
The terrain will be captured in 3-D for the map through a technique known as ground-based light detection and ranging (LiDAR) and GPS-fitted vehicles.
According to experts, this technique produces the map faster and cheaper than manual land surveys can, but it suffers in urban areas, where tall buildings may interfere with the GPS signals. The pulses may also bounce off cars and pedestrians, distorting the land-height information.
Such a map, which the PUB has commissioned, will depict land height in that area to within 10cm accuracy. PUB called for proposals for the land-height map last month and is reviewing the submissions.
Recently, a panel of drainage specialists appointed by the Singapore Government to tackle the flood problem recommended a national map. But, PUB spokesperson stated that it will focus on the Marina area first.
According to PUB’s tender document for the map, the work will cover some 100km of roads in low-lying and flood-prone areas of the zone. The agency said it came up with the requirement that the map show the lay of the land to within 10cm accuracy by examining floods, which run between 5cm and 30cm deep.
Source: www.thejakartaglobe.com