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Water Transportation Information Monitoring
Water transport is a major trunk transportation form mainly in charge of massive-loading and long-distance freight shipping. It is a cost-effective way of large-quantity and long-distance delivery. However, traditional investigation methods cannot meet its requirements, with a low visibility range and difficulties in detecting the underwater rocks and reefs. Therefore, all-aspect information of channels and coastal lines is in urgent need.
A Brand-New Ssolution
Remote Sensing (RS) technology, large-scale in coverage, quick in response and capable of cycled monitoring, has been extensively applied in water transport survey. The Simao section of the Nuozhadu Hydropower Station along the main stream of the Lancang River is taken as the demonstration of how the Jilin-1 satellite RS imagery extracted information of channels and coastal lines.
Imagery collected by the Optical Star A of the Jilin-1 constellation is adopted for the data extraction. It has a resolution superior to 1 meter, three multi-spectral bands of R, G, B, simulative near-infrared wave band and a Digital Elevation Model (DEM) whose grim precision is superior to 10 m.
Satellite images of the Lancang River are combined with the DEM data to interpret the boundary, elevation and gradient of water bodies. Information of the Simao section of the Nuozhadu Hydropower Station including the coastal line and water boundaries is extracted after analyzing the spectral, geometrical and elemental traits of the images.
The water transport information the Simao section of the Nuozhadu Hydropower Station is extracted:
(1) The channel between the Nuozhadu Hydropower Station and the Simao port is 22.59kilometers in length.
(2) The total coverage of the water area from the downstream of the Station to the main stream of the Simao port is 4.36 square kilometers.
(3) The average width of the Lancang River channel at the Simao port is 190 meters, ranging between 700 m and 50 m.
(4) The road facilities are improved around the Nuozhadu-Simao section with an average width of 12 meters.
(5) There are two-lane highways of about 7-9-meter wide on average on both sides of the Langcang River, connecting villages and towns.