【摘 要】
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Located in Huairou District of Beijing,the Huanghuacheng Underwater Great Wall was constructed in the Ming dynasty,dating back over 600 years of history.Due to the construction of the reservoirs and d
【机 构】
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Center for Earth Observation and Digital Earth,Chinese Academy of Sciences,China
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Located in Huairou District of Beijing,the Huanghuacheng Underwater Great Wall was constructed in the Ming dynasty,dating back over 600 years of history.Due to the construction of the reservoirs and dam in 1970s,the bottom part of the wall submerged under water and flood,thus a strange section of underwater Great Wall relic formed.After immersion in water for nearly 50 years,the status of the underwater section has not been investigated in detail due to technical limitations.Fortunately,with the use of RC-S2 Survey Remote Controlled Boat,current topography status of the underwater wall was obtained by sonar.After comparison with the spatial location of the Great Wall ruins on the shore,current height and orientation of underwater Great Wall relic were obtained.The 3D model of the underwater Great Wall was established based on these parameters,laying technical foundation for the following archaeological discoveries of underwater ruins.The results showed that: (1) The RC-S2 survey boat is able to collect bathymetric data at a 500ms sampling interval,and the sounding resolution can be up to the centimeter level.(2) The specific location of the underwater Great Wall can be clearly distinguished from the high-precision DEM produced by depth data,and it was consistent with the result of field verification,proving the reliability of the data collected by RC-S2.(3) The real underwater Great Wall scene can be represented by DEM and remote sensing images,combing with 3D model techniques.The successful application of RC-S2 in the underwater Great Wall area opened up new prospects for wide range investigations of underwater ruins with high precision.
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