The whole procedures of underwater digital terrain model (DTM) were presented by building with the global positioning system (GPS) aided high-resolution profile-scan sonar images.The algorithm regards the digital imag...The whole procedures of underwater digital terrain model (DTM) were presented by building with the global positioning system (GPS) aided high-resolution profile-scan sonar images.The algorithm regards the digital image scanned in a cycle as the raw data.First the label rings are detected with the improved Hough transform (HT) method and followed by curve-fitting for accurate location;then the most probable window for each ping is detected with weighted neighborhood gray-level co-occurrence matrix;and finally the DTM is built by integrating the GPS data with sonar data for 3D visualization.The case of an underwater trench for immersed tube road tunnel is illustrated.展开更多
The integration testing of 4K×4K Charge Coupled Device （CCD） detection system developed by researchers from the CAS Purple Mountain Observatory in cooperation with overseas coworkers was successfully carried ou...The integration testing of 4K×4K Charge Coupled Device （CCD） detection system developed by researchers from the CAS Purple Mountain Observatory in cooperation with overseas coworkers was successfully carried out for the Schmidt telescope at the Xuyi station in east China＇s Jiangsu Province recently.展开更多
文摘The whole procedures of underwater digital terrain model (DTM) were presented by building with the global positioning system (GPS) aided high-resolution profile-scan sonar images.The algorithm regards the digital image scanned in a cycle as the raw data.First the label rings are detected with the improved Hough transform (HT) method and followed by curve-fitting for accurate location;then the most probable window for each ping is detected with weighted neighborhood gray-level co-occurrence matrix;and finally the DTM is built by integrating the GPS data with sonar data for 3D visualization.The case of an underwater trench for immersed tube road tunnel is illustrated.
文摘The integration testing of 4K×4K Charge Coupled Device （CCD） detection system developed by researchers from the CAS Purple Mountain Observatory in cooperation with overseas coworkers was successfully carried out for the Schmidt telescope at the Xuyi station in east China＇s Jiangsu Province recently.
