Research On The Topographic Map Production And Three-Dimensional Reconstruction Techniques Based On The Earthquake-Stricken Area By Uav Remote Sensing

UAV Remote Sensing system (UAVRS) has the characteristics of low cost,flexible,easy to carry and suitable for high-risk areas surveys,an effective complement to manned aircraft airborne remote sensing and satellite remote sensing,with a wide range of market development prospects in disaster emergency. UAVRS can fly without a dedicated track.UAVRS can effectively avoid the interference of clouds and bad weather.UAVRS can obtain high image resolution and work flexibility. UAVRS has a unique advantage to compare to manned aircraft airborne remote sensing and satellite remote sensing.This article uses the reconstruction village of the5.12Wenchuan earthquake disaster area as pilot area and summarizes the key technologies of quickly access to UAVRS information and studies the way of four fast splicing with UAV images and describs accurate disaster information in earthquake disaster area with UAVRS technology. This parer produces orthophoto map and the DEM of the earthquake-stricken areas, discussing production of large-scale topographic maps with the UAV, exploring the use of UAVRS images to create three-dimensional topographic map and on display through computer systems.The main research of content and innovative as follows:1) The pater introducts the rapid assessment of the UAV image quality from such as parameters pre-set, image overlap, route curvature and the difference of flight height And introducts the UAV image preprocessing from such as Eliminate the clouds, uniform color, distortion error correction and resampling.2) Study on the image of the splicing method based on rapid splicing UAV panoramic image, POS data and SIFT algorithm. The pater Improves method by the SIFT algorithm computing step analysis and saves a lot of computing time through the improvement of the algorithm. The preparation of the related software with Visual C#2008achieves the UAV images automatically stitching based on SIFT algorithm.3) By the UAVRS experiment in the earthquake area, we access to the disaster area of UAV image data.The data processing and error analysis show the feasibility of UAV production1:2000scale topographic maps. The paper analysis the differences of the UAV production of large scale topographic maps and other mapping methods in adaptability, efficiency, accuracy and cost,describing the method of large scale topographic maps produced in the earthquake area and the production of large-scale topographic map test.4) Elaborating the step of producing three-dimensional landscape of the earthquake disaster area with UAVRS images and produced a three-dimensional landscape plan for earthquake-stricken areas. The three-dimensional landscape plan has high resolution and vivid image. Through the preparation of three-dimensional landscape display system,the system has the capabilities of browsing, query and analysis obout the three-dimensional landscape of theearthquake-stricken areas.