Precision Comparison Of3D Reconstruction Based On3D Laser Scanning Date And Close Shot Photogrammetic Date

As the latest technology of surveying and mapping field, terrestrial3D laserscanning and close range photogrammetry are able to obtain the raw survey data quickly,completely with high precision, reconstruct scanning physical, completely changed thetraditional single-point measurement. For the rapid development of two technologies,this paper described their latest research at home and abroad, and detailed introductionof the terrestrial3D scanning and close-range photogrammetry syetems, focusing on thekey technologies and important theory in experimental process and data processing.As a high-technology in surveying and mapping field,3D laser scanning has theadvantages of high efficiency and high precision, however, it acquires data still relativedto the instrument coordinate system. In this paper, the aim of experiment is to getmulti-station scanning data of Fengshanzhen’s high-slope, simultaneously survey thespace retangular coordinates of targets with none cooperation target total station.Through nonlinear least squares algorithm in MATLAB, the paper completed Big EulerAngle coordinate transformation from scanner coordinate system to space coordinatesystem. According to the difference between the two kinds of coordinates, it get thepoint error approximately, and obtain transformation precision which researched±0.0183m. It is learned that this method is applicable to coordinate transformation,accurately extracting the target center from the point cloud and accurately surveyingtarget center with total station is the key to achieve the coordinate transformationaccurately.Based on rotating multi-baseline crossing photogrammetry, this paper obtained thecorresponding image data with professional photogrammetric camera in the same regionof scanning, which has good observing condition. Process the image data throughlensphoto system, obtain±0.0174m of point bit precision after the adjustment, andgenerate a good TIN landscape of mountain cliffs. The result show that themulti-baseline close-range photogrammetry technology has the advantages of highprecision measurement, combined with fast, high efficiency and high of automation, canbe well applied to the creation of3D model of the irregular shape, and can be used asthe main technology of deformation monitoring.