[Objective] The aim was to explore the measurement of coordinate parameter by multi-baseline digital close-range photogrammetry system.[Method] The 3-dimensional coordinate of 8-year-old Jujube was measured by using Lensphoto multi-baseline digital close-range photogrammetry system,and through comparing with measured data of Total Station,the error and accuracy of photogrammetry data were analyzed.[Result] The absolute error of X,Y and Z coordinate was 0-0.014,0-0.018 and 0-0.004 m respectively,and the relative error of X,Y and Z coordinate was less than 0.145%.The significance test of pairs for the photogrammetry data and measured data of Total Station indicated that the space coordinate data of stumpage were accurately measured by using the multi-baseline digital close-range photogrammetry method,and the photogrammetry data meet the need of space coordinate measurement for virtual plant growth simulation.[Conclusion] This study had provided theoretical basis for the growth measurement of virtual plant growth simulation.
Based on the measurement principle of multi-baseline digital close-range photogrammetry system,this paper proposed method of gain forest measurement factors by this system. Through comparing research of the statistical results in photogrammetry data of stumpage and measured data of total station,the result indicates that people may gain more reliable data by multi-baseline digital close-range photogrammetry system,accurately monitor forest and meet the need of forest measurement by this system. At the same time,by establishing three-dimension point cloud model based on 3-D model of tree,people may expediently gain forest measurement factors which shall be harder by traditional methods.
