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Optimization of the Use of Spherical Targets for Point Cloud Registration Using Monte Carlo Simulation

Journal of Geodesy and Geoinformation Science 2024年第2期7卷 18-36页

作者： CHAN Ting On XIAO Hang XIA Linyuan LICHTI Derek D LI Ming Ho DU Guoming School of Geography and Planning Sun Yat-sen UniversityGuangzhou 510275China Guangdong Provincial Key Laboratory of Urbanization and Geo-Simulation Sun Yat-sen UniversityGuangzhou 510275China Guangdong Provincial Engineering Research Center for Public Security and Disasters Sun Yat-sen UniversityGuangzhou 510275China Department of Geomatics Engineering Schulich School of EngineeringUniversity of CalgaryCalgary AB T2N 1N4Canada

Registrations based on the manual placement of spherical targets are still being employed by many professionals in the ***,the placement of those targets usually relies solely on personal experience without scientific evidence supported by numerical *** paper presents a comprehensive investigation,based on Monte Carlo simulation,into determining the optimal number and positions for efficient target placement in typical scenes consisting of a pair of *** demonstrates new check-up statistical rules and geometrical constraints that can effectively extract and analyze massive simulations of unregistered point clouds and their corresponding *** than 6×10^(7) sets of the registrations were simulated,whereas more than IOO registrations with real data were used to verify the results of *** results indicated that using five spherical targets is the best choice for the registration of a large typical registration site consisting of two vertical facades and a ground,when there is only a box set of spherical targets *** a result,the users can avoid placing extra targets to achieve insignificant improvements in registration *** results also suggest that the higher registration accuracy can be obtained when the ratio between the facade-to-target distance and target-to-scanner distance is approximately 3:***,the targets should be placed closer to the scanner rather than in the middle between the facades and the scanner,contradicting to the traditional thought. Besides,the results reveal that the accuracy can be increased by setting the largest projected triangular area of the targets to be large.

关键词： point cloud registration Monte Carlo simulation optimalization spherical target

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Optimazing operation and maintenance Telang II tidal reclamation scheme in relation to agricultural development

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Agricultural Sciences 2012年第2期3卷 287-298页

作者： Megawaty Robiyanto Hendro Susanto F. X. Suryadi Ngudiantoro Sriwijaya University Palembang Indonesia UNESCO-IHE Institute for Water Education Delft The Netherlands

The objective of this research is to study the hydraulic performance of the water management system of the Telang 2 tidal lowland reclamation scheme with respect to the operation and maintenance of the system. The hydraulic performance of the system should inline with the food crop water requirement and its cropping pattern. Based on the result of this research, a basic model will be set up in order to support a sustainable agricultural development in the area. The methodology of this research consists of 1) Analysing the hydraulic performance of the water management system for the existing condition as well as under the proposed scenarios;2) socio-economical approach to the related farmers in relation to the operation and maintenance of the water management system;3) Mathematical modelling of crop water requirement and an optimal water management system and its water management zoning system;4) Cost benefit analysis related to operation and maintenance of the water management system, role sharing and cost sharing. In this study, computer softwares CROPWAT, DUFLOW dan ArcGIS have been used as supporting tools in the analysis and evaluation. CROPWAT model was used for calculating the crop water requirement based on the climatological condition and proposed cropping pattern (rice-maize and rice-rice) and its calendar. Based on the result of the CROPWAT model, DUFLOW model was used in order to evaluate the capacity and hydraulic performance of the open canal system. Finally based on the field water layer condition, water management zoning can be derived by using ArcGIS in relation to the crop water requirement and required water levels in the water management system. Based on this research, it can be concluded that the cropping pattern rice-rice or rice-maize are preferable and the co sharing is 50% by the Government and 50% by the farmers is the best option and this is also inline with the hydro-topographical condition of the related area.

关键词： optimalization Water Management Tidal Lowland Reclamation Scheme Mathematical Modelling

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