Research On Construction Method Of 3D Geographic Entity Model Of Rural Land

With the continuous development of computer technology and surveying and mapping science and technology as well as the national strategy of natural resources management,the application of geographic information data in various fields has put forward more diversified demands.Since the rural revitalization strategy was put forward,the application research of village planning and other fields has been extensively explored,and the information construction of villages and towns has been gradually paid attention to,and people’s demand for village land resources is also increasing.However,in the current process of village construction,there is a poor correlation between the data of multiple departments related to village land,and it is difficult to correlate the spatial data of village land with the thematic business data,which hinders the joint analysis and application of village land data.At the same time,the current description of rural land data mostly adopts the traditional two-dimensional form,which lacks the efficient three-dimensional expression of rural land.Therefore,it is a hot research topic to study the association organization and three-dimensional efficient expression method of rural land data in order to meet the application needs of rural land planning.According to the above problem,this paper puts forward the rural land three-dimensional geographic entity model building method,on the basis of geographical entity related research to realize rural land space,attributes,relationships,and the data the overall description of the project business,three-dimensional geographic entities and build rural land database to complete the integration organization and management of rural land data.At the same time,based on the constrained triangulation network,the integrated representation of rural land 3d geographical entities is realized,and the efficiency of 3d representation of model data is improved by using and improving model scheduling and model rendering methods.Based on the actual project,the method in this paper is put into practice and verified by developing application system.The main research contents and achievements of this paper are as follows:(1)The data organization method of three dimensional geographic entity of village land is designed.According to the characteristics of village land,combining with the theory and technology of geographical entity,the classification system of three-dimensional geographical entity of village land is constructed,and the data model of three-dimensional geographical entity of village land is designed on this basis.Establishing rural land at the same time based on grid subdivision three-dimensional geographic entity encoding,the multi-scale spatial data and attribute data of rural land and a variety of special data,and the construction of rural land three-dimensional geographic entity database to realize the integration of rural land data organization and management,at the same time,the 3 d for the village land efficiently express lay the foundation.(2)The expression method of village land 3d geographic entity model is designed.In view of the differences of geometric characteristics of different types of geographical entities in the classification system of three-dimensional geographical entities of village and town land,a variety of spatial data models were used to express the three-dimensional geographical entities of village and town land,and the model integration was realized based on constrained triangulation network.At the same time,LOD dynamic hierarchical scheduling,model preloading,view-elimination algorithm and instantiation rendering technologies are used to improve the efficiency of model data in network transmission and client rendering,so as to achieve efficient three-dimensional representation of rural land and improve user experience.(3)Application system design and implementation.Based on the method in this paper and the actual project,a 3d geographical entity model expression system of rural land was designed and implemented.The method in this paper was applied in practice,and the scientificity and feasibility of the method in this paper were verified through experiments.