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The traditional method for visualization of 3D city models based on a "Layer-Object" does not consider the granularity differences in different data type and in different levels of detail, which results in the low transmission efficiency in the network environment and does not satisfy the need for smooth visualization with multi-user concurrent accesses. This paper analyzes the characteristics of an user experience including roaming over a wide range and focusing on small range, and proposes a method of using an index metadata to coordinate the organization and scheduling of model objects, which delivers instant responses to user requests, and at the same time, by decomposing model objects, decreases invalid data transmission. This paper describes the design of unified object ID structure to implicitly store the relationships of LoD models and decomposed objects to support distributed management. Finally, the validity and feasibility of this method are demonstrated through experiments on the platform of a distributed database MongoDB. [ABSTRACT FROM AUTHOR]

An integrated system scheme is proposed to realize uniform access of distributed and heterogeneous network resources. The scheme achieves virtual integration using Web Service,SRU and meta search technology, realizes service integration by OpenURL, and provides personalized service through constructing context-based knowledge base. The experimental result demonstrates that the scheme obtains effective integration of different kinds of resources and service, and one-stop access of the network resources and service realizes efficiently as well. [ABSTRACT FROM AUTHOR]