Engineering Research Center for Software and Applications

Wuhan, China

Engineering Research Center for Software and Applications

Wuhan, China

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Lu J.-J.,Wuhan University | Lu J.-J.,Engineering Research Center for Software and Applications | Lu J.-J.,Wuhan Zondycyber Co. | Lin W.-H.,Wuhan University | And 5 more authors.
Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences | Year: 2010

To solve the problem about function configuration, scalability and multi-tenancy efficiency based on the geographic information system (GIS) fourth level model of "Software as a Service" architecture, the model architecture for GIS service engine of configurable function is presented. And the kernel technologies including work flow, function warehouse, configuration, right management for GIS service engine of function configuration are introduced. Then remote image application system is constructed based on the technology of GIS service engine of function configuration, and it provides technical support for the new application model of software as a service.


Zhou S.-P.,Wuhan University | Zhou S.-P.,Engineering Research Center for Software and Applications | Hu M.-S.,Wuhan University | Hu M.-S.,Engineering Research Center for Software and Applications | Fang F.,Wuhan University
Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences | Year: 2010

As spatial data center technology is increasingly well developed and highly sophisticated, the land resource management area is in bad need of a new model of distributed geographic information system (GIS) applications, which is featured by the integrated management and utilization of spatial data. In addition, much has to be worked out soon in the areas such spatial data integration and comprehensive use, incremental updates, as well as software functions sharing and cooperative development of different manufacturers. In this paper, based on the spatial data center technology, and by introducing the distributed heterogeneous spatial data seamless integration technology, a concept model called seamless spatial data center is established, and the technology is discussed.


Wu X.-C.,Wuhan University | Wu X.-C.,Engineering Research Center for Software and Applications
Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences | Year: 2010

To fully integrate various urban information resources and effectively consolidate business applications of all urban departments, the foundation information supporting platform is established to meet the need of building information foundation platform for digital city, which can manage various urban information resources effectively and provide various applications and services. The integration development platform for digital is realized by the MapGIS data center technology of data warehouse, function warehouse, building up secondary development. And the platform can provide a unified application and service system for all kinds of urban business and realize network-based social services and sharing various urban information resources. Then it can maximize the economic and social benefits of urban information resources in China.


Wan B.,Wuhan University | Wan B.,Engineering Research Center for Software and Applications | Yang L.,Wuhan University | Yang L.,Engineering Research Center for Software and Applications
Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences | Year: 2010

More and more organizations and departments need collaboration of geographic information function to complete work. The key is component reuse and collaboration in geographic information system (GIS) area. This paper adopts the component framework based on black box reuse, discusses the key technologies of function warehouse. Firstly, multi granularity component structure is presented, including atom granularity, function component, function plug-in and function flow; Secondly, uniform function protocol is defined for unified management and release, unified configuration and system building on heterogeneous function resources. Through unified protocol, running service can discover and call function resource dynamically and achieve the function resource position and parameter transfer. Function warehouse can integrate various types of function resources, implement the uniform management and call in data center, and finally achieve collaboration of geographic information function with workflow engine and visual model building tools.


Wang H.-P.,Wuhan University | Wang H.-P.,Engineering Research Center for Software and Applications | Liu X.-G.,Wuhan University | Liu X.-G.,Engineering Research Center for Software and Applications | And 4 more authors.
Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences | Year: 2010

Optimizing the RPC (Rational Polynomial Coefficient) model can improve the positioning accuracy of the RPC correction model. Tacking an IRS-P5 image for example, in the cases of using 0-9 control points or using compensation model, we analyze the accuracy change of the image ortho correction. The results show that the accuracy can be improved from 55.80 m to 5.80 m when we increase the control points from 0 to 1; while the accuracy is close to 5.0 m when the number of control points is more than 5; In addition, the accuracy reach 4.0 m when we use 1 control point and compensation model. It indicates that the accuracy of ortho correction of RPC modal can substantially increase by adding control points, also can reach high correction accuracy using compensation model in the cases of missing control point.


Xu Z.-Y.,Wuhan University | Xu Z.-Y.,Engineering Research Center for Software and Applications | Wu X.-C.,Wuhan University | Wu X.-C.,Engineering Research Center for Software and Applications
Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences | Year: 2010

Due to rapid development of intelligent terminals and Internet, the mobile spatial information services becomes an important part of Digital City and Digital Earth, and the kinds of embedded geographic information system (GIS) based on positioning and navigation become the main form of the services. This paper analyzes the characteristics of modern spatial information services, with hierarchical modular design method. The modules, such as portable GIS-based abstraction layer, multiple data storage model, electronic map display engine and high-performance applications service engine is introduced. A portable embedded GIS platform is designed, which provides a practical solution for popular application development of mobile spatial information service.


Gao W.,Wuhan University | Gao W.,Engineering Research Center for Software and Applications | Liu X.-G.,Wuhan University | Liu X.-G.,Engineering Research Center for Software and Applications | And 4 more authors.
Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences | Year: 2010

Fractal net evolution approach (FNEA) is a relatively mature one among the object-oriented image segmentation algorithms, but its efficiency is to be improved. Quad-Tree segmentation is a kind of effective image segmentation method. In this paper, an improved object oriented multi-scale image segmentation method based on the quad-tree pre-segmentation and FNEA is introduced. The experiment shows that the effect of its segmentation result is almost the same as that of traditional FNEA method. Moreover, it saves time.


Chen Z.-L.,Wuhan University | Chen Z.-L.,Engineering Research Center for Software and Applications | Wu X.-C.,Wuhan University | Xie Z.,Wuhan University | And 2 more authors.
Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences | Year: 2010

In order to improve the efficiency of parallel processing of a spatial mass data under the distributed parallel computing grid environment, this paper presents a new grid slot hash parallel spatial index GSHR-Tree structure established with the parallel spatial indexing mechanism. Based on the hash table and dynamic spatial slot, we have improved the structure of the classical parallel R-tree index. The GSHR-Tree index makes full use of the good qualities of R-Tree and hash data structure. A new parallel spatial index is constructed to meet the needs of parallel grid computing about the magnanimous spatial data in the distributed network. This arithmetic splits space into multi-slots by multiplying and reverting and maps these slots to sites in distributed and parallel system. Each site constructs the spatial objects in its spatial slot into an R-tree. On the basis of this tree structure, the index data is distributed among multiple nodes in the grid networks by using large node R-tree method. Instead of spatial object's recursive comparison where original R-tree has been used, the algorithm builds the spatial index by applying binary code operation in which computer runs more efficiently, and extends dynamic hash code for bit comparison, using the system response time of the parallel processing of spatial scope query algorithm as the performance evaluation factor. The result of the simulated the experiments shows GSHR-Tree is performed to prove the reasonable design and the high performance of the indexing structure presented in the paper.


Wan L.,Wuhan University | Wan L.,Engineering Research Center for Software and Applications | Xie Z.,Wuhan University | Xie Z.,Engineering Research Center for Software and Applications | And 2 more authors.
Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences | Year: 2013

Most of existing spatial information grid systems can not meet the demands of complex spatial business process modeling and cooperative process of computing tasks for lack of effective organization and management of computing resources. Based on the GIS architecture with data/function separation, we put forward a novel spatial information grid service workflow model based on service function composition using activity network graph method. This model provides a flexible construction mechanism to build different spatial information services and achieves dynamic migration of these service resources using assembly and disassembly, dynamic aggregation mechanisms of service functions. It offers a solution for the challenges of unified organization of computing resources, resource distributions according to need and parallel task processing in grid environment. Based on the model, the overall framework of spatial information grid workflow cluster is proposed, which is featured with automatic load balance and dynamic resource allocation. The research results mentioned above have been successfully applied to metallogenic prediction in China geological survey information grid. It realizes a workflow-based processing mode for complex spatial information applications and greatly improves the processing efficiency of spatial information system in a grid environment.

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