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| ¡¡ Map Data Network Dissemination System Based on
Metadata and CORBA Services Abstract£ºTaking advantage of some characteristics of spatial map data (SMD)£¬ such
as mass data£¬ multiª²scales£¬ universality£¬ and discrete distribution that is
suitable to be processed in the network environment with distributive£¬ sharing£¬ selfª²adaptive£¬
heterogeneous and scalable features£¬ a map data network dissemination (MDND)system for
disseminating SMD to remote users is presented£® Firstly£¬ SMD£¬ the associated
metadata and the network resource nodes described as a graphic form are defined£® The
relations between SMD and network resources are established£® After giving formulized
definition to MDND£¬ SMD dissemination framework and series of services based on CORBA£¬
the input methods are provided according to the three query conditions of metadata£® MDND
is implemented on the basis of metadata set inquiry service and routeª²pointed service of
geographic information£® Comparision in the modes of CORBA service£¬ FTP and direct copy
shows that the proposed system can effectively achieve SMD dissemination£¬ its transfer
performance in CORBA service mode is equivalent to the direct copy£¬ better than FTP£¬
and it approaches to the biggest transfer rate more quickly with weak dependence on data
amount£® |
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