THE STUDY AND DESING OF GEO-SPATIAL METADATA MANAGING SYSTEM BASED ON USDI

摘要

Firstly, the paper presents the concepts of USDI and spatial metadata. Then after analyzing the existing spatial metadata managing systems, a mode of building distributed spatial metadata system is described and proposed according to the requirements of construction of USDI and our engineering practices. The system adopts XML as descriptions of metadata standard and three-layer B/S structure as basic framework to provide a more flexible and efficient query mechanism for distributed metadata repositories. Finally, the paper presents the design and realization of the spatial metadata managing system which introduces the total system design scheme and confirms its feasibility in the construction of USDI sharing and changing platform of "Digital Hefei".