Design and Implementation of Metadata Management in the National Earthquake Network

Due to the large numbers of units and organizations in earthquake precursor industry, there exist some problems as follows: a) how to dynamically manage the relationships among different units; b) how to synchronize the metadata from lower unit to upper unit in a quick way; c) how to manage the metadata restriction in distributed system. Based on the current situation, the demand for earthquake precursor industry, and the analysis of existing metadata management programs, we first proposed a novel metadata management model –DAC (Dynamic Automatic Constraints) Model, which considerate all the property of metadata in this system, i.e. diversity, distribution and restriction. Then we design and implement the metadata management system for earthquake precursor industry by DAC model. Experiments show that our system meets the demand and is appropriate for applications in the practical environment.