LDM软件在气象数据交换中的应用

Application of the LDM Software to Meteorological Data Exchange

目前运行的国内气象通信系统存在着交换平台(操作系统平台)不统一、数据接口不统一、数据交换软件不统一等问题,导致每新增一类投人业务使用的观测资料,从资料采集、资料传输、资料传输监视到资料应用等都自成一体,给通信传输管理带来很大不便。LDM(Local Data Manager)软件作为底层通信传输和管理系统,可实现上述三者的统一。通过对目前国内气象通信系统存在的传输软件不统一、文件数目多时造成拥塞和文件优先级无法保证问题的分析,对LDM软件灵活和有效的数据分发功能及用户可配置的、支持分布式的处理和事件驱动的特点进行了介绍,并以建立的基于LDM的实时气象资料分发服务系统为研究和试验原型,对LDM软件及目前国内气象通信系统软件进行对比分析,结果表明:采用LDM软件可以提高传输业务的整体工作质量,解决目前国内气象通信系统存在的问题,即LDM软件较适用于我国气象数据交换业务。

Multiform meteorological data exchange platform with different data interface and exchanging software are used around the country,adding the inconvenience and inconsistency of communication management, data acquisition,data transmission,data monitoring when a new kind of data are applied to operational work.The Unidata Local Data Manager（LDM） is a collection of cooperating programs that select, capture,manage,and distribute arbitrary data products.The system is designed for event-driven data distribution, which means any data put into the data product queue can be processed as quickly as possible. The LDM system is widely used in some developed countries.All the operational radar data of America are transferred to National Weather Service（NWS） by LDM.It is also used in the World Meteorological Or-ganization （WMO） THORPEX Interactive Grand Global Ensemble（TIGGE） project to transfer data among the data centers. In order to validate the applicability in civil meteorological data communication,a series of research and experiment are carried out,and Real-time Meteorological Data Distribution Service System Based on LDM is built in Henan.Using the LDM system,every new observation data and the data of Project 9210 are transferred reliably,so the data transfer program can be integrated.LDM is designed as event-driven which can process data files with multithreading,so it can resolve the congestion and ensure priority.The implementation of LDM program improves the transfer quality,resolves the problem of inconsistency,and ensures priority when much more files are processed.Workloads of operators on duty can also be reduced when monitoring data communication.The LDM system has good prospect in civil meteorological data exchange.