Application of the LDM Software to Meteorological Data Exchange

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 Organization (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.