Review of Meteorological Data Sharing Project in China Anyuan XIONG (National Meteorological Information Center, CMA, CHINA)

Meteorological Data Services OUTLINE Background Sharing strategies and concerning technical standards Datasets Development Data-sharing System Data Services

Meteorological Data Services Background 1. Meteorological data is one of the most widely used data. 2. ISSUEs: The notion about data service Great amount of data produces continuously ----How to manage it? A less amount of shareable data ----How to develop shareable products? A low capacity to share the data ----How to effectively make the data available?

Meteorological Data Services In December 2001, under the support of the MOST, CMA Startup the project “Meteorological Data Sharing” to increase the capability of meteorological data sharing service from 2001 to present. Xiangshan scientific conference Background

Meteorological Data Services CMA have done three works: Develop the sharing strategy and technical standards, Integrate the data resources, Construct the service system. Background

Meteorological Data Services In order to standardize the works of meteorological data sharing, we have developed a series of standards and regulations which include two aspects: 1.sharing strategies 2.technical standards about data management Sharing Strategies and Technical Standards

Meteorological Data Services sharing strategies Meteorological Laws of the People's Republic of China No.40 Resolution of WMO Measures for Meteorological Data Sharing (issued by CMA) Law and Policy Strategies for sharing Draft of Classification and Grading of Shared Meteorological Data Draft of Classification and Grading of Meteorological Data Users Principle: Sharing data based on Classification and Grading

Meteorological Data Services Standards and Regulations for DM Metadata Standards of Meteorological Datasets Classification, Coding and Naming Rules of Meteorological Datasets Criterion of Making and Archiving Meteorological Datasets Description Composing Rules of Meteorological Datasets

Meteorological Data Services Standards and Regulations for DM Metadata Standards of Meteorological Datasets with references of : WMO Core Metadata ISO Geography information metadata standard (ISO 19115) Chinese sustainable development information core metadata dictionary Define: Metadata Entity Database : ID, QC, Time, Coverage, KeyWords, Format, Restriction, Distribution……(attributes)

Meteorological Data Services Standards and Regulations for DM Classification, Coding and Naming Rules of Meteorological Datasets Based on all kinds of attributes of Meteorological data, using line and area classifying method, the meteorological data can be classified 14 classes. The rules also define the regulations of coding and naming database and its files.

Meteorological Data Services Standards and Regulations for DM Criterion of Making and Archiving Meteorological Datasets Description Composing Rules of Meteorological Datasets A dataset  Entity of data  Metadata file  Documentation file

Meteorological Data Services Datasets Development How to transform the meteorological observations into the shareable products is the most important works in data sharing project.

Meteorological Data Services Datasets Development CMA have built several kinds of meteorol. Obs. Networks from 1949 — surface — upper-air — satellite — radar — baseline atmosphere — acid rain — agro-meteorol. — …… Meteorological Observations

Meteorological Data Services Datasets Development Issues: Historical data are recorded in different medias with different formats. Much of data is not digitized. There are a lot of quality problems with historical data which should be tested and adjusted.

Meteorological Data Services Datasets Development QC Schemes: Quality Control Procedure for surface observations. Quality Control Procedure for upper-air observations. Quality Control Procedure for radiation observation. Global surface weather dataset Global upper-air weather dataset China surface climate dataset China upper-air climate dataset China radiation climate dataset

Meteorological Data Services Datasets Development Homogeneity Test and Adjust: Because of station relocating, sensor changing, obs. Time altering,….,there are lots of inhomogeneities in the Climatic Series. To test and adjust these inhomogeneous Climatic Series. Monthly Temperature dataset ( ) BeiJingBeforeAfter

Meteorological Data Services In recent 5 years, we have developed 105 Data sets, totally more than 1000GB, 13 different types Surface data upper-air data Radiation data Oceanic Meteorol. data Satellite Meteorol. data scientific experiments data …… Datasets Development

Meteorological Data Services China Meteorological Data Sharing Service Platform is a distributed sharing service system, which be jointly constituted by elementary data service web site, and six provincial data service web sites, at present. Data Service system

Meteorological Data Services Data Service system

卫星中心 科技大楼 INTERNE T DMZ Web Service Servers Fire Wall Tape library 骨干网 Disk Array … SAN Switches DataBase Server 1 Monitor Server Appl. Server Switches Tapes for Archive Balance Server I/O Server Structure of MDSS (NMIC) DataBase Server 2 Computers

Meteorological Data Services Disk Array & Tape Library

Meteorological Data Services Sharing Service Web Sites

Meteorological Data Services Unified Metadatas Unified data classification and naming Unified user recognization Data Service system Distributed networks: ----Unified platforms

Meteorological Data Services Registered users ： >600 Web visitors ： 260,000 Data Downloaded ： more than 4,800 GB Data Services Online Services (from Jan. 2002—Dec. 2005): (

Meteorological Data Services Data Services From Jan. 2002—Dec. 2005, more than 2,700 persons visited the reception centre and got data 600GB totally. Offline Services (from National Meteorological Archives)

Meteorological Data Services Data Services In addition, there are 21 provincial meteorological bureaus to set up their own data sharing platform on internet and afford data sharing services.

Meteorological Data Services THANKS!