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Review of Meteorological Data Sharing Project in China. Anyuan XIONG (National Meteorological Information Center, CMA, CHINA). OUTLINE. Background Sharing strategies and concerning technical standards Datasets Development Data-sharing System Data Services. Background. - PowerPoint PPT Presentation
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Review of Meteorological Data Sharing Project in China
Anyuan XIONG
(National Meteorological Information Center, CMA, CHINA)
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OUTLINE
Background
Sharing strategies and concerning technical standards
Datasets Development
Data-sharing System
Data Services
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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?
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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
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CMA have done three works:
Develop the sharing strategy and technical standards,Integrate the data resources, Construct the service system.
Background
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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
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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
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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
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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 m
etadata dictionary
Define: Metadata Entity Database :ID, QC, Time, Coverage, KeyWords, Format, Restrictio
n, Distribution……(attributes)
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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.
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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
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Datasets Development
How to transform the meteorological observations into the shareable products is the most important works in data sharing project.
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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
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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.
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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 datasetGlobal upper-air weather datasetChina surface climate datasetChina upper-air climate datasetChina radiation climate dataset
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Datasets Development
Homogeneity Test and Adjust: Because of station relocating, sensor changin
g, obs. Time altering,….,there are lots of inhomogeneities in the Climatic Series.
To test and adjust these inhomogeneous Climatic Series.
Monthly Temperature dataset (1951-2003)
BeiJing Before After
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Serv
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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
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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
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Data Service system
卫星中心科技大楼INTERNE
T
DMZWeb ServiceServers
Fire Wall
Tape library
骨干网
Disk Array
…
SAN Switches
DataBase Server 1
MonitorServer
Appl.
Server
Switches
Tapes for Archive
Balance Server
I/O Server
Structure of MDSS (NMIC)
DataBase Server 2
Computers
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Disk Array & Tape Library
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Sharing Service Web Sites http://data.cma.gov.cn
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Unified MetadatasUnified data classification and namingUnified user recognization
Data Service system
Distributed networks:
----Unified platforms
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Registered users : >600Web visitors : 260,000Data Downloaded : more than 4,800 GB
Data Services
Online Services (from Jan. 2002—Dec. 2005):
(http://cdc.cma.gov.cn)
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Data Services
From Jan. 2002—Dec. 2005,more than 2,700 personsvisited the reception centreand got data 600GB totally.
Offline Services (from National Meteorological Archives)
2003 1 -2004 3年 月 年 月用户领域分布图
56%26%
10%5%
3%
0%
气象机构科研教育政府部门及事业单位部队其他
2003 1 -2004 3年 月 年 月共享服务访问人次统计图
0
10
20
30
40
1月 3月 5月 7月 9月 11月 1月 3月
月份
人次
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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.
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THANKS!
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