Review of Meteorological Data Sharing Project in China

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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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Background
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
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Background

• CMA have done three works
• Develop the sharing strategy and technical
  standards,
• Integrate the data resources,
• Construct the service system.

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Sharing Strategies and Technical Standards

• In order to standardize the works of
  meteorological data sharing, we have developed a
  series of standards and regulations which include
  two aspects
• sharing strategies
• technical standards about data management

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sharing strategies
Law and Policy

• Meteorological Laws of the People's Republic of
  China
• No.40 Resolution of WMO
• Measures for Meteorological Data Sharing (issued
  by CMA)

Strategies for sharing
Principle Sharing data based on Classification
and Grading

• Draft of Classification and Grading of Shared
  Meteorological Data
• Draft of Classification and Grading of
  Meteorological Data Users

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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
  metadata dictionary
• Define
• Metadata Entity
• Database ID, QC, Time, Coverage, KeyWords,
  Format, Restriction, 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

• Entity of data
• Metadata file
• Documentation file

A dataset
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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
Meteorological Observations
CMA have built several kinds of meteorol. Obs.
Networks from 1949 surface upper-air
satellite radar baseline atmosphere acid
rain agro-meteorol.
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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 dataset
• Global upper-air weather dataset
• China surface climate dataset
• China upper-air climate dataset
• China radiation climate dataset

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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.

BeiJing
Before
After

• Monthly Temperature dataset (1951-2003)

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Datasets Development

• 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

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Data Service system
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.
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Data Service system
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DMZ
INTERNET
Web Service Servers
????
????
Fire Wall
???
Switches
DataBase Server 2
DataBase Server 1
Monitor Server
Appl. Server
Balance Server
I/O Server
Computers
SAN Switches

Tapes for Archive
Disk Array
Tape library
Structure of MDSS (NMIC)
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Disk Array Tape Library
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http//data.cma.gov.cn
Sharing Service Web Sites
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Data Service system
Distributed networks ----Unified platforms
Unified Metadatas Unified data classification and
naming Unified user recognization
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Data Services
Online Services (from Jan. 2002Dec. 2005)
(http//cdc.cma.gov.cn)
Registered users gt600 Web visitors 260,000 Data
Downloadedmore than 4,800 GB
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Data Services
Offline Services (from National Meteorological
Archives)
From Jan. 2002Dec. 2005, more than 2,700
persons visited the reception centre and got data
600GB totally.
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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!