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Grid Based Chinese Virtual Observatory System Design
Chenzhou CUI, Yongheng ZHAO
National Astronomical Observatories, Chinese Academy of Sciences
Chinese Virtual Observatory (China-VO) project is
a consortium initiated by Chinese National
Astronomical Observatory (NAOC) and Large Sky
Area Multi-Object Fiber Spectroscopic Telescope
(LAMOST) project.
China-VO Service Model
MyVO
• Personal VO services
• Modular Design
• Structured Design
Client services from different providers if only
with stardard interface can be intergrated into
the China-VO MyVO.
Mission
Being a key component of the International Virtual
Observatory, completes its part in China, and
leads astronomy research in China into VO era.
Spectra Data Related Applications
Characteristics of the China-VO
Data processing and analyzing tools for
astronomers.
• Open Grid Services Architecture (OGSA) based
architecture
• Service oriented R&D mode
• VO-enabled LAMOST
• Application services focusing on spectral sky
survey data automatic processing and
analyzing
China-VO Architecture
Service-oriented mode will be adopted during the
R&D of the China-VO. Server-side components of
the system act as three roles, data service
provider (DSP), application service provider (ASP)
and Registry. Functions of the three roles are
implemented by series of atomic VO services, a
kind of Grid service. Some functions, for example
resource management, system monitoring,
security and job schedule are required by all of
the three roles. These common services will be
taken from Globus Toolkit and other Grid
middlewares. Common services for both
astronomy and other scientific fields, for example
visualization and data mining, China-VO will refer
to successful solutions of other fields, while
concentrate itself on astronomical characterized
fundamental and application services, for
example registry, astronomy ontology, data
transform, data processing, etc.
VO-enabled LAMOST
Grid technology, especially the OGSA and its
implementation Globus Toolkit 3 (GT3), aims to
remove the "isolated islands" of information on the
Internet, and to enable dynamic sharing of all
kinds of network resources. OGSA provides a
solid technical platform for the China-VO. The
system architecture of the China-VO is strongly
based on that. The China-VO will adopt serviceoriented mode during its R&D. Logically, the
system is composed of four layers, i.e. fabric layer,
resource layer, collective layer and user layer.
Fabric layer is the resource base for the whole
system. Taking advantage of GT3 and other Grid
components, resource layer provides unified
resource access for higher services. Collective
layer is collection of astronomical characterized
services, including data processing, data mining,
analyzing, visualization, computing, etc. User
layer is the interface between the China-VO and
users; Its basic functions are job submission and
results return.
The task consists of two stages: VO-enabled
LAMOST Data and VO-enabled LAMOST
Telescope. At present, we are only
concentrating on the first stage by defining IVO
compatible resource metadata, data model and
data access services.
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Data processing
Spectrum measurement
Spectra redshift calculation
Automatic classification
Outlier detections
Cross-identifications
Data Mining
Visualization
High Performance Computing
Build on atomic services and can take
advantages of existing packages.
China-VO & Partners
• China-VO: NAOC, Yunnan Astronomical
Observatory NAOC (YNAO), Peking University
(PKU), Tsinghua University (THU), University of
Science and Technology of China (USTC), etc.
• Chinese National Grid (CNGrid): high
preference computing, bandwidth resource,
storage resource, large-scale Grid testbed.
• IVO: Standardization, Interoperation
What’s meaning?
• Working catalogs, including target catalog and
guide star catalog, are extracted using multiwaveband sky survey datasets federated
through the IVO.
• Data production, including 2-d and 1-d spectra
data and survey catalog, generated by
LAMOST pipeline, are integrated into the IVO.
Email: [email protected]; [email protected]
Homepage: http://www.china-vo.org, http://www.lamost.org
National Astronomical Observatories, Chinese Academy of Sciences
China-VO milestones
 2002-2003, China-VO prototype at NAOC
 2004-2005, Beijing city area China-VO
 2006-2007, National wide China-VO