Japanese Virtual Observatory Project

Abstract : The National Astronomical Observatory of Japan (NAOJ) started the Japanese Virtual Observatory (JVO) project since April 2002. JVO utilizes the Grid technology to combine several remote 　 computational resources. We have defined the query language for the JVO to federate multiple astronomical databases and constructed a prototype of the JVO to confirm whether federated databases can be accessed through Grid technology. More information is available at:

Masatoshi OHISHI, Yoshihiko MIZUMOTO, Naoki YASUDA, Yuji SHIRASAKI, Masahiro TANAKA, Satoshi HONDA (NAOJ) and Yoshifumi MASUNAGA (Ochanomizu Univ. and NAOJ) in Collaboration with Fujitsu Ltd.

Contact Address: adac@jvo.nao.ac.jp

Road Map

http://jvo.nao.ac.jp/http://jvo.nao.ac.jp/

Design for Prototype II

JVO Prototype Ver 1. Main Control Window

Write JVO QL here or use an editor.

Open a JVO QL Editor

User’s ownservice

User’s ownservice

Security mngmt Security mngmt Resource mngmt Resource mngmt

MVC

MVC

MVC

JVOPortalJVO

Portal

Astronomical CatalogQuery Service

Astronomical CatalogQuery Service

　　 Globus Toolkit

Catalog DB

ServiceRegistryServiceRegistry

Researcher

Browser for JVOBrowser for JVO

Viewerfor JVOViewerfor JVO

Data ArchiveService

Data ArchiveService

Data manage DB

DataVirtual Observationexecution service

Virtual Observationexecution service

Data Analysisservice

Data Analysisservice

ServiceRegistryServiceRegistry

Other VO servicesOther VO services

Other Catalogservices

Other Catalogservices

　　 Globus Toolkit

JVO GRID EnvironmentOther GRID Environment

UDDI server

WebBrowser

WebブラウザServices callablethrough Grid

GlobusToolkit V2

Data managementData management

Security mngmt Security mngmt Resource mngmt Resource mngmt Data managementData management

At the beginning, researchers provide the JVO with simple instructions how they plan to use their own ''Virtual Observation''. The JVO portal interprets them and generates a work flow through consulting the UDDI servers, where available JVO services are registered. Based on the work flow, built-in or user-defined services are called. The GRID framework is used for dynamical assignment of distributed resources according to their availabilities. Execution results of the work flow are transferred through GridFTP and presented to the researchers.

Three-Tiered Design of the JVO Prototype I

The first version of JVO prototype has been completed. The design of the JVO prototype is shown as a schematic diagram. We adopted to use the Globus Toolkit 2 for our prototype. However, we also take into account the Web Service concept which is included in the Globus Toolkit 3.

A main control window provides you to specify a query in JVO Query Language. You can save/load the QL in a file with the Export/Import button. A QL editor is opened by pushing the editor button and provides an easy way to specify search conditions.

The JVO system splits the user input query into pieces of queries for each database, then issues search commands to appropriate servers through a “globus-job-submit” command of Globus Toolkit.

This example shows a demo doing a cross-matching search between the two databases SDF-i’ and SDF-z’. At first a search command is issued to the SDF-i’ database server, mizu-g, then the result is transferred to the SDF-z’ database server, minazuki-g, where cross-matching search is executed. Image requests are issued at the last two steps.The query results are transferred through GridFTP in a VOTable format for table data and in FITS for image data.

The query result is shown up in a result page, which is a kind of VOTable viewer and provides an easy access to both the table and image data. For graphical viewing of the table data, plotting tool is available. You can specify any column or expression for X/Y axis.

Column attributes are displayed by pushing the “column_info” button, where you can also control the column layout.

We are designing the JVO prototype II, which is an extension of the prototype I and incorporates functions required in the practical system. Followings will be newly implemented or improved on the prototype II:

2001 2002 2003 2004 2005 2006 .JVO project start Development

of Prototype IDevelopment of Prototype II

Development of Practical Systems

Experimental service start

1. Adoption of Globus Toolkit 3 (OGSA),

2. User management,

3. Simple user interface for making a query, showing the result, and so on..,

4. Federation of the distributed DBs,

5. Integrated data analysis services.

The current JVO prototype can communicates with four distributed database, “Subaru Deep Field i’-band” (SDF-i’), SDF-z’, “Subaru XMM Deep Survey” (SXDS), and 2MASS.

Linux

X match

データ検索処理

データ数 count

PostgreSQL

画像管理　　 DB

WSDL

データベースサーバ２

SUBARUSupCam i-band

Globus Toolkit V3

OGSA-DAI

Analysis services

Query request

Gb Ether

Solaris8

Web Browser

User operation Window

Windows,Solaris8, Linux

Globus Toolkit V3

Make schedule I

JVO-QL parse server

Portal Server

Solaris8

X match

Distributed Resource manager

OGSA-DAI

DAISGR

Results Window

Search criteria Window

・ Search DAISGR・ Parse GWDSL・ Preparation, Execute・ Confirmation of results

Web Server

Make schedule II

Data query services

Globus Toolkit V3

Data number count

PostgreSQL

Image management DB

Linux

Data query services

Data number count

ORACLE

Image management　 DB

Security Manager

Resource Manager

Globus Tk

Portal servlet

GWSDL

WSDL

Data base server N

Data Base server 1

SUBARUSupCam z-band

2MASS

Query request

Registry search

Query Results

Status monitor Window

Status monitor

Registry

User management

Status display

Data storage

Globus Toolkit V3

OGSA-DAI

Globus Toolkit V3

OGSA-DAI

Analysis services

Query request

GT3 userdata

User DB server

Linux

Analysis services

Analysis server

Gb Ether

Analysis request

Federation

of distribute

d D

Bs

Distributed processing control