Web services at TERAPIX



We present an implementation of V.O.-compliant web services built around software tools developed at the TERAPIX centre. These services allow to operate from a remote site several pipeline tasks dedicated to astronomical data processing on the TERAPIX cluster, including the forthcoming EFIGI morphological analysis tool.

Download full-text


Available from: Anthony Baillard, Nov 03, 2014
78 Reads
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: The Japanese Virtual Observatory (JVO) aims to provide astronomers to access federated astronomical databases (especially SUBARU, Nobeyama and ALMA) and data analysis environment by using the grid technology. We defined a unified query language to access federated astronomical databases, the JVOQL, and constructed a prototype of the JVO. We adopted Globus Tool Kit 2 (GTK2) in this prototype to see its effectiveness in VO type application, especially for remote operations and file transfers, and UDDI for looking up services. We found that the system worked as we had expected, however, it took very long to initiate each grid process. Thus we replaced the GTK2 with a tool distributed by NSF middleware initiative, and shortened the polling intervals of the job-manager from 30 seconds to 3 seconds. As a result, the serious problem has been partially resolved - the elapsed time for a query became about a half compared with the previous one.
    Applications and the Internet Workshops, 2004. SAINT 2004 Workshops. 2004 International Symposium on; 02/2004
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: We propose an automatic system to classify images of galaxies with varying resolution. Morphologically typing galaxies is a difficult task in particular for distant galaxies convolved by a point-spread function and suffering from a poor signal-to-noise ratio. In the context of the first phase of the project EFIGI (extraction of the idealized shapes of galaxies in imagery), we present the three steps of our software: cleaning, dimensionality reduction and supervised learning. We present preliminary results derived from a subset of 774 galaxies from the Principal Galaxies Catalog and compare them to human classifications made by astronomers. We use g-band images from the Sloan Digital Sky Survey. Finally, we discuss future improvements which we intend to implement before releasing our tool to the community.
    06/2006; 351:236.
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: I report on the software development effort involved in the TERAPIX project. TERAPIX is essentially dedicated to the processing of MEGACAM data; however, TERAPIX software modules are designed for a broader use, and provide the necessary tools to reduce most CCD imaging surveys. The TERAPIX tasks include automatic pre-reduction, image calibrations, resampling, co-addition and source extraction. I describe our technical choices, as well as the main software features and performance.
    01/2002; 281:228.