An essential capability of the Virtual Observatory is a means for describing
what data and computational facilities are available where, and once
identified, how to use them. The data themselves have associated metadata
(e.g., FITS keywords), and similarly we require metadata about data collections
and data services so that VO users can easily find information of interest.
Furthermore, such metadata are needed in order to manage distributed queries
efficiently; if a user is interested in finding x-ray images there is no point
in querying the HST archive, for example. In this document we suggest an
architecture for resource and service metadata and describe the relationship of
this architecture to emerging Web Services standards. We also define an initial
set of metadata concepts.
The SimDAL repository hosts numerical projects descriptions as standard XML documents following the Simulation Data Model serialization xsd. It allows clients to search (fulltext) for simulation projects or associated protocols of interest and get URIs towards other SimDAL components: SimDAL Search and SimDAL Data Access.
SAMP is a messaging protocol that enables astronomy software tools
to interoperate and communicate. IVOA members have recognised
that building a monolithic tool that attempts to fulfil all the
requirements of all users is impractical, and it is a better use of
our limited resources to enable individual tools to work together
better. One element of this is defining common file formats for the
exchange of data between different applications. Another important
component is a messaging system that enables the applications to
share data and take advantage of each other's functionality. SAMP
supports communication between applications on the desktop and in
web browsers, and is also intended to form a framework for more
general messaging requirements.
SkyBoT is a VO service which allows to seek and identify solar system objects (planet, satellites, asteroids, comets) in any field of view at a given epoch (cone-search method). It provides also a solar system object name resolver which convert the name or the designation of solar system objects into their celestial coordinates at a given epoch (resolver method). The SkyBoT service are available through a Web interface and a Web service (SOAP+WSDL+HTTP) which implements the IVOA Simple Cone-Search protocol.
SkyBoT is a VO service which allows to seek and identify solar system objects (planet, satellites, asteroids, comets) in any field of view at a given epoch (cone-search method). It provides also a solar system object name resolver which convert the name or the designation of solar system objects into their celestial coordinates at a given epoch (resolver method). The SkyBoT service are available through a Web interface and a Web service (SOAP+WSDL+HTTP) which implements the IVOA Simple Cone-Search protocol.
VO-compliant publication of Schmidt survey SRC-J of the southern sky digitized with the MAMA microdensitometer at the Observatoire de Paris Image Analysis Centre (CAI).
The main activity at Nançay is the development and application of new radio techniques to fundamental research in astrophysics and astronomy. A number of instruments are operated on behalf of researchers in France and worldwide to conduct scientific programmes of observation of the Universe, including the nearby Earth-Space environment, the study of the Sun and the solar system, and the study of distant stars and galaxies in the Universe.
Ultimately all types in a VO-DML model are defined as hierarchies
of primitive types. This Model defines a special, predefined model
that contains a set of the most common of such types: integer,
real, string etc. This
This document describes a recommended syntax for writing the string
representation of unit labels ("VOUnits"). In addition, it describes a
set of recognised and deprecated units, which is as far as possible
consistent with other relevant standards (BIPM, ISO/IEC and the IAU). The
intention is that units written to conform to this specification will
likely also be parsable by other well-known parsers. To this end, we
include machine-readable grammars for other units syntaxes.
