SSDM and GhoSST History

Since the initial idea emerging in 2002, the effective development of the GhoSST database concept started in 2006 (with the support of OSUG) with a "content demonstrator", called STSP (Spectroscopy and Thermodynamics of Solids of Planetary interests), which served to list and organize the content of the future database.

The definition of a first “solid spectroscopy” datamodel and the development of a technical demonstrator of the database infrastructure started in 2007 with the help of OSUG, CNES, ASOV and the PNP and PCMI programs.

But it is only after mid-2009 with the start of the two European programs Europlanet-RI (and its Planetology Virtual Observatory “IDIS”) and VAMDC (Virtual Atomic and Molecular Data Center) that the full developments of both SSDM (Solid Spectroscopy Data Model) and the spectroscopic part of the GhoSST database infrastructure have been possible.

SSDM data model

The Solid Spectroscopy Data Model (SSDM) allows a complete description of spectral data of solid materials. It includes a detailed description of the solid samples through their layers, their constituting materials, matters, constituents and species, but also gives all information on the instruments and techniques used for the measurements and on the recorded spectra and their products. It also describes the individual vibration bands of molecular solids (band list).

After a specification meeting of the "SSDM Expert working group" (January 2010) and almost 2 years of development, a first stable version of the core of SSDM (sample, atoms/molecules species, instruments, experiments and spectra) has been delivered (v0.3.4) following a review by the "SSDM Expert working group" (June 2011).

Several additional modules (chemical functions, mineral species and matters, publications, bands lists, bands and states) have been developed in the following version (v.04) and reviewed by the “SSDM Expert working group” (April 2012).

The current version implemented in the GhoSST database (v0.5.1) gets some major changes and improvements over the whole datamodel as well as a few additional modules (experimentalists, matter fluids and solutions, molecular modes parameters). This version is considered as the final stable version of the core of the datamodel and of the modules describing fundamental data (species, minerals, matters, publications, ...).

Additional modules are under development (meteorite matter, meteorite objects, complex organic matter, band parameters) to extend the current capabilities of the datamodel mostly to other types of solid samples.

SSDM is the foundation of the GhoSST database structure.

GhoSST interface

The GhoSST interface provides to the users several tools to search, explore, visualize and export data from the GhoSST database. It also provides to the data providers/managers a series of tools to search all data already in the database (by topics), to prepare, validate, and import new fundamental (species, matters, instruments, publications, ...), sample, spectral and bandlist data, and to correct and manage all these data.

A functional prototype (v0.3) based on SSDM v0.3.4 has been delivered and put online (restricted access to SSDM working group) since July 2011.

Many changes have been implemented since this date in order to follow the large changes and extension that occurred in the datamodel. Several new features have been added to facilitate the search, visualization of spectra and their related information, and their export.

The GhoSST web service (v0.5, beta version) has been opened to the public on September 25th 2012.

Additional developments are under way to extend the current capabilities of GhoSST. The major ones are:

  1. "band list" search, visualization and export tools (database already implemented) and their connection to the spectral database,
  2. additional export formats (VOTable, FITS, ...),
  3. specialized search on other types of solid samples (meteorites and complex organic matters).

GhoSST data, thanks to a VO interoperability layer we developed, can also be accessed through the VAMDC portal which give a common access to about 20 databases (mostly of gas) but with more limited search capabilities (mainly molecule, temperature, and band wavelength).