Observatoire de Paris-PSL CNRS vopdc cdpp Sorbonne Université cnes Université de Paris LESIA

JSON Implementation of Time-Frequency Radio Catalogues: TFCat

Wednesday 12 March 2025, by Baptiste Cecconi

TFCat (Time-Frequency Catalogue) is a data interchange format based on JSON. It defines several types of JSON objects and the manner in which they are combined to represent data about time-frequency features of a time spectrogram (a.k.a. dynamic spectrum), their properties, and their temporal and spectral extents.

Link to document

TFCat Specification version 1.0

A up-to-date version is available online:
https://gitlab.obspm.fr/maser/catalogues/catalogue-format/-/blob/master/json/spec.md

Acknowledgements

The authors acknowledge support from PADC and LESIA.

BC, AL and MBT were also supported EPN2024-RI. The Europlanet 2024 Research Infrastructure (EPN2024-RI) project has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No 871149.

Contact

Any question or request should be addressed to contact.maser@obspm.fr

References

  • Bradner, S., “Key words for use in RFCs to Indicate Requirement Levels”, BCP 14, RFC 2119, DOI: 10.17487/RFC2119, March 1997.
  • Freed, N., Klensin, J., and T. Hansen, “Media Type Specifications and Registration Procedures”, BCP 13, RFC 6838, DOI: 10.17487/RFC6838, January 2013.
  • Bray, T., Ed., “The JavaScript Object Notation (JSON) Data Interchange Format”, RFC 7159, DOI: 10.17487/RFC7159, March 2014.
  • Bray, T., Ed., “The I-JSON Message Format”, RFC 7493, DOI: 10.17487/RFC7493, March 2015.
  • Butler, H., Ed., “The GeoJSON Format”, RFC 7946, https://datatracker.ietf.org/doc/html/rfc7946
  • Cecconi, B., Louis, C. K., Bonnin, X., Loh, A. & Taylor, M. B. (2022) Time-frequency catalogue: JSON implementation and python library. Front. Astron. Space Sci., vol 9. 10.3389/fspas.2022.1049677
  • Cecconi, B., M. Louys, A. Preite Martinez, S. Derrière, F. Ochsenbein, S. Erard, & M. Demleitner (2021). UCD1+ controlled vocabulary - Updated List of Terms Version 1.4. IVOA Endorsed Note. https://ivoa.net/documents/UCD1+/
  • Derriere, S., N. Gray, M. Demleitner, M. Louys, & F. Ochsenbein (2014). Units in the VO Version 1.0. IVOA Recommendation. DOI: 10.5479/ADS/bib/2014ivoa.spec.0523D, https://www.ivoa.net/documents/VOUnits/

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