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 Require- ment 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., 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/