libopenvlbi is an open source library and application suite for astronomical interferometry.
Interferometry is used as an observation technique to study the beam or stream interference and to obtain a coherence degree between more of them. A 2d interference plot of a single object observed from different locations (space domain flux projection plane dependent to the location of the receivers) shows the power distribution of the radiation pattern; from this plot we can obtain or extract the shape of the object observed.
libopenvlbi offers functions to applications that use it to make interferometry simpler and faster.
This website offers an online OpenVLBI JSON service.
The JSON API docs are still being written and will be available soon.
I encourage you to visit the github repository at https://github.com/iliaplatone/OpenVLBI or https://iliaplatone.github.io/OpenVLBI for futher information.