How to load a raw timestream from a session ID

[samdayweiss]

Hi All!

For a novice on sotodolib: Does anyone have a code example of how to access a raw timestream (including converting to pA) from a session ID?

Thanks!

[jlashner]

Hi sam! If you have the stream-id and the session-id, you can use the load_session function in sodetlib.stream to load an axis manager. This is loaded into the base sodetlib package, so you can do something like:

import sodetlib as sdl

stream_id = <stream_id>
session_id = <session_id>
am = sdl.load_session(stream_id, session_id)

If the data has already been transferred and you are running this on a server that's not the smurf-server, you need to set the base directory where the timestreams are saved, and pass that in as the base_dir kwarg. For example:

am = sdl.load_session(stream_id, session_id, base_dir='/mnt/so1/data/ucsd-sat1/timestreams')

If you have a G3tSmurf database setup, there are other ways that we use to interact with archival data, which are documented here. Hope this helps!

[samdayweiss]

If the data is from noise.take_noise(), it seems to only have a session ID and no stream ID, will that function still work?

[jlashner]

If you have the result from take_noise, then the stream_id should be saved in res['meta']['stream_id']. (This is true for all sodetlib data products)