Laurent Lerusse - from Grenouille to Polar Bears
Managing metadata and data capture for the Astra-Gemini 0.5 PW laser
Astra-Gemini is part of CLF
STFC - -Science & Tech Facilities Council
Grid-enabling information resource that follows a project from proposal to experiment to analysis, results and publication .. driven by central metadata store.
CLF data flow - ELk + DAQ + PolarBear(metadata) -> NeXus Writer
PolarBear needs to know the whole laser light path for the experiment and all the detectors that will be generating data.
Learnt:
- defining complex systems not easy with xml - but can be done
- scientists not used to editing raw xml - tools need to be provided!
- recording metada is time consuming but pays dividends
- evolution not revolution - continuous beta
Q? why not semantic language .. A:unfamiliarity
Q? how do you have surity that the physical world is as described by the metadata, given that all equip isnt fully tagged eg barcodes etc? .. A: that is difficult.
Q? how do you capture experiential knowledge .. this is what ELk is there for but it still has to be used, which is optional A: provision of the capability is essential
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