Export 1D NxData as CSV

[loichuder]

Is your feature request related to a problem?

Scientists at ESRF beamlines often need to provide their users with ASCII data instead of HDF5 because the user software does not read HDF5.

Most of the time, the ASCII file should contain pyFAI integration data (ex: /entry_0000/1_integration/results in https://h5web.panosc.eu/h5grove) : one column for radial values, one for intensity and an optional one for errors.

Such an export can be easily done with a Python script but one needs to know the path of the data to export first, which requires exploration of the HDF5 file with an external tool (H5Web, silx, ...).

H5Web could bridge the gap here by providing exploration of HDF5 files and an automatic export to CSV within a single application. It would also mean that downloading the file would not be mandatory to export the data, making it very useful in remote viewing situations like the ESRF data portal.

Requested solution or feature

Have an Export as CSV button for the NXSpectrum vis. It should not be that difficult given that we already have similar export capabilities for other vis.

Alternatives you've considered

• Python script: requires prior knowledge of the data path and disk access to the file
• Dedicated GUI for HDF5 exploration and export: requires new development and disk access to the file

Additional context

Specific instance of #1619.

Loosely related to #1639 that I never got around to do 😞

[axelboc]

Duplicate of #1619? Don't mind keeping both opened, though.

We also talked about the fact that the getExportURL API might need a bit of a rethink: #1063 (comment)

[loichuder]

True, #1619 is almost the same... Forgot about it oops.