provide reader for canSAS 2d (hdf5) format

[krzywon]

A file specification and sample data set would be useful for this. Could someone upload or link to either/both prior to CodeCamp? IV?

[smk78]

See ​http://cansas-org.github.io/canSAS2012/

[smk78]

I don't know what the current status of NXcansas is. PeteJ and Tobias are probably best-placed to comment, though Andrew may know?

However, is any application actually generating files in this format at present? I'm not aware of any that are.

[ajj]

Example datasets here:

​https://github.com/canSAS-org/canSAS2012/tree/master/examples/contributions

Use the ones at the top level there - they are converted NG3 magnetic field series

NXCansas is basically done but I struggle with the nexus repo. Tobias is going to send round something later this month.

[krzywon]

I have a reader that can load both 1D and 2D data sets, but only if they are in independent 'SASentry's. All SASdata objects are lumped into a single Data1D or Data2D object. I am already working on allowing for both 1D and 2D data within the same SASentry and should have that ready prior to the final 4.0 release.

[smk78]

The 'version 0' hdf cansas file I circulated the other month provoked quite a lot of discussion in the Data Format WG and generated several tweaks to the output. These are currently being worked into Mantid. I'll put out a revised file for testing when available.

[smk78]

The CanSAS Data Format Working Group has now 'approved' the latest version of the NXcanSAS hdf format. Examples of 1D and 2D files have been posted to ​https://github.com/canSAS-org/NXcanSAS_examples/tree/master/Mantid. They are the *_v3.h5 files. We should now support this format in SasView.

[krzywon]

My latest push can read in the v3 files in 1D and 2D format. I kept a few vestiges for the previous version to be sure there is backward compatibility with any existing data sets floating around.

[smk78]

Seems to work. Am closing the ticket.

[krzywon]

I'm glad to hear the reader works! I'm reopening this ticket as a reminder to myself to write unit tests.

[krzywon]

I refactored the Cansas HDF5 reader to allow any number of SASdata with a single SASentry and and number of SASentry within a single data file. Each SASdata object becomes its own Data1D/2D object and the reader allows for 1D and 2D data within the same SASentry.

I added two unit tests that can load in a data set with a single SASdata in a single SASentry and another that loads multiple of each.

[smk78]

Will you be doing the same for Cansas 1D XML files with multiple SASentry and SASdata?

[krzywon]

I'm working on it right now.