[Nexus] beam spectrum in NeXus

[Aaron Brewster]

Ok, so I think I like the following the best:

incident_wavelength: the derived 'best' wavelength from the spectra (array
of length N where N is number of images)
incident_wavelength_original: original spectra.  array of dimension NxM
where M is number of energies in the spectra.
    @variant: incident_wavelength
incident_wavelength_original_weight: original spectra weights. NxM

So, does incident_wavelength_original_weight need a variant tag?  Note
saying it is a variant of incident_wavelength_weight doesn't make sense
since incident_wavelength_weight isn't specified (not available since it's
a wavelength per shot).  Or is it assumed it follows the X_weight
convention that we talked about at the last meeting?

Thanks,
-Aaron

On Thu, Apr 2, 2020 at 1:06 PM Aaron Brewster <asbrewster at lbl.gov> wrote:

> Good tips folks, thanks.  I'll think about it some more and update you
> when I lock something in.
>
> On Thu, Apr 2, 2020 at 12:28 AM Watts Benjamin (PSI) <
> benjamin.watts at psi.ch> wrote:
>
>> Hi Aaron,
>>
>>    Another interpretation is that the calculated wavelength is a refined
>> version of the spectrum. Therefore, you could use the "variants" feature we
>> were just discussing. It is a more interesting case, however, since the
>> refined value is a different type/shape as the older value, but it is also
>> just as valid for the intended field.
>>
>>
>> Cheers,
>>
>> Ben
>> ------------------------------
>> *From:* NeXus <nexus-bounces at shadow.nd.rl.ac.uk> on behalf of V. Armando
>> Sole <sole at esrf.fr>
>> *Sent:* Wednesday, 1 April 2020 11:24:04 PM
>> *To:* Discussion forum for the NeXus data format
>> *Cc:* Discussion forum for the NeXus data format
>> *Subject:* Re: [Nexus] beam spectrum in NeXus
>>
>> On 01.04.2020 23:13, Aaron Brewster wrote:
>> >
>> >        * Add a new optional field to NXmx:
>> incident_wavelength_calculated.
>> >
>>
>> That one.
>>
>> The others are the measured stuff that any software could use to
>> calculate whatever calculated_wavelength to be used. If you have already
>> calculated it, then you can add it.
>>
>> If you are sure about the calculated being the correct one, then use it
>> instead of the foreseen one and create anything to store the raw stuff
>> (for instance incident_wavelength_original)
>>
>> Armando
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