[NeXus-committee] DECTRIS example summary

[Wintersberger, Eugen]

Hi all
  Ok - if I got the entire discussion right the problem is to access
metadata for the different blocks as links are entirely transparent in
HDF5. In order to increase confusion let me make another proposal
(though I am not sure if someone has already made a suggestion like this
- I somehow lost track)

master file:
-----------
entry:NXentry/instrument:NXinstrument/detector_1 
....
entry:NXentry/instrument:NXinstrument/detector_n
entry:NXentry/data:NXdata/data_1 (link to data in detector_1)
...
entry:NXentry/data:NXdata/data_n (link to data in detector_n)
             
detector_i is a link to the detector group in the file for the i-th
image block

image block file:
----------------
entry:NXentry/instrument:NXinstrument/detector:NXdetector/data
                                                          first_image_nr
                                                          last_image_nr
entry:NXentry/data:NXdata/data (link to data in detector group)

To my opinion this approach has several advantages:
1.) because the detector group is linked to the master file all the
    detector related metadata can be accessed easily
2.) as the entire detector group is available the different image 
    blocks can be of different pixels size, geometry, or what ever
3.) I have it when detector data is not stored in an NXdetector group 
    along with the metadata. 

best regards 
  Eugen

On Mon, 2013-01-14 at 14:38 +0100, Mark Koennecke wrote: 
> Hi,
> 
> from your feedback and my own study I find that there are the following 
> problems
> with the example file as is:
> 
> - Structure is wrong regarding linked data sets. Should be either:
> 
>    * entry:NXentry/data_00001:NXdata/data (Preferred ....)
>    * entry:NXData/data:NXdata/data_0001
> 
> - On data, signal=1 attribute is missing
> - On external link, NeXus attribute 
> NAPIMOUNT=nxfile://th02c_ps02_1_data_000001.h5#data
>    missing
> - In detector, flatfield, efficiency data is missing. This is not critical,
>    I just wonder.
> 
> Am I right? Is this what I tell DECTRIS tomorrow? Or do I miss something?
> 
> Also, what is the opinion, do we need another Telco on this one?
> 
> Regards,
> 
>               Mark
> 
> 
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