Find questions to "ask" dataset

[torhaugl]

What questions / queries do we want to ask the dataset of TEM images?

[torhaugl]

DCAT
Find all images created by someone with name "Tor S. Haugland".
Find all images created by someone with name "*Haugland*", where * is wildcard.
Find all images created in 2024.
Find all images that are downloadable.

[torhaugl]

TEM
Find all images with mag nm_per_pixel < 1.

[torhaugl]

Question: Is sample/alloy composition a dataset? What about temper/thermomechanical history?
If so,
TEM:
All images connected to sample 12345.
All images of composition <99% AL.
All images of AA6082.
All images with only natural ageing.

[torhaugl]

Can we add tags to images? If so,
TEM
All HAADF-STEM images
All 4D-STEM images

All images showing the Z-phase

[jesper-friis]

Question: What is the scalebar of the TEM image (expressed as the distance between pixels in nm in both x- and y-direction)?

This is information that can be extracted from the dm3 file. Hence, we need a declarative way to specify how this information should be extracted.

Proposed solution. In the json schema defining the requirements for a TEM dataset, we could also include information about a default value if the user hasn't provided it. In this case, we could refer to a mapping function that takes a dm3 file as input and returns the pixel distance along the x- and y-direction, respectively.

The benefit of using mapping functions, is that we already have a solution in tripper for declaring them. Furthermore, they can be reused for property mappings increasing code reuse.

[jesper-friis]

Question: What is the "theme" of my TEM image dataset?

The DCAT-AP-NO specification defines "theme" as mandatory. For a TEM image we already know the theme, which is "Transmission electron microscopy". Hence, the system should fill out this automatically if "theme" isn't provided by the user.

Proposed solution: Following the proposed solution in the question above, this would simply de a fixed default value in the json schema defining the requirements for a TEM dataset.