SPCDIS User Annotation Use Case 3

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Short Description:

In this use case, a user requests clarification on the description of a process used in the provenance of an image, and receives an response clarifying the original description. In turn, the clarification becomes applicable to alternate references of that process (i.e. from provenance traces for other data products).

Scenario:

Here, a user Alice is looking at the provenance trace for a given solar intensity image. She is unclear what the purpose of the “Flatten” process is, and pulls up a definition provided by MLSO:

Create flat field from the collection of individual LSD and bias files. chip_prep has copied the latest ones into the flat-input directory. Trim the number used to the latest from the past week.

After reading this, Alice has additional questions related to the terminology provided in the definition. In particular, she is not sure what a bias file is. She makes a request for the definition of a bias file, which links to the original MLSO definition.

To satisfy Alice’s request, an alternate user Carol (not affiliated with ACOS) takes the following steps:

  1. Creating a semantic data object to represent a definition of a bias file, with the following text: In digital photography, a bias frame is an image obtained from an opto-electronic image sensor, with no actual exposure time. The image so obtained only contains noise due to the electronics that elaborate the sensor data, and not noise from charge accumulation (e.g. from dark current) within the sensor itself.
  1. Establishing a link from this new definition object to Alice’s request.


Scenario Aftermath:

For any future users (including Alice) looking at the “Flatten” process (and corresponding execution instances), two description entries will be available:


Create flat field from the collection of individual LSD and bias files. chip_prep has copied the latest ones into the flat-input directory. Trim the number used to the latest from the past week.

- Asserted by the MLSO development team

In digital photography, a bias frame is an image obtained from an opto-electronic image sensor, with no actual exposure time. The image so obtained only contains noise due to the electronics that elaborate the sensor data, and not noise from charge accumulation (e.g. from dark current) within the sensor itself.

- Asserted by Carol, based on the request made by Alice