RIX MvA : WCS calibrations in IMG-N data products

[astronomyk]

https://jira.eso.org/browse/MET-2082

For METIS-6105 (IMG-N data products): The list of pipeline steps listed here do not include WCS calibrations. Is this also foreseen for N-band imaging data?

@ivh this is a throw back to the PIP Spec Doc. Would you like to comment?

[ivh]

@astronomyk I don't understand, why would I know anything about this?

[hugobuddel]

This RIX should not exist because it is for the DRLS which is not under review. It will probably not reach the "Submitted" stage. Similar for the other DRLS related ones. If we do get them, then simply answer that the DRLS is not under review. But politely, because we don't want to make it sound like we wasted the reviewers time.

[hugobuddel]

Ah, I understand. This is not about the DRLS, but about the PIP Specification

This is about https://polarion.astron.nl/polarion/#/project/METIS/workitem?id=METIS-6105 "IMG-N data products", which indeed does not list WCS calibration.

The LM-band counterpart https://polarion.astron.nl/polarion/#/project/METIS/workitem?id=METIS-6104 "IMG-LM data products" does list as a last step

world-coordinate system (WCS) based on telescope pointing and derotator position as well as static distortion map

I don't know the procedure for updating the PIP specification, and I don't really care at the moment. So I will answer the question without mentioning we will update the PIP spec.

Answered with

The pipeline for the N-band imaging data does indeed include WCS calibrations.

The relevant recipe is described in the Data Reduction Library Design (E-REP-AST-MET-1006 v1.0), section 6.3.6 "metis_n_img_distortion": "The distortion is described in terms of a polynomial model whose coefficients can be transformed to WCS keywords and applied to any other pipeline product."

[ivh]

Ah, I also misread this. I can update the item on Polarion.

Edit: ... and I answer Mario's comment in Jira.

[hugobuddel]

Thanks for doing the right thing @ivh and editing the PIP Spec.

In the meantime we confirmed with @Rumpelstil that a) the omission of WCS calibration was deliberate, and b) that decision has been reverted and it should indeed be included. See also #263

I suppose we can now close this, as https://polarion.astron.nl/polarion/#/project/METIS/workitem?id=METIS-6105 has indeed been updated. Or maybe we should first change the status from Draft to Ready for Internal Review?

[ivh]

Closing this since the AI is already carried out and closed on jira.