# PZ LOR: A Summary of the Submissions

**URL:** <https://www.rubin.community/t/pz-lor-a-summary-of-the-submissions/6307>\
**Category:** Photometric Redshifts\
**Tags:** photoz\
**Created:** [February 8, 2022, 6:29pm UTC](https://www.rubin.community/t/pz-lor-a-summary-of-the-submissions/6307 "2022-02-08T18:29:12Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![MelissaGraham](https://sea2.discourse-cdn.com/flex002/user_avatar/www.rubin.community/melissagraham/32/2549_2.png) [@MelissaGraham](https://www.rubin.community/u/MelissaGraham)\
**Post date:** [February 8, 2022, 6:29pm UTC](https://www.rubin.community/t/pz-lor-a-summary-of-the-submissions/6307/1 "2022-02-08T18:29:12Z")

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**The Rubin Observatory Data Management (DM) team sincerely thanks everyone who engaged with the PZ LOR process.**

In total, there were 20 submissions: 19 LOR and 1 “non-LOR” describing DESC’s photo-z activities.

Of the 19 LOR, 12 advocated for particular algorithms, 6 presented scientific use cases, and 1 was a notification of future software development (deep probabilistic networks).

Of the 12 LOR advocating for particular algorithms:

- 4 were machine-learning (ML) based codes (GPz; DEmP; PZFlow; DNF)
- 3 were template-fitting (TF) based codes (LePhare; Phosphoros, BPZ)
- 2 were hybrid ML+TF codes (Delight, ML-accelerated hierarchical SPS models)
- 3 were for codes which performed “post-processing” to enhance PZ estimates
  - e.g., combine PZ estimates, recalibrate PDFs, refine outlier flags

[Read more about these 12 LOR and DM’s shortlist](http://www.rubin.community/t/pz-lor-a-summary-of-the-proposed-pz-estimators-dm-shortlist/6308).

Of the 6 LOR describing scientific use cases:

- 1 focused on galaxies
- 2 focused on dark energy
- 3 focused on active galactic nuclei

[Read more about the scientific use cases](http://www.rubin.community/t/pz-lor-a-summary-of-the-scientific-recommendations-with-dm-responses/6309).

The “Roadmap to Photometric Redshifts for the LSST Object Catalog“, [DMTN-049](https://dmtn-049.lsst.io/), has been updated to include the community input provided via the PZ LOR and a look forward to Rubin Commissioning and the Photo-z Validation Cooperative.

[Read more about commissioning and the Photo-z Validation Cooperative](http://www.rubin.community/t/rubin-commissioning-and-the-photo-z-validation-cooperative/6310).

As always, questions about any of the above are welcome and encouraged to be posted as new topics in the “[Science - Photometric Redshifts](http://www.rubin.community/c/sci/photoz/42)” category of the Rubin Community Forum.