Opsim and MAF Metrics Lynne Jones Opsim and MAF metrics Call for - - PowerPoint PPT Presentation

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Opsim and MAF Metrics Lynne Jones Opsim and MAF metrics Call for - - PowerPoint PPT Presentation

Jul 12, 2023 293 likes •473 views

Opsim and MAF Metrics Lynne Jones Opsim and MAF metrics Call for white papers on LSST survey strategy The call - https://ls.st/c66 White papers need method to evaluate survey strategy effectiveness for specific science goal: metrics (MAF

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Opsim and MAF Metrics

Lynne Jones

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Opsim and MAF metrics

Call for white papers on LSST survey strategy

  • The call - https://ls.st/c66
  • White papers need method to evaluate survey strategy effectiveness for

specific science goal: metrics (MAF metrics)

  • For moving objects, this generally requires a step beyond simulating

survey strategy (Opsim output): need to simulate observations of a population of small bodies

  • Then can evaluate metrics, based on those observations
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OpSim, sims_movingObjects, & MAF

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Operations Simulation (OpSim) generates simulated pointing histories under realistic conditions. (Scheduler in OpSim will be the LSST scheduler). sims_movingObjects takes a set of

  • rbits and generates the observations

LSST would acquire MAF analyzes these observations and applies a “metric” to all observations of the same object. (MAF can clone obs/orbit over range of H values).

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Example: Discovery / Completeness

Step 1 - opsim (survey strategy)

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  • A particular survey strategy results in a simulated pointing history

(generated with OpSim - LSST scheduler)

Sample subset of columns from Opsim output database

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Example: Discovery / Completeness

Step 2 - generate moving object observations (sims_movingObjects)

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  • Given a set of orbital parameters, sims_movingObjects can generate
  • bservations of those objects

Sample subset of columns from sims_movingObjects output observation file

Documentation (temporary home): http://ls.st/5kj

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Example: Discovery / Completeness

Step 3 - MAF metric

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  • MAF metric evaluates chance of discovery (per orbit, assuming a particular

H value — or range of H values).

  • MAF metric only has to deal with evaluating X after being handed the
  • bservations for a given orbit, at a given H value
  • Metric output is saved; can then be summarized and visualized across

different axes

  • Discovery chance as a function of orbital parameters (at a given H value)
  • Discovery chance as a function of H value (taking median/mean/etc

across orbital parameters of the population)

  • For something like discovery: also can summarize as completeness

across population as a function of H

Documentation: https://sims-maf.lsst.io/

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Analysis (different populations, baseline survey strategy)

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Example: Discovery / Completeness

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White Paper Runs

Name Description

baseline2018a

Baseline Project-official baseline (official opsim v4 baseline, 6/2018). No dome crawl.

kraken_2026

Next baseline Unofficial baseline (expected next baseline, including dome crawl). Comparison point for WP run simulations.

colossus_2665

Bigger baseline Baseline style, with slightly expanded WFD footprint to better satisfy SRD constraints on fO

colossus_2664

No GP No separated Galactic Plane proposal. Simply run WFD over galactic plane region.

colossus_2667

Single visits Survey with single visits only. Standard visits in pairs each night replaced with single visits per night.

pontus_2489

Short visits Survey with more visits. Standard 2x15s visits replaced with 1x20s in grizy and 1x40s in u band.

kraken_2042

No snaps Survey without snaps (single 30s exposures per visit).

kraken_2035

9 DDF Survey with 9 DD mini surveys instead of 5. Addition of 4 extra extragalactic DD fields.

mothra_2045

Rolling (2) A rolling cadence in WFD. Two regions of declination, alternating on/off every other year throughout entire survey.

pontus_2502

Rolling (2) A rolling cadence in WFD. Two regions of declination, alternating on/off every other year throughout the entire survey, but the background WFD remains "on" at a 25% reward level.

kraken_2036

Rolling (3) A rolling cadence in WFD. Three regions of declination, alernating on/off every third year from years 3-8. Standard WFD coverage in years 1-2, 8-10 (first two and last two years).

pontus_2002

PS style Very large WFD footprint (24,700 sq deg) and 5 DD mini-surveys (5 fields). ("PS style").

kraken_2044

PS - Single visits Very large WFD footprint (24,700 sq deg) and 5 DD mini-surveys (5 fields) ["PS style"] but with single visits per night.

mothra_2049

PS - Rolling (2) A rolling cadence on a very large WFD footprint (24,700 sq deg). Two regions of declination, alternating on/off every other year throughout entire survey.

nexus_2097

PS - Rolling (3) A rolling cadence on a very large WFD footprint (24,700 sq deg). Three regions of declination, alternating on/off every third year from years 3-8. Full WFD coverage in years 1-2, 8-10 (first and last two years).

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Analysis (many runs)

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Example: Discovery / Completeness

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Analysis (many runs)

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Example: Discovery / Completeness

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Analysis (many runs)

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Example: Discovery / Completeness

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Analysis (many runs) - Tools to evaluate effect of varying survey strategy

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Example: Discovery / Completeness

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(what’s up with the single visits run? colossus_2667)

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Example: Discovery / Completeness

This is all due to field overlaps! Run was configured for single visits per night. Note that amount of overlap will depend on field tessellation and visit sequence.

Fewer chances for discovery, but still have capability NVisits per night, including overlaps NVisits per night, without overlaps

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White Paper Runs

Name Description

baseline2018a

Baseline Project-official baseline (official opsim v4 baseline, 6/2018). No dome crawl.

kraken_2026

Next baseline Unofficial baseline (expected next baseline, including dome crawl). Comparison point for WP run simulations.

colossus_2665

Bigger baseline Baseline style, with slightly expanded WFD footprint to better satisfy SRD constraints on fO

colossus_2664

No GP No separated Galactic Plane proposal. Simply run WFD over galactic plane region.

colossus_2667

Single visits Survey with single visits only. Standard visits in pairs each night replaced with single visits per night.

pontus_2489

Short visits Survey with more visits. Standard 2x15s visits replaced with 1x20s in grizy and 1x40s in u band.

kraken_2042

No snaps Survey without snaps (single 30s exposures per visit).

kraken_2035

9 DDF Survey with 9 DD mini surveys instead of 5. Addition of 4 extra extragalactic DD fields.

mothra_2045

Rolling (2) A rolling cadence in WFD. Two regions of declination, alternating on/off every other year throughout entire survey.

pontus_2502

Rolling (2) A rolling cadence in WFD. Two regions of declination, alternating on/off every other year throughout the entire survey, but the background WFD remains "on" at a 25% reward level.

kraken_2036

Rolling (3) A rolling cadence in WFD. Three regions of declination, alernating on/off every third year from years 3-8. Standard WFD coverage in years 1-2, 8-10 (first two and last two years).

pontus_2002

PS style Very large WFD footprint (24,700 sq deg) and 5 DD mini-surveys (5 fields). ("PS style").

kraken_2044

PS - Single visits Very large WFD footprint (24,700 sq deg) and 5 DD mini-surveys (5 fields) ["PS style"] but with single visits per night.

mothra_2049

PS - Rolling (2) A rolling cadence on a very large WFD footprint (24,700 sq deg). Two regions of declination, alternating on/off every other year throughout entire survey.

nexus_2097

PS - Rolling (3) A rolling cadence on a very large WFD footprint (24,700 sq deg). Three regions of declination, alternating on/off every third year from years 3-8. Full WFD coverage in years 1-2, 8-10 (first and last two years).

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LSST Survey Strategy Survey Strategy must be defined with input from the community.

  • LSST Call for White Papers on Survey Strategy: http://ls.st/c66
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Survey strategy can be improved beyond current reference but there are open questions as to how. Snaps (2x15 or 1x30)? WFD cadence? NES footprint & cadence? Pairs in same or different filters? No pairs at all? New mini surveys for other purposes? WHITE PAPERS UNDERWAY Contact Meg / LSST-SSSC

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Resources/Links

  • Call for white papers http://ls.st/c66
  • Questions/discussions about call/white papers/etc: community forum
  • https://community.lsst.org/c/sci/survey-strategy
  • Standard MAF outputs http://astro-lsst-01.astro.washington.edu:8080/
  • Moving Object Metrics (NEO, MBA, TNO) to be added shortly
  • Comparisons between MAF outputs http://ls.st/blm
  • Moving Object Metrics (NEO, MBA, TNO) to be added shortly
  • opsim documentation https://lsst-sims.github.io/sims_ocs/
  • sims_movingObjects documentation http://ls.st/5kj
  • sims_maf (MAF) documentation https://sims-maf.lsst.io/
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Call issued

Jan 2018 April 2018 June 2018 Aug 2018 Nov 2018

Submission Deadline

LSST AHM

2018

New baseline run Feature based scheduler runs

Announce list

  • f simulations

Jan 2019 April 2019 June 2019 Aug 2019 Nov 2019

Simulated surveys released

LSST AHM

2019

Scripted Scheduler + CSC for AuxTel

Simulations being created & evaluated

FBS Scheduler + CSC for ComCam

2020 - SSC review 2021 - Baseline survey strategy 2022 - Start of operations