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  1. Data Management
  2. DM-19594

Contributions to Timeseries DMTN

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    • Type: Story
    • Status: In Progress
    • Resolution: Unresolved
    • Fix Version/s: None
    • Component/s: None
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      Description

      This ticket is to provide contributions to the DMTN summarizing options for timeseries feature computations. In particular this includes summarizing relevant requirements.

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            mgraham Melissa Graham added a comment -

            First task is to review current version https://dmtn-118.lsst.io/v/DM-19593/index.html
            by the end of December.

            Show
            mgraham Melissa Graham added a comment - First task is to review current version  https://dmtn-118.lsst.io/v/DM-19593/index.html by the end of December.
            Hide
            mgraham Melissa Graham added a comment -

            A look through requirements documentation for anything related to variability characterization:

            LPM-17 3.5 Data Processing and Management Requirements
            "Level 2 data products ... will include ... variability information such as ... an appropriate compact description of light curves."
            "The data stream will also include prior variability information ... [which] will at the very least include low-order light-curve moments and probability that the object is variable, and ideally the full light curves in all available bands."

            LSE-61 1.3.7 Characterizing Variability
            DMS-REQ-0319
            Specification: For alert production, DIAObject variability characterization shall include data
            collected during the time period from the present to at least diaCharacterizationCutoff in
            the past.

            LSE-61 1.3.8.1 DIAObject Attributes
            DMS-REQ-0272
            Specification: For each DIAObject the DMS shall store summary attributes including at least ... periodic and non-periodic variability measures; and flags that encode special conditions encountered in measuring the above quantities.

            LSE-61 1.3.11 DIAForcedSource Catalog and 1.4.16 Forced-Source Catalog
            Just noting the discussions say "The large number of such forced sources makes it impractical to measure more attributes than are necessary to construct a light curve for variability studies.", and that this means there's no requirement to include Forced Photometry in any variability characterization parameter – not that it couldn't be done anyway of course.

            LSE-61 1.3.18 Regenerating L1 Data Products During Data Release Processing
            DMS-REQ-0325
            Discussion: Variability characterization will use the full light curve history.

            LSE-61 1.4.3.2 Object Characterization
            DMS-REQ-0276
            Specification: Each entry in the Object Catalog shall include the following characterization
            measures ... and a variability characterization.

             

            Show
            mgraham Melissa Graham added a comment - A look through requirements documentation for anything related to variability characterization: LPM-17 3.5 Data Processing and Management Requirements "Level 2 data products ... will include ... variability information such as ... an appropriate compact description of light curves." "The data stream will also include prior variability information ... [which] will at the very least include low-order light-curve moments and probability that the object is variable, and ideally the full light curves in all available bands." LSE-61 1.3.7 Characterizing Variability DMS-REQ-0319 Specification: For alert production, DIAObject variability characterization shall include data collected during the time period from the present to at least diaCharacterizationCutoff in the past. LSE-61 1.3.8.1 DIAObject Attributes DMS-REQ-0272 Specification: For each DIAObject the DMS shall store summary attributes including at least ... periodic and non-periodic variability measures; and flags that encode special conditions encountered in measuring the above quantities. LSE-61 1.3.11 DIAForcedSource Catalog and 1.4.16 Forced-Source Catalog Just noting the discussions say "The large number of such forced sources makes it impractical to measure more attributes than are necessary to construct a light curve for variability studies.", and that this means there's no requirement to include Forced Photometry in any variability characterization parameter – not that it couldn't be done anyway of course. LSE-61 1.3.18 Regenerating L1 Data Products During Data Release Processing DMS-REQ-0325 Discussion: Variability characterization will use the full light curve history. LSE-61 1.4.3.2 Object Characterization DMS-REQ-0276 Specification: Each entry in the Object Catalog shall include the following characterization measures ... and a variability characterization.  
            Hide
            mgraham Melissa Graham added a comment -

            Initial comments on current draft emailed to Eric.

            Show
            mgraham Melissa Graham added a comment - Initial comments on current draft emailed to Eric.

              People

              • Assignee:
                mgraham Melissa Graham
                Reporter:
                ebellm Eric Bellm
                Watchers:
                Eric Bellm, Melissa Graham
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                  Updated:

                  Summary Panel