UCDList_1-6_RFM < IVOA

IVOA Web>IvoaSemantics>UCDList_1-6_RFM (2024-03-22, MireilleLouys) (raw view)
---+ Request for Modification (RFM) for the UCD vocabulary towards UCDList v1.6

This page summarises the steps for Modifications and Updates proposed in the [[https://www.ivoa.net/documents/UCDlistMaintenance/index.html][UCD List Maintenance]] recommendation. The UCDListMaintenancePage summarises the past and current RFMs.

The third (on going) iteration for the Request for modifications of UCD terms is summarized in the following content.

These terms are submitted for evaluation to the UCD science committee (see details in the Maintenance Specification document).

---+ UCDList v1.6 Request For Modifications, from Jan 2024 to now

---++ Proposed RFMs
---

Still in discussion from RFM 1.5
---+++ Proposals from StephaneErard ([[https://voparis-gitlab.obspm.fr/vespa/ivoa-standards/semantics/vep-ucd/-/blob/master/VEP-UCD-003.txt][VEP-UCD-003]])

   * *Proposed term*: pos.moc
   * *Proposed description*: Multi-order coverage
   * *Prefix*: S
   * *Rationale*: This term is used to tag a parameter containing a MOC (of any type, e.g, temporal, spatial, both, or any future MOC types)
   * *Used-in*: EPNcore-2.0
   * *Discussion*:The closest term available is _pos.contour_, but it doesn't seem adequate for multi-order coverage.
*Sci-UCD Discussion*: Three cases:
   * a VOTable field is tagged with "pos.moc", in this case, the xtype attribute must be present to tell what is the encoding of the MOC
   * "pos.moc" is in the EpnCore "measurement_type", to advertise the content of the product. Could be used with "dataproduct_type", to tell which axes are in the MOC (e.g., 'im' for classical MOC, 'mo' for STMOC, 'ts' for TMOC...)
   * A VOTable field with URLs pointing to MOC products. The UCD would be "meta.ref.url;pos.moc"
ML: To be discussed again

BC [2023-06-22]: "meta.coverage" proposition discussed in VEP 

*Decision*: implement "meta.coverage" as proposed in [[https://voparis-gitlab.obspm.fr/vespa/ivoa-standards/semantics/vep-ucd/-/blob/master/VEP-UCD-003.txt][VEP-UCD-003]].
 
---

   * *Proposed term*: pos.projection
   * *Proposed description*: Geometric projection
   * *Prefix*: S
   * *Rationale*: This term is used to tag a parameter containing the projection in use, or to identified parameters that have been projected onto a map (map projected products).
   * *Used-in*: EPNcore-2.0
   * *Discussion*: The current UCD List contains `pos.lambert` which is a specific projection type, which can't cover all the needs for geometric projection tagging.

BC [2023-06-22]: accepted in VEP, to be used with meta.id as primary. 

If `pos.lambert` is not used currently in registry => possibly deprecate and move to `pos.projection.lambert` ?

---

*Sci-UCD Discussion*: during EPN-TAP RFC review, MarkTaylor proposed to have Q prefixes for both pos.moc and pos.projection.

---+++ Proposal from AdaNebot ([[https://voparis-gitlab.obspm.fr/vespa/ivoa-standards/semantics/vep-ucd/-/blob/master/VEP-UCD-004.txt][VEP-UCD-004]])

   * *Proposed term*: time.period.oscillation
   * *Proposed description*: Period of pulsation of a body (similar to solar pulsations or oscillations)
   * *Prefix*: Q
   * *Rationale*: This term is used to measure periods in oscillating phenomena.
   * *Used-in*: https://academic.oup.com/mnras/article/487/3/3523/5512602
   * *Discussion*: This term was proposed actually by Ada Nebot to consider oscillating phenomena on sky objects and cover possible time measurements used in these studies. This is a first term proposal for addition concerning oscillating stars, etc ...
2022-05-20 ML pending . More discussion to refine a clear definition

BC [2023-06-22]: no objection, but ML to discuss again with Ada.

*BC [2024-03-21]: proposed term:* "time.period.pulsation" with Label "Period of pulsation or oscillation of a body or a phenomenon"  

---+++ Proposal from MarkusDemleitner & BaptisteCecconi ([[https://voparis-gitlab.obspm.fr/vespa/ivoa-standards/semantics/vep-ucd/-/blob/master/VEP-UCD-005.txt][VEP-UCD-005]], initially in [[https://wiki.ivoa.net/twiki/bin/view/IVOA/UCDList_1-4_RFM][UCDList 1.4 RFM]])

   * *Proposed term*: stat.histogram
   * *Proposed description*: An array-like object with counts or ratios in bins
   * *Prefix*: P
   * *Rationale*:
   * *Used-in*:
   * *Discussion*: See [[https://voparis-gitlab.obspm.fr/vespa/ivoa-standards/semantics/vep-ucd/-/blob/master/VEP-UCD-005.txt][VEP-UCD-005]], and [[https://wiki.ivoa.net/twiki/bin/view/IVOA/UCDList_1-4_RFM][UCDList 1.4 RFM]] for the detailed discussion.
*Sci-UCD Further Discussion*: The same discussion as that of *pos.moc* applies for the use cases. Depending on how what is tagged, P or S flag should be used, and a specific *dataproduct_type* may also be needed to advertise a product in an ObsTAP or EPN-TAP table.

BC [2023-06-22]: what about using `stat.distribution` which would be more generic (with possible child `stat.distribution.cumulative` or `stat.distribution.histogram`) ?

*BC [2024-03-21]: pending , needs more discussion*

---++ Proposed RFMs - suggestions for datasets issued in the science domain of gravitational waves
---+++ Proposal from M.Louys , S.Derriere for P. Chanial ([[https://voparis-gitlab.obspm.fr/vespa/ivoa-standards/semantics/vep-ucd/-/blob/master/VEP-UCD-011.txt][VEP-UCD-011]])

   * *Proposed term*: stat.confidenceLevel
   * *Proposed label*: Level of confidence for a detection or classification process 
   * *Proposed description*: a value to state the level of confidence for a detection, usually in percent (?).
   * *Prefix*: P
   * *Rationale*: GW studies produce maps of the sky with regions showing detection likelihood at particular confidence level . Such a confidence level can be a selection criteria for a map, or a dataset in general.
   * *Used-in*: Gravitational waves catalogs
   * *Discussion*:

BC [2023-06-22]: Would be useful for a column providing the confidence level used to derive min/max values of a distribution. 
Could be associated with `stat.stdev` or `stat.percentile` (would require change `stat.stdev` to Q). Examples:
   * 3 sigma confidence level => value = 3 and ucd = `stat.confidenceLevel;stat.stdev`
   * 95 % confidence level => value = 95 and ucd = `stat.confidenceLevel;stat.percentile`
To be checked if applicable in some Vizier tables. 

*BC [2024-03-21]:Proposed solution:* 

   * New Term: stat.confidenceLevel 
   * Action: Addition
   * Label: Level of confidence for a detection or classification process 
   * Prefix: P

   * Update Term: stat.stdev 
   * Action: Modification
   * Prefix: Q


---+++ Proposal from M.Louys , S.Derriere for P. Chanial ([[https://voparis-gitlab.obspm.fr/vespa/ivoa-standards/semantics/vep-ucd/-/blob/master/VEP-UCD-012.txt][VEP-UCD-012]])

   * *Proposed term*: phys.inspiralSpin
   * *Proposed description*: Effective inspiral spin in binary mergers  (used in GW detections )
   * *Prefix*: Q
   * *Label*: Effective inspiral spin in binary mergers  (used in GW detections )   
   * *Rationale*: In the study of binary mergers, the notion of spin for each component of the system 
determines the dynamics of the system and differs from the angular momentum already 
defined as a ucd term.
   * *Used-in*: LIGO Virgo Gravitational waves detection
   * *Discussion*:
      * https://en.wikipedia.org/wiki/List_of_gravitational_wave_observations#List_of_gravitational_wave_events
      * https://www.quora.com/What-is-the-inspiral-spin-parameter-and-why-are-we-surprised-that-it-is-so-low-in-the-LIGO-events 

*BC [2024-03-21]:Proposed solution: Accept*

---+++ Proposals from M.Louys , S.Derriere for P. Chanial ([[https://voparis-gitlab.obspm.fr/vespa/ivoa-standards/semantics/vep-ucd/-/blob/master/VEP-UCD-013.txt][VEP-UCD-013]])

   * *Proposed term*: stat.falsePositive 
   * *Proposed description*: Related to false alarm or false positive detection
   * *Prefix*: Q
   * *Description*: Used to evaluate the rate of false alarm in detection problems.
   * *Rationale*:Needed for support of catalogs of events detection in various multi- messenger data collections.
   * *Used-in*: Gravitational waves detection (LIGO, Virgo) and in event detections more generally.
   * *Discussion*:
      * Dataset examples:
         * https://en.wikipedia.org/wiki/List_of_gravitational_wave_observations#List_of_gravitational_wave_events
         * Vizier catalogs on GW

*BC [2024-03-21]:Proposed solution: Accept*

---

   * *Proposed term*: stat.falseNegative  
   * *Proposed description*: Related to missed or false negative detection
   * *Prefix*: Q
   * *Description*: Used to evaluate the rate of missed or false negative detection.
   * *Rationale*:Needed for support of catalogs of events detection in various multi- messenger data collections.
   * *Used-in*: Gravitational waves detection (LIGO, Virgo) and in event detections more generally.
   * *Discussion*:
      * Dataset examples:
         * https://en.wikipedia.org/wiki/List_of_gravitational_wave_observations#List_of_gravitational_wave_events

*BC [2024-03-21]:Proposed solution: Accept* 

---+++ Proposal from B.Cecconi ([[https://voparis-gitlab.obspm.fr/vespa/ivoa-standards/semantics/vep-ucd/-/blob/master/VEP-UCD-014.txt][VEP-UCD-014]])

   * *Proposed term*: phys.adu
   * *Proposed description*: Analog to digital units, raw samples of an instrument, not converted into physical unit.  
   * *Prefix*: P
   * *Description*: The raw data samples, often referred to as analog-to-digital-units (ADU). They are not converted yet into physical units. In other words, the transfer function of the instrument has not been applied.
   * *Rationale*: This term would be useful to refer to raw data. This term was mentionned during the preparation of the ObsCore for Radioastronomy extension. The first atom word ('phys.') could be something else (like 'meta.').
   * *Used-in*: 
      * Dataset examples:
         * cassini_rpws.epn_core table (on voparis-tap-maser TAP server), containing raw, calibrated and derived products.
   * *Discussion* [2024-03-21]
      * in the ObsCore Radio extension (as of this date): _"In the current UCD vocabulary (UCD1+ controlled vocabulary - Updated List of Terms Version 1.5) there appear to be no primary words suitable to describe raw SD data. o_ucd=phot.flux.density, which fits well for appropriate data, does not seem appropriate, since the single dish measured quantity is expressed in raw counts coming from the digitisation of a voltage signal generated in the receiver chain by the incoming electromagnetic field. Further discussion on o_ucd is ongoing within the Semantics WG."_
      * A proposal could be to use the secondary word "stat.uncalib" to indicate the "raw" status of the quantity, but a primary UCD word must be used, such as "phot.count", or "phys.current" (or "phys.voltage" which doesn't exist yet)
      * Conceptually the "stat.adu" is referring to the output of an analogue-to-digital sampler.
      * If we add "phys.voltage", a solution would be *phys.voltage;stat.uncalib*

   * *BC [2024-03-21]: Proposed change*: 
      * *New term*: phys.voltage
      * *Prefix*: Q
      * *Description*: Electric potential difference over a distance or measured by an instrument.


---+++ Proposal from M.Louys ([[https://voparis-gitlab.obspm.fr/vespa/ivoa-standards/semantics/vep-ucd/-/blob/master/VEP-UCD-015.txt][VEP-UCD-015]])

   * *Proposed term*: phys.pulseHeight or phys.pulse.amplitude
   * *Proposed description*: Amplitude measured by a pulse analyser after a particle or radiation detector (photon, gamma ray, ...).  
   * *Prefix*: Q
   * *Description*: In event-list data product obtained in X-ray or Gamma-ray, the need to characterise the raw measure provided by the detector has appeared. A similar requirement was formulated for radio data as well.
   * *Rationale*: This term would be useful to refer to raw data coming out of a detector and not calibrated yet. 
      The need for such a term was mentionned during the preparation of the IVOA Note "VO Data discovery for High Energy data sets".
   * *Used-in*:  Chandra event-list, CTA event-list before calibration.
   * *Discussion*: 
      * There may be an overlap with the proposal for "phys.adu" in VEP-UCD-14.txt. To be discussed. 
      * [2024-03-21] Existing UCD for pulse: "src.var.pulse" and for amplitude: "src.var.amplitude" (but with E prefix, which should be changed Q to have this word applied to any other primary word)
   * *BC [2024-03-21]: Proposed change*:  "src.var.amplitude" prefix set to "Q".
      * proposed solution: * "src.var.amplitude;src.var.pulse;stat.uncalib"


---++ Proposed RFMs  for Ambiant Conditions at telescopes sites

---++++ Proposals from A. Micol , ESO Archive 

List of terms and concepts to cover (open for discussion) : [[%ATTACHURL%/UCD_List_AmbientParams-annotated-revMarch10-2023-v2.xlsm][ ESO VLT Ambient parameters]]
with new terms proposed.

Example Proposal for new term _humidity_ under the subtree _obs.atmos._

   * *Proposed term*: obs.atmos.humidity
   * *Proposed description*:
   * *Prefix*: S
   * *Rationale*: Ambient conditions measure various physical parameters at telescope site to monitor turbulence, seeing, etc.
   * *Used-in*: ESO FITS keywords for observations at Paranal , etc .
   * *Discussion*: Some of these parameters are general, some have a very specific definition for the assessment of physical conditions at the telescope's site. Their meaning may be restricted to a the local definition of the measure at the site. In this case , such terms can be branched under the cud node 'obs.atmos'. 

      On the contrary general terms can be branched below phys.*. 

      The proposal for adding a obs.atmos subtree to the UCD tree is explained in [[%ATTACHURL%/ProposalForNew_obs_atmos_UCDs2023-05-10.pdf][ Proposal for obs.atmos subtree]]
---

---++ Proposed RFMs - modification suggestions for planetary science 
---++++ Proposals from J. Berthier , IMCCE, Paris Observatory
List of terms and concepts to cover (open for discussion) : [[%ATTACHURL%/ucd_RFM_SolarSystem_JB.pdf][UCDs Requests for Planetary data]]

See [[https://voparis-gitlab.obspm.fr/vespa/ivoa-standards/semantics/vep-ucd/-/blob/master/VEP-UCD-016.txt][VEP-UCD-016]] document for discussions. 

Generic comment: We need "Used-in" sections to be filled. 

---+++ Summary for iteration UCDList1.6 to UCDList1.7

---+++ UCD proposal applied as changes for UCDList1.6

| *Term* | *VEP-UCD link* | *Modification Type* | *Decision* |
| xxx | [[https://voparis-gitlab.obspm.fr/vespa/ivoa-standards/semantics/vep-ucd/-/blob/master/VEP-UCD-yy.txt][VEP-UCD-yy.txt]] | action | approved |

---+++ UCD proposals rejected and solved

| *Term* | *VEP-UCD link* | *Suggestion*| *Use instead* | 
| xxx |  | can combine existing UCD |  |
| |  | |  |

---+++ UCD proposals not solved yet --&gt; for next step

| *Term* | *VEP-UCD link* | *Modification Type* | *Decision* |
| |  | | |
| | | |  |


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Attachments
Topic attachments
I	Attachment	History	Action	Size	Date	Who	Comment
pdf	ProposalForNew_obs_atmos_UCDs2023-05-10.pdf	r1	manage	61.8 K	2023-05-11 - 05:46	MireilleLouys	Proposed UCD tree inclusion for Ambient parameters at telescope site
xlsm	UCD_List_AmbientParams-annotated-revMarch10-2023-v2.xlsm	r1	manage	26.3 K	2024-03-22 - 17:47	MireilleLouys	3rd proposal / to be discussed
xlsx	UCD_List_AmbientParams-annotated-vrev27Janv2023.xlsx	r1	manage	25.3 K	2023-03-02 - 14:31	MireilleLouys	revised ambient
ods	UCD_List_AmbientParams-annotatedOct22.ods	r1	manage	32.1 K	2022-10-24 - 16:19	MireilleLouys	list of terms to discuss
pdf	ucd_RFM_SolarSystem_JB.pdf	r1	manage	23.3 K	2023-05-09 - 13:40	MireilleLouys	RFM for Solar System data/ J. Berthier
Topic revision: r15 - 2024-03-22 - MireilleLouys
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