(r2) UCDList_1-5_RFM < IVOA

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---+ Request for Modification (RFM) for the UCD vocabulary towards UCDList v1.5

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 second (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 v1.5 Request For Modifications, from June 2021 to Oct 2021

--- 

<span style="color: #630000; font-size: 17.290000915527344px; font-weight: bold; background-color: transparent;">Accepted RFMs</span>

---

<span style="color: #630000; font-size: 17.290000915527344px; font-weight: bold; background-color: transparent;">Pending RFMs</span>

From [[https://wiki.ivoa.net/twiki/bin/view/IVOA/UCDList_1-3_RFM][UCDList 1.3 RFM]]: pos.rotation, pos.euleraAngle, pos.quaternion, ... pos.heliocentric, pos.heliographic, etc .. postponed for better understanding

From [[https://wiki.ivoa.net/twiki/bin/view/IVOA/UCDList_1-4_RFM][UCDList 1.4 RFM]]: stat.histogram (use case to be further detailed)

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<span style="color: #630000; font-size: 17.290000915527344px; font-weight: bold; background-color: transparent;">Rejected RFMs</span>

   * _phys.rotMeasure_ (concept already existing as _phys.polarization.rotMeasure_)

---++ Proposed RFMs

---+++ Proposals from V. Delouille ([[https://voparis-gitlab.obspm.fr/vespa/ivoa-standards/semantics/vep-ucd/-/blob/master/VEP-UCD-001.txt][VEP-UCD-001]])

   * *Proposed term*: stat.skew
   * *Proposed description*: Statistical skewness, third moment of normalised data distribution function 
   * *Prefix*: P
   * *Rationale*: This term was proposed actually by Veronique Delouille after FITSKeyword evaluation for solar datasets. Would complete the stat properties within the UCD tree. Would be useful for other data as well.
   * *Used-in*: SDO/AIA FITS keywords
   * *Discussion*:The statistical moments (except for the mean value) don't have the same units as the observed quantity, and thus those are another quantity extracted from the data. We propose to set the prefix to P.

--- 

   * *Proposed term*: stat.kurtosis
   * *Proposed description*: Statistical kurtosis, fourth moment of normalised data distribution function
   * *Prefix*: P
   * *Rationale*: This term was proposed actually by Veronique Delouille after FITSKeyword evaluation for solar datasets. Would complete the stat properties within the UCD tree. Would be useful for other data as well.
   * *Used-in*: SDO/AIA FITS keywords
   * *Discussion*: Skewness is related to the asymetry of the distribution, and the kurtosis help to identify outliers.

--- 

   * *Proposed term*: stat.mad
   * *Proposed description*: Statistical median absolute deviation from median
   * *Prefix*: P
   * *Rationale*: This term was proposed actually by Veronique Delouille after FITS Keyword evaluation for solar datasets this is a robust quantity to measure the spread of values in a data set when the statistic is not normal. Would complete the stat properties within the UCD tree. Would be useful for other data as well.
   * *Used-in*: ?
   * *Discussion*: Similar to stat.stdev, but using median operators instead of the mean. 

---+++ Proposals from B. Cecconi ([[https://voparis-gitlab.obspm.fr/vespa/ivoa-standards/semantics/vep-ucd/-/blob/master/VEP-UCD-002.txt][VEP-UCD-002]])

   * *Proposed term*: phys.rotMeasure
   * *Proposed description*: Rotation measure 
   * *Prefix*: P
   * *Rationale*: This term is proposed for the LOFAR4SW Faraday-Rotation IPS  derived product providing DM-RM (Dispersion- and Rotation-Measure) of the interplanetary scintillation from pulsar observations. 
   * *Used-in*: https://voparis-gitlab.obspm.fr/vespa/ivoa-standards/semantics/vep-ucd/-/blob/master/examples/J0332+5434_DM-RM_timeseries.xml
   * *Discussion*:This new term is directly linked to the already existing _phys.dispMeasure_. 
 
*UCD-SCI Answer*: REJECTED. This term already exist as _phys.polarization.rotMeasure_

---+++ Proposals from S. Erard ([[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. 

---

   * *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. 


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Topic revision: r2 - 2021-06-24 - BaptisteCecconi
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