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

Pending RFMs

From UCDList 1.3 RFM: pos.rotation, pos.euleraAngle, pos.quaternion, ... pos.heliocentric, pos.heliographic, etc .. postponed for better understanding

From UCDList 1.4 RFM: stat.histogram (use case to be further detailed)

Rejected RFMs

• phys.rotMeasure (concept already existing as phys.polarization.rotMeasure)

Proposed RFMs

Proposals from V. Delouille (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 (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 (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.