Request for Modification for the UCD list v1.4 - from May 2017 to Feb 2018This page is proposed in the new process for UCDs update discussed at the Interop meeting in Shanghai in May 2017. The new Note Maintenance for UCD specification mentions the details of the updating process. When a new UCD term seems necessary to include in the UCD list, a record describing the request for addition can be expressed as followed : new term proposed, rationale, example of usage, etc , as show in the list below. The term is then discussed within the maintenance committee and the semantics working group and answers from the maintenance committee is given within 1 month. Every 6 months the list of proposed changes are examined by the TCG and the validated changes are ingested in the new version of Endorsed Note for the UCD1+ list of terms. Proposals from Solar and Planetary community ( B. Cecconi et al.)Concept family : electric charge and current
add Q | phys.current | Electric current add Q | phys.current.density | Electric current density
Concept family: Observation geometry ; Illumination conditions
Concept: Incidence angle
Concept: Emergence angle
Concept: Azimuth angle
Concept family: spectroscopic measuresConcept : radiance | ||||||||
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Concept : reflectanceReflectances are relative quantities comparing input radiance or flux to the observed radiance, with various adimensional nomalization, so that their units can't be used for decide which actual physical quantity is shared or plotted. As current spectral analysis tools are using UCDs to decide how to combine data from various sources, there is a need for high level descriptors to sort out the most obvious kinds of normalization of processing. Without this, comparisions between dataset may lead to meaningless results.
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add Q | phys.reflectance.bidirectional.df | Bidirectional reflectance distribution function | ||||||||
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Concept family: Coordinate framesConcept : Cylindrical coordinates | ||||||||
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< < | proposal: pos.cylindrical family : SSIG coordinates systems rationale: no such coordinate branch in the UCD tree yet definition : Cylindrical coordinates tag : S | |||||||
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< < | ##answer accepted S pos.cylindrical "Related to cylindrical coordinates" | |||||||
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< < | proposal: pos.cylindrical.r requires :pos.cylindrical definition : Cylindrical coordinate (radial distance from z-axis) tag : Q | |||||||
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< < | ##answer accepted as pos.cylindrical.r "Radial distance from z-axis (cylindrical coordinates)" | |||||||
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< < | proposal: pos.cylindrical.th definition : Cylindrical coordinate (Azimuthal angle around z-axis) tag : Q | |||||||
> > | NB: less ambiguous as for angle names | |||||||
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< < | ##answer The conventions for the name of the angles varies : seehttp://mathworld.wolfram.com/CylindricalCoordinates.html
##answer accepted as pos.cylindrical.azi "Azimuthal angle around z-axis (cylindrical coordinates)"
proposal: pos.cylindrical.z
definition : Cylindrical coordinate (height from reference plane) tag : Q ##answer accepted as pos.cylindrical.z "Height or altitude from reference plane (cylindrical coordinates)" ## less ambiguous as for angle names | |||||||
Concept: Spherical Coordinates | ||||||||
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< < | proposal: pos.spherical Rationale: not present in UCD tree definition : spherical coordinates tag : S | |||||||
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< < | ##answer accepted pos.spherical "Related to cylindrical coordinates" | |||||||
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< < | proposal: pos.spherical.r definition : spherical coordinate (radial distance from origin) tag : Q | |||||||
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< < | ## answer accepted as pos.spherical.r "Radial distance or radius (spherical coordinates)" | |||||||
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< < | proposal: pos.spherical.th definition : spherical coordinate (colatitude angle) tag : Q | |||||||
> > | Concept : orbital parameters | |||||||
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< < | ##answer same as for cylindrical : various angle names depending on definitions ( http://mathworld.wolfram.com/SphericalCoordinates.html ) | |||||||
> > | %Comment perifocal "src.orbital.periastron" exists but is slightly different %Comment periapsis : check variation in meaning | |||||||
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< < | ##answer proposed as pos.spherical.colat "Polar or Colatitude angle (spherical coordinates)"
proposal: pos.spherical.ph definition : spherical coordinate (Azimuth angle) tag : Q | |||||||
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< < | ##answer proposed as pos.spherical.azi " Azimuthal angle (spherical coordinates)"
Concept : orbital parameters%Comment perifocal "src.orbital.periastron" exists but is slightly different%Comment periapsis : check variation in meaning proposal: src.orbital.periapsis definition : minimal distance to the center of mass for an orbit tag : P ##discussion postponed (time to go to lunch) | |||||||
Concept : rotation params for 3D parameters | ||||||||
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> > | Discussion pos. is the right branch to hook these rotation concepts. | |||||||
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< < | ##pos. is the right branch to hook these rotation concepts _##pos.wcs exist for 2D transformation ; pos.rotation will handle the 3D case --> propose pos.rotation3d_ ##theses parameters will be used soon with real data . We decide to delay the addition and will consider several examples | |||||||
> > | pos.wcs exist for 2D transformation ; | |||||||
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< < | proposal: pos.rotation definition : Relative to rotation tag : S proposal: pos.rotation.eulerAngle definition : Euler angles vector tag : V proposal: pos.rotation.quaternion definition : rotation quaternion vector tag : V proposal: pos.rotation.matrix definition : rotation matrix tag : V proposal: pos.rotation.axis definition : rotation axis vector tag : V | |||||||
> > | pos.rotation will handle the 3D case --> propose pos.rotation3d_ | |||||||
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< < | Concept: spatial resolution | |||||||
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< < | rationale: linear resolution on cartesian or linear spatial axis as opposed to angular resolution proposal: pos.resolution definition : Spatial linear resolution (not angular) tag : Q | |||||||
> > | Theses parameters will be used soon with real data . | |||||||
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< < | ##answer add Q | pos.resolution | Spatial linear resolution (not angular) ##inserted | |||||||
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Concept: spatial resolution | |||||||
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Concept: heliocentric coordinates | |||||||
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< < | longitude and latitude can be expressed as proposal: pos.bodyrc.lon;pos.heliocentric proposal: pos.bodyrc.lat;pos.heliocentric % induced changes in assign tool: if heliocentric, or centric except geocentric , --> not earth .... change token ##answer agreed to modify assigning tool - done | |||||||
> > | Concept: heliocentric coordinates | |||||||
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< < | ##discussion: In body-centric coordinates, longitudes are defined from sub-observer point, while body-graphic coordinates are defined from a standard body reference frame | |||||||
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< < | VESPA team to check consistency between heliocentric and planetocentric definitions | |||||||
> > | add S | pos.bodygraphic | Body-graphic related coordinate | |||||||
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< < | ##answer add S | pos.bodycentric | Body-centric related coordinate <br/> ##answer add S | pos.bodygraphic | Body-graphic related coordinate ##inserted | |||||||
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< < | Concept: checksum | |||||||
> > | Concept: checksum | |||||||
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< < | proposal: meta.checksum | |||||||
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< < | rationale: to check integrity of data | |||||||
> > | Concept: modification date of a dataset | |||||||
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< < | definition : numerical signature of digital data | |||||||
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< < | ##answer add Q | meta.checksum | Numerical signature of digital data <br/>##inserted | |||||||
> > | Other items | |||||||
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< < | Concept: modification date of a dataset | |||||||
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< < | proposal: time.update
definition : modification date for a dataset
##answer : use *time.processing*
done : add update in the definition of this ucd
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< < | Concept: shape of planetary objects | |||||||
> > | Concept: shape of planetary objects | |||||||
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< < | %this is used to represent the 3D shape of object: a 3D lattice proposal: phys.shape definition : 3D shape of an object tag : Q usage : phys.shape;meta.modelled for a 3D shape model usage : phys.shape;pos.bodyrc.alt for elevation or terrain model (distribution of altitude on top of a reference ellipsoid or geoid ) ##discussion: postponed until a real case is met | |||||||
> > | %this is used to represent the 3D shape of object: a 3D lattice
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Concept: spectral polarization data#concept :spatial matrixrationale: helps to identify or characterize measurement type | ||||||||
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< < | proposal: phys.polarization.coherenceMatrix definition: coherence matrix of radio signals usage phys.polarisation.coherenceMatrix:instr tag:Q | |||||||
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< < | ##answer add Q | phys.polarization.coherency | Matrix of the correlation between components of an electromagnetic wave | |||||||
> > | NB: This will work for all electromagnetic signals and not only in radio regime | |||||||
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< < | This will work for all electromagnetic signals and not only in radio regime | |||||||
> > | caveat: not compatible to instr branch in the UCD tree. | |||||||
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< < | not compatible to instr branch in the UCD tree. | |||||||