Request for Modification for the UCD list

This 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 disussed 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 : electric current density
family: plasma environement
proposal: phys.flux ; phys.charge
requires : phys.charge with definition : Electric charge and tag : Q

#concept : electric current density
family: plasma environement
proposal: phys.flux ; phys.charge
requires : phys.charge with definition : Electric charge and tag : Q

##answer we understood the need for two concepts : electric current density and electric charge proposal for update:

add Q | phys.electCharge | Related to Electric charge
add Q | phys.current | Electric current
add Q | phys.current.density | Electric current density

benefits : introduces phys.current; this definition is more focused on the requested concept --> implies better assignment

#concept : Incidence
family: Observation geometry ; Illumination conditions
proposal: pos.incidenceAng
requires :
definition : Incidence angle
tag : Q

#concept: Emergence angle
family: Observation geometry ; Illumination conditions

##answer please include figure to illustrate the various required angles

proposal: pos.emergenceAng
definition : Emergence angle
tag : Q

#concept:Azimuth angle
proposal: pos.azimuthAng
definition : Azimuthal angle
tag : Q

proposal: pos.cylindrical
family : SSIG coordinates systems
rationale: no such coordinate branch in the UCD tree yet
definition : Cylindrical coordinates
tag : S

proposal: pos.cylindrical.r
requires :pos.cylindrical
definition : Cylindrical coordinate (radial distance from z-axis)
tag : Q

proposal: pos.cylindrical.th
definition : Cylindrical coordinate (Azimuthal angle around z-axis)
tag : Q

proposal: pos.cylindrical.z
definition : Cylindrical coordinate (height from reference plane)
tag : Q

#concept Spherical Coordinates

proposal: pos.spherical
Rationale: not present in UCD tree definition : spherical coordinates
tag : S

proposal: pos.spherical.r
definition : spherical coordinate (radial distance from origin)
tag : Q

proposal: pos.spherical.th
definition : spherical coordinate (colatitude angle)
tag : Q

proposal: pos.spherical.ph
definition : spherical coordinate (Azimuth angle)
tag : Q

#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

#concept : rotation params
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

#concept: spatial resolution

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

##answer add Q | pos.resolution | Spatial linear resolution (not angular)

%heliocentric coordinates
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

%metadata branch

proposal: meta.checksum
rationale: to check integrity of data
definition : numerical signature of digital data
tag : Q

##answer add Q | meta.checksum | Numerical signature of digital data

proposal: time.update
answer : can use time.processing instead
suggestion : add update in the definition of this ucd
_##answer agreed change token in the assigning tool _

# spectroscopic measures
#concept : reflectance

proposal: phys.reflectance
rationale : diff from albedo
definition, usage : radiance factor , (received radiance divided by input radiance) , may include thermal emission
% annotation master : to check ; consequence : change definition to albedo and remove reflectance
% | phys.albedo | Albedo or reflectance
derived usage :
Radiance Factor : arith.factor;phys.reflectance

##answer add Q | phys.reflectance | Radiance factor, (received radiance divided by input radiance), may include thermal emission

proposal: phys.reflectance.bidirectional
definition : bidirectional reflectance
tag : Q

##answer add Q | phys.reflectance.bidirectional | Bidirectional reflectance

proposal: phys.brdf
rationale : specific term as much as psf for the community
definition : bidirectional reflectance distribution function
tag: Q

##answer add Q | phys.reflectance.bidirectional.df | Bidirectional reflectance distribution function

proposal: phys.reflectance.factor
definition : reflectance normalized per direction cosine of incidence angle ??
tag : Q

##answer add Q | phys.reflectance.factor | reflectance normalized per direction cosine of incidence angle

nb : check relevance and possible ambiguity with radiance factor...

%for normalized reflectance concept
proposal arith.ratio;phys.reflectance
definition : reflectance normalized per reflectance at one wavelength

#shape of planetary objects

this is used to represent the 3D shape of object: a 3D lattice

proposal: phys.shape
definition : 3D shape of a 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 appears

# spectral polarization data
#concept :spatial matrix
rationale: helps to identify or characterize measurement type

_##discussion: postponed until a real case appears

proposal: phys.polarization.coherenceMatrix
definition: coherence matrix of radio signals
usage phys.polarisation.coherenceMatrix;instr
tag:Q

##answer add Q | phys.polarization.coherency | Matrix of the correlation between components of electromagnetic waves

not compatible to instr branch in the UCD tree

<!--
* Set ALLOWTOPICRENAME = TWikiAdminGroup
-->