(r20) UCDList_1-4_RFM < IVOA

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---+ 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 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.)

<span style="color: darkgreen;">#concept : electric current density</span> <br />family: plasma environment <br />proposal: <strong>phys.flux ; phys.charge </strong><br />requires : phys.charge with definition : Electric charge and tag : Q

_##answer we understood the need for two concepts : electric current density and electric charge_ <span style="background-color: transparent;"> </span> _proposal for update:_

_add Q | *phys.electCharge* | Electric charge <br /> add Q | *phys.current* | Electric current<br />add Q | *phys.current.density* | Electric current density_

_inserted_

_benefits : introduces phys.current; this definition is more focused on the requested concept --&gt; implies better assignment_

<span style="color: darkgreen;">#concept family: Observation geometry ; Illumination conditions</span>

Representation of the various angles : Explained in paper <a target="_blank" href="https://doi.org/10.1016/j.pss.2015.06.004" title="Persistent link using digital object identifier">https://doi.org/10.1016/j.pss.2015.06.004</a> <br /> See figure attached [[http://wiki.ivoa.net/internal/IVOA/RFMforUCD/emergence_incidenceAngle.jpg][here]] <br /> theta_i = Incidence Angle, theta_e = Emergence Angle, alpha = Phase Angle <br /> The angle phi (azimuth) is not required for illumination condition description (and we already have a UCD for this) _from Baptiste Cecconi_

#rationale -from B. Cecconi - 06 July 2017 - see semantics list for the email threads

in planetary sciences ... our use cases are the following:

- in EPNcore, the illumination conditions are search parameters, we have 6 separate columns for the min/max values of those 3 angles.

- for planetary images or spectra, the product metadata must contain the observation geometry, and those 3 angles are to be there, altogether.

<span style="color: darkgreen;">#concept: Incidence angle</span><br /> proposal: *pos.incidenceAng* <br />requires : <br />definition : Incidence angle<br />tag : Q

_##answer accepted as : *pos.posAng.incidence* with definition : "Angle of incidence of a vector e.g illumination vector"_

<span style="color: darkgreen;">#concept: Emergence angle</span><br />proposal:<strong> pos.emergenceAng</strong><br /> definition : Emergence angle<br />tag : Q

_##answer accepted as : *pos.posAng.emergence* with definition : "Angle of emergence e.g. a reflection vector"_

<span style="color: darkgreen;">#concept:Azimuth angle</span><br /> proposal: *pos.azimuthAng* <br />definition : Azimuthal angle<br />tag : Q

_##answer accepted as : *pos.posAng.azi* with definition : "Azimuthal angle of a vector e.g. reflected vector"_

_##general comment pos.posAng in the UCD vocabulary is defined as : "Position angle of a given vector", which is very general. <br /> We decided to branch the various requested angles under this category.##_

<span style="color: darkgreen; background-color: transparent;">#concept: Cylindrical coordinates</span>

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

_##answer accepted *pos.cylindrical* "Related to cylindrical coordinates"_

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

<em>##answer accepted as *pos.cylindrical.r* "R</em><em>adial distance from z-axis </em> _(cylindrical coordinates)"_

proposal: <strong>pos.cylindrical.th </strong><br />definition : Cylindrical coordinate (Azimuthal angle around z-axis)<br />tag : Q

<em><span style="font-family: arial, verdana, sans-serif; font-size: 13.65px;"> </span><span style="color: slateblue;"><span style="font-family: arial, verdana, sans-serif; font-size: 13.65px;">##</span>answer</span> The conventions for the name of the angles varies : see </em><span style="font-family: arial, verdana, sans-serif;"><span style="font-size: 13.65px;"> _http://mathworld.wolfram.com/CylindricalCoordinates.html_ </span></span>

<em>##answer accepted as *pos.cylindrical.azi* "</em><em>Azimuthal angle around z-axis (cylindrical coordinates)"</em>

<span style="background-color: transparent;">proposal: </span> *pos.cylindrical.z* <span style="background-color: transparent;"> </span>

definition : Cylindrical coordinate (height from reference plane)<br />tag : Q

_##answer accepted as *pos.cylindrical.z* "Height or altitude from reference plane_ _(cylindrical coordinates)"_

_## less ambiguous as for angle names_

<span style="color: darkgreen;">#concept Spherical Coordinates</span>

proposal: <strong>pos.spherical</strong><br />Rationale: not present in UCD tree definition : spherical coordinates <br />tag : S

_##answer accepted *pos.spherical* "Related to cylindrical coordinates"_

proposal:<strong> pos.spherical.r </strong><br />definition : spherical coordinate (radial distance from origin)<br />tag : Q

_## answer accepted as *pos.spherical.r* "Radial distance or radius (spherical coordinates)"_

proposal: *pos.spherical.th* <br />definition : spherical coordinate (colatitude angle)<br />tag : Q

_##answer same as for cylindrical : various angle names depending on definitions_ ( _http://mathworld.wolfram.com/SphericalCoordinates.html )_

<em>##answer proposed as pos.spherical.colat "</em><em>Polar or Colatitude angle (spherical coordinates)"</em>

<span style="background-color: transparent;">proposal: </span> *pos.spherical.ph*

definition : spherical coordinate (Azimuth angle)<br />tag : Q

<em>##answer proposed as *pos.spherical.azi* " </em><em>Azimuthal angle (spherical coordinates)</em><em>"</em>

<span style="color: darkgreen;">#concept : orbital parameters</span> <br />%Comment perifocal "src.orbital.periastron" exists but is slightly different<br />%Comment periapsis : check variation in meaning <br /> proposal: *src.orbital.periapsis* <br />definition : minimal distance to the center of mass for an orbit<br />tag : P<br /><br /> <span style="color: darkgreen;">#concept : rotation params </span><br /> proposal: *pos.rotation* <br />definition : Relative to rotation <br />tag : S<br /><br /> proposal: <strong>pos.rotation.eulerAngle </strong><br />definition : Euler angles vector <br />tag : V<br /><br />proposal: <strong>pos.rotation.quaternion </strong><br />definition : rotation quaternion vector<br />tag : V<br /> <br />proposal:<strong> pos.rotation.matrix</strong> <br />definition : rotation matrix<br />tag : V<br /><br /> proposal: <strong>pos.rotation.axis </strong><br />definition : rotation axis vector<br />tag : V

<span style="color: darkgreen;">#concept: spatial resolution </span>

rationale: linear resolution on cartesian or linear spatial axis as opposed to angular resolution <br />proposal: <strong>pos.resolution </strong><br />definition : Spatial linear resolution (not angular)<br />tag : Q

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

_##inserted_ 

<span style="color: darkgreen;">%heliocentric coordinates </span><br />longitude and latitude can be expressed as <br />proposal: pos.bodyrc.lon;pos.heliocentric <br />proposal: pos.bodyrc.lat;pos.heliocentric <br />% induced changes in assign tool: if heliocentric, or centric except geocentric , --&gt; not earth .... change token<strong> <br /></strong><br /><em>##answer agreed assigning tool to modify</em>

_##inserted_ 

*%metadata branch<br /><br />proposal: meta.checksum* <br />rationale: to check integrity of data <br />definition : numerical signature of digital data <br />tag : Q

_##answer_ _add Q | *meta.checksum* | Numerical signature of digital data_

_##inserted_ 

proposal: *time.update* <br />definition : modification date for a dataset<br /><em>##answer : use *time.processing*  <br />done : add update in the definition of this ucd</em> <br /><br /> <span style="color: darkgreen;"># spectroscopic measures<br /></span>

<span style="color: darkgreen;">#concept : radiance</span> <br />ask for modification of the definition in the UCD list : should be radiant power from the source per unit area (of source) and unit solid angle

<span style="color: darkgreen;">#concept : reflectance </span>

proposal: *phys.reflectance* <br />rationale : different from albedo <br />definition: the radiance divided by solar flux : I over F

usage : radiance factor , (received radiance divided by input radiance) , may include thermal emission <br />% annotation master : to check ; consequence : change definition to albedo and remove reflectance <br />% | phys.albedo | Albedo or reflectance<br />derived usage :<br />Radiance Factor : arith.factor;phys.reflectance<br /><br /> _##answer add Q | phys.reflectance | Radiance factor, (received radiance divided by input radiance), may include thermal emission_

proposal: *phys.reflectance.bidirectional* <br />definition : bidirectional reflectance <br />tag : Q

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

proposal: <strong>phys.brdf</strong><br />rationale : specific term as much as psf for the community <br />definition : bidirectional reflectance distribution function <br />tag: Q <br /><br /> _##answer add Q | phys.reflectance.bidirectional.df | Bidirectional reflectance distribution function_

proposal: <strong>phys.reflectance.factor </strong><br />definition : reflectance normalized per direction cosine of incidence angle ??<br />tag : Q

_##answer add Q | phys.reflectance.factor | Reflectance normalized per direction cosine of incidence angle_

<em>nb : check relevance and possible ambiguity with radiance factor... <br /></em>

%for normalized reflectance concept<br /> proposal *arith.ratio;phys.reflectance* <br />definition : reflectance normalized per reflectance at one wavelength <br /><br />#shape of planetary objects<br />this is used to represent the 3D shape of object: a 3D lattice<br /><br /> proposal: <strong>phys.shape</strong><br />definition : 3D shape of an object <br />tag : Q<br />usage : phys.shape;meta.modelled for a 3D shape model<br />usage : phys.shape;pos.bodyrc.alt for elevation or terrain model (distribution of altitude on top of a reference ellipsoid or geoid )<br /><br /><span style="color: darkgreen;"># spectral polarization data </span><br /> #concept :spatial matrix<br />rationale: helps to identify or characterize measurement type

<br />proposal: <strong>phys.polarization.coherenceMatrix</strong><br />definition: coherence matrix of radio signals <br />usage phys.polarisation.coherenceMatrix;instr<br />tag:Q

_##answer_

_could add Q | phys.polarization.coherenceMatrix | Related to polarization coherence matrix_

_should work for all electromagnetic signals and not only in radio regime_

<em>not compatible to instr branch in the UCD tree <br /></em>

&lt;!--<br /> * Set ALLOWTOPICRENAME = IVOA.TWikiAdminGroup<br />--&gt;
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---+ 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 <br />family: plasma environement <br />proposal: <strong>phys.flux ; phys.charge </strong><br />requires : phys.charge with definition : Electric charge and tag : Q

#concept : electric current density <br />family: plasma environement <br />proposal: <strong>phys.flux ; phys.charge </strong><br />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 <br /> add Q | phys.current | Electric current<br />add Q | phys.current.density | Electric current density_

_benefits : introduces phys.current; this definition is more focused on the requested concept --&gt; implies better assignment_

#concept : Incidence <br />family: Observation geometry ; Illumination conditions <br />proposal: *pos.incidenceAng* <br />requires : <br />definition : Incidence angle<br />tag : Q

#concept: Emergence angle<br />family: Observation geometry ; Illumination conditions

_##answer_ please include figure to illustrate the various required angles

proposal:<strong> pos.emergenceAng</strong><br /> definition : Emergence angle<br />tag : Q

#concept:Azimuth angle<br /> proposal: *pos.azimuthAng* <br />definition : Azimuthal angle<br />tag : Q

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

proposal: <strong>pos.cylindrical.r</strong><br />requires :pos.cylindrical<br />definition : Cylindrical coordinate (radial distance from z-axis)<br />tag : Q<br /> <br /> proposal: <strong>pos.cylindrical.th </strong><br />definition : Cylindrical coordinate (Azimuthal angle around z-axis)<br />tag : Q

proposal: *pos.cylindrical.z* <br />definition : Cylindrical coordinate (height from reference plane)<br />tag : Q

#concept Spherical Coordinates

proposal: <strong>pos.spherical</strong><br />Rationale: not present in UCD tree definition : spherical coordinates <br />tag : S<br /> <br /> proposal:<strong> pos.spherical.r </strong><br />definition : spherical coordinate (radial distance from origin)<br />tag : Q

proposal: *pos.spherical.th* <br />definition : spherical coordinate (colatitude angle)<br />tag : Q

proposal: <strong>pos.spherical.ph </strong><br />definition : spherical coordinate (Azimuth angle)<br />tag : Q

#concept : orbital parameters <br />%Comment perifocal "src.orbital.periastron" exists but is slightly different<br />%Comment periapsis : check variation in meaning <br /> proposal: *src.orbital.periapsis* <br />definition : minimal distance to the center of mass for an orbit<br />tag : P<br /><br /> #concept : rotation params <br /> proposal: *pos.rotation* <br />definition : Relative to rotation <br />tag : S<br /><br /> proposal: <strong>pos.rotation.eulerAngle </strong><br />definition : Euler angles vector <br />tag : V<br /><br />proposal: <strong>pos.rotation.quaternion </strong><br />definition : rotation quaternion vector<br />tag : V<br /> <br />proposal:<strong> pos.rotation.matrix</strong> <br />definition : rotation matrix<br />tag : V<br /><br /> proposal: <strong>pos.rotation.axis </strong><br />definition : rotation axis vector<br />tag : V

#concept: spatial resolution

rationale: linear resolution on cartesian or linear spatial axis as opposed to angular resolution <br />proposal: <strong>pos.resolution </strong><br />definition : Spatial linear resolution (not angular)<br />tag : Q

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

%heliocentric coordinates <br />longitude and latitude can be expressed as <br />proposal: pos.bodyrc.lon;pos.heliocentric <br />proposal: pos.bodyrc.lat;pos.heliocentric <br />% induced changes in assign tool: if heliocentric, or centric except geocentric , --&gt; not earth .... change token<strong> <br /><br /> %metadata branch<br /><br />proposal: meta.checksum</strong> <br />rationale: to check integrity of data <br />definition : numerical signature of digital data <br />tag : Q

_##answer_ _add Q | meta.checksum | Numerical signature of digital data_

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

<br /> # spectroscopic measures<br />#concept : reflectance

proposal: *phys.reflectance* <br />rationale : diff from albedo <br />definition, usage : radiance factor , (received radiance divided by input radiance) , may include thermal emission <br />% annotation master : to check ; consequence : change definition to albedo and remove reflectance <br />% | phys.albedo | Albedo or reflectance<br />derived usage :<br />Radiance Factor : arith.factor;phys.reflectance<br /><br /> _##answer add Q | phys.reflectance | Radiance factor, (received radiance divided by input radiance), may include thermal emission_

proposal: *phys.reflectance.bidirectional* <br />definition : bidirectional reflectance <br />tag : Q

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

proposal: <strong>phys.brdf</strong><br />rationale : specific term as much as psf for the community <br />definition : bidirectional reflectance distribution function <br />tag: Q <br /><br /> _##answer add Q | phys.reflectance.bidirectional.df | Bidirectional reflectance distribution function_

proposal: <strong>phys.reflectance.factor </strong><br />definition : reflectance normalized per direction cosine of incidence angle ??<br />tag : Q

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

<em>nb : check relevance and possible ambiguity with radiance factor... <br /></em>

%for normalized reflectance concept<br /> proposal *arith.ratio;phys.reflectance* <br />definition : reflectance normalized per reflectance at one wavelength <br /><br />#shape of planetary objects<br />this is used to represent the 3D shape of object: a 3D lattice<br /><br /> proposal: <strong>phys.shape</strong><br />definition : 3D shape of a object <br />tag : Q<br />usage : phys.shape;meta.modelled for a 3D shape model<br />usage : phys.shape;pos.bodyrc.alt for elevation or terrain model (distribution of altitude on top of a reference ellipsoid or geoid )<br /><br /># spectral polarization data <br /> #concept :spatial matrix<br />rationale: helps to identify or characterize measurement type

<br />proposal: <strong>phys.polarization.coherenceMatrix</strong><br />definition: coherence matrix of radio signals <br />usage phys.polarisation.coherenceMatrix;instr<br />tag:Q

_##answer_

_could add Q | phys.polarization.coherenceMatrix | Related to polarization coherence matrix of radio signals_

<em>not compatible to instr branch in the UCD tree <br /></em>

&lt;!--<br /> * Set ALLOWTOPICRENAME = IVOA.TWikiAdminGroup<br />--&gt;
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Topic attachments
I	Attachment	History	Action	Size	Date	Who	Comment
jpg	emergence_incidenceAngle.jpg	r1	manage	91.9 K	2017-07-06 - 09:40	MireilleLouys	figure For Angle description from http://www.sciencedirect.com/science/article/pii/S0032063315001786
Topic revision: r20 - 2018-02-21 - BaptisteCecconi
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