A CoordFrame has to have at least a name CoordFrame substitution group head element A CoordSys consists of at least one coordinate frames Coordinate equinox: B{year} or J{year} with at least one decimal; do not use in conjunction with ICRS Abstract space reference frame type ICRStype FK[45] type A custome space reference frame type Define coordinate reference frame from scratch; pole and X-axis need to be defined in a known coordinate system Head element for the Coordinate reference frame substitution group: optional equinox with either a standard reference system (ICRS, FK5, FK4) and optional standard pole (equatorial, ecliptic, galactic, etc.), or a custom frame with pole (positive Z-axis) and positive X-axis direction The ICRS reference frame FK4; needs a Besselian epoch FK5; needs a Julian epoch Ecliptic coorindates; needs an epoch Galactic coordinates; first system Galactic coordinates; second system SuperGalactic coordinates Local Azimuth and Elevation coordinates Generic Body coordinates The Geographic reference frame The Geodetic reference frame The Geomagnetic reference frame The Geocentric Solar Ecliptic reference frame The Geocentric Solar Magnetic reference frame The Solar Magnetic reference frame The Heliographic reference frame The Heliocentric Earth Ecliptic reference frame The Heliocentric Earth Equatorial reference frame The Heliocentric Inertial reference frame The Heliocentric of Date reference frame The planetocentric reference frame anchored on Mercury The planetocentric reference frame anchored on Venus The lunacentric reference frame anchored on the moon The planetocentric reference frame anchored on Mars The planetocentric reference frame anchored on Jupiter The planetocentric reference frame anchored on Saturn The planetocentric reference frame anchored on Uranus The planetocentric reference frame anchored on Neptune The planetocentric reference frame anchored on Pluto The planetographic reference frame anchored on Mercury The planetographic reference frame anchored on Venus The lunagraphic reference frame anchored on the moon The planetographic reference frame anchored on Mars The planetographic reference frame anchored on Jupiter The planetographic reference frame anchored on Saturn The planetographic reference frame anchored on Uranus The planetographic reference frame anchored on Neptune The planetographic reference frame anchored on Pluto Coordinate reference frame: a custom pole (positive Z-axis) and positive X-axis direction If solar system positions are implied anywhere, the planetary ephemeris to be used needs to be provided - usually JPL-DE405 with ICRS and JPL-DE200 with FK5 Abstract type for reference positions Type for standard reference positions Type for custom positions: specifies reference origin Head element from the ReferencePosition substitution group: either a "known place" such as geocenter or barycenter (RefPos), or a position defined in a known coordinate system (CoordOrigin) Location of the observer/telescope Barycenter of the solar system Center of the sun Center of the earth Local Standard of Rest (only used for Doppler velocities) Center of the Galaxy Center of the Local Super Cluster Center of the Moon Barycenter of the Earth-Moon system Center of Mercury Center of Venus Center of Mars Center of Jupiter Center of Saturn Center of Uranus Center of Neptune Center of Pluto A relocatable origin, especially useful for simulations Origin of the coordinate system, given as a position in another, known, coordinate system Provides the coordinate definitions: number of axes, SPHERICAL, CARTESIAN, or UNITSPHERE, presence of velocities Abstract head element for the CoordFlavor substitution group Spherical (2-D) coordinates Cartesian 1-, 2-, or 3-D coordinates 3-D Unit sphere coordinates (direction cosines) 3-D geographic-like spherical coordinates (longitude, latitude, altitude) A spatial coordinate frame consists of a coordinate frame and a reference position Coordinate reference frame: optional equinox with either a standard reference system (ICRS, FK5, FK4) and optional standard pole (equatorial, ecliptic, galactic, etc.), or pole (positive Z-axis) and positive X-axis direction Origin of the coordinate reference frame: either a "known place" such as geocenter or barycenter, or a position defined in a known coordinate system Provides the coordinate definitions: number of axes, SPHERICAL or CARTESIAN, presence of velocities, and the Doppler definitions (if needed) The time reference frame consists of a timescale, a reference position, and optionally a reference direction (needed when transformations have been applied) The time reference frame consists of a time scale, a time format, and a reference time, if needed Origin of the coordinate reference frame: either a "known place" such as geocenter or barycenter, or a position defined in a known coordinate system Some time transformations (e.g., change of RefPos) depend on an assumed directonal position of the source Contains the spectral frame reference position The reference frame for the Doppler velocities; note presence of LSR The Doppler definition used: optical, radio, or pseudo-relativistic (i.e., how is a redshift converted to a velocity); the most common is optical, except when the reference is LSR (usually radio) Contains the Doppler definitions, including whether the values are velocity or redshift (value_type) The Doppler definition used: optical, radio, or pseudo-relativistic (i.e., how is a redshift converted to a velocity); the most common is optical, except when the reference is LSR (usually radio) The reference frame for the Doppler velocities; note presence of LSR The time coordinate reference frame The spatial coordinate reference frame The reference frame for the spectral coordinate; note presence of LSR Contains the Doppler definitions, including whether the values are velocity or redshift (value_type) Head element for Coordinate Frames The astroniomical coordinate system definition: spatial coordinate frame and reference position; time frame and reference position; the coordinate flavor; spectral frame and (optionally) Doppler frame; and the planetary ephemeris; an ID is required, since this is how coordinate elements are associated with their coordinate systems AstroCoordSystem: the real article The time interval needs to contain a start time or a stop time or both; it needs to refer to a coordinate system; boundaries may or may not be inclusive astronTime may be expressed in ISO8601 or as a double relative to a reference time; or it may be provided in an entity refered to by the Reference element astronTime may be expressed in ISO8601 or as a double relative to a reference time; or it may be provided in an entity refered to by the Reference element Abstact coordinate interval type Scalar coordinate interval type A scalar coordinate value consists of a double or a reference to an entity (that should contain a double) A scalar coordinate value consists of a double or a reference to an entity (that should contain a double) 2-D coordinate interval type 3-D coordinate interval type The spatial coordinate interval substitution group head element; such an element needs to contain a minimum or maximum scalar or vector value, or both; it needs to refer to a coordinate system; boundaries may or may not be inclusive; and it can have a fill factor An interval in a scalar coordinate An interval ("box") in a 2-D coordinate pair An interval ("cube") in a 3-D coordinate triplet Substitution group for spatial intervals Defines a sphere Defines a velocity sphere A special kind of area is a circle or sphere (in two or three dimensions), defined by a center position and a radius; the radius requires a unit Contains an abstract CoordInterval Contains an abstract CoordInterval A special kind of area is a circle or sphere (in two or three dimensions), defined by a center position and a radius; the radius requires a unit Points to a Region file Contains an abstract Region The spatial interval substitution group head element; a spatial coordinate interval (volume) is specified as a circle (cone) or sphere; a 1-D, 2-D, or 3-D interval; a Region; or a RegionFile Defines a sphere (3-D) region for spatial coordinates; contains a center position and a radius Contains a CoordInterval element: a 1-D range, 2-D box, or 3-D cube A region as defined in a FITS region file Contains a region as defined in the Region schema Contains a Velocity CoordInterval element: a 1-D range, 2-D box, or 3-D cube; plus a time unit for velocity values Defines a sphere (3-D) region for velocity coordinates; contains a center position and a radius Contains a CoordInterval element: a 1-D range, 2-D box, or 3-D cube An astronomical coordinate area consists of a time interval, a spatial area, a velocity interval, and a redshift interval (as needed); the spatial and velocity areas may be specified by an interval, a sphere, a region element, or a region file Abstract stcMetadata type Type for STC Resource Profile The coordinate system definition: spatial coordinate frame and reference position; time frame and reference position; the coordinate flavor; and the planetary ephemeris; an ID is required, since this is how coordinate elements are associated with their coordinate systems The coverage area of the resource; the fill factor does not need to be 1.0 CoordSpec contains information on time and spatial resolution, errors, and pixelsizes (if fixed); typical best numbers are expected Type for STC search location The coordinate system definition: spatial coordinate frame and reference position; time frame and reference position; the coordinate flavor; and the planetary ephemeris; an ID is required, since this is how coordinate elements are associated with their coordinate systems Region of Interest CoordSpec contains information on desired time and spatial resolution, errors, and pixelsizes (if fixed); typical best numbers are expected Type for STC catalog entry description The coordinate system definition: spatial coordinate frame and reference position; time frame and reference position; the coordinate flavor; and the planetary ephemeris; an ID is required, since this is how coordinate elements are associated with their coordinate systems The coordinate element consists either of a coordinate file or a sequence of time element, spatial coordinate element, velocity element, and redshift element; the spatial and velocity elements may be scalar or vector; it needs to refer to a coordinate system Optional specification of the area covered by the catalog data Type for observational STC metadata Describes the spatial and temporal volume covered by an observation Specifies the location of the observatory during the observation The coordinate system definition: spatial coordinate frame and reference position; time frame and reference position; the coordinate flavor; and the planetary ephemeris; an ID is required, since this is how coordinate elements are associated with their coordinate systems The coordinate element consists either of a coordinate file or a sequence of time element, spatial coordinate element, velocity element, and redshift element; the spatial and velocity elements may be scalar or vector; it needs to refer to a coordinate system Describes the spatial and temporal coverage of the observation The coordinate system definition: spatial coordinate frame and reference position; time frame and reference position; the coordinate flavor; and the planetary ephemeris; an ID is required, since this is how coordinate elements are associated with their coordinate systems The coordinate element consists either of a coordinate file or a sequence of time element, spatial coordinate element, velocity element, and redshift element; the spatial and velocity elements may be scalar or vector; it needs to refer to a coordinate system The field of view Toplevel: STCmetadata contains a choice of: ResourceProfile, SearchLocation, CatalogEntryLocation, or ObservationLocation plus ObservatoryLocation elements Describes the spatial and temporal coverage of a resource Defines the spatial and temporal coordinate space specified by a query Describes the spatial and temporal coverage of a catalog (fragment) Describes the coordinate system used in and coordinate space occupied by a particular observational dataset; it contains an observation location and an observatory location