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: http://www.adass.org/adass/proceedings/adass03/P4-12/
Дата изменения: Fri Aug 27 18:08:35 2004 Дата индексирования: Tue Oct 2 05:32:44 2012 Кодировка: Поисковые слова: р п р п р п р п р п р п р п р п р п р п р п р п р п р п р п р п р п р п р п р п р п р п р п р п р п |
Feature | Status |
---|---|
Axis distortions (as described in paper IV) |
Ignored (except for the SIRTF-specific ``-SIP'' code which is interpreted correctly when reading a FITS header, but is never written out to a new FITS header). |
Alternate axis descriptions |
Supported |
User-defined fiducial points |
Supported |
Choice of PCi_ja or CDi_ja matrix |
Supported |
Deprecated WCS conventions (e.g. keyword CROTAi, EPOCH, PCiiijjj, the NCP projection, etc.) |
Supported |
Alternate keyword formats for inclusion in tables |
Unsupported |
Units in comment strings |
Unsupported |
Uncertainties in the coordinates |
Unsupported |
``WCSDEP'' convention |
Unsupported |
Use of longitude projection parameters to store LONPOLE and LATPOLE |
Supported |
Common, non-standard features |
Support for reading (but not writing) various common, non-standard feature such as ``TNX'' and ``ZPX'' projections is included. More can easily be added as requested. |
Keyword | Description | Status |
---|---|---|
WCSAXESa |
WCS dimensionality | Supported |
CRVALia |
Value at reference point | Supported |
CRPIXja |
Pixel of reference point | Supported |
CDELTia |
Increment at reference point | Supported |
CROTAi |
Rotation at reference point | Supported (only written when producing a ``FITS-AIPS'' header) |
CTYPEia |
Coordinate/algorithm/distortion type | Supported (all coordinate systems [including helio-ecliptic] and algorithm codes listed in papers I, II and III, with the exception of the ``STOKES'' and ``COMPLEX'' values defined in paper I, the ``CUBEFACE'' value defined in paper II, and the ``-TAB'' algorithm defined in paper III) |
CUNITia |
Units of coordinate values | Supported (including automatic unit conversion if the units strings conform to paper I conventions) |
PCi_ja |
Transformation matrix | Supported |
CDi_ja |
Transformation matrix | Supported |
PVi_ma |
Algorithm numerical parameter | Supported |
PSi_ma |
Algorithm textual parameter | Unsupported |
WCSNAMEa |
Coordinate version name | Supported |
CRDERia |
Random error | Unsupported |
CSYERia |
Systematic error | Unsupported |
LONPOLEa |
Coordinate rotation (celestial axes) | Supported |
LATPOLEa |
Coordinate rotation (celestial axes) | Supported |
RADESYSa |
Frame of reference (celestial axes) | Supported (all systems, except ecliptic coordinates are currently assumed to be FK5) |
EQUINOXa |
Coordinate epoch (celestial axes) | Supported |
EPOCH |
Coordinate epoch (celestial axes) | Supported (only written when producing a ``FITS-AIPS'' header) |
MJD-OBS |
Time of observation | Supported |
SPECSYSa |
Spectral reference frame | Supported (all systems, except CMBDIPOL) |
SSYSOBSa |
Spectral reference frame fixed during observation | Unsupported |
OBSGEO-X/Y/Z |
Observation position | Supported |
MJD-AVG |
Average date of observation | Supported |
VSOURCEa |
Physical velocity of source for SPECSYS=SOURCE cases | Supported |
ZSOURCEa |
Optical velocity of source for SPECSYS=SOURCE cases | Supported |
VELOSYSa |
Velocity w.r.t. standard of rest | Unsupported |
RESTFRQa |
Line rest frequency | Supported |
RESTWAVa |
Line rest wavelength in vacuum | Supported |
CNAMEia |
Descriptive axis label | Supported |
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