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wcsfix.h
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/*============================================================================
WCSLIB 8.4 - an implementation of the FITS WCS standard.
Copyright (C) 1995-2024, Mark Calabretta
This file is part of WCSLIB.
WCSLIB is free software: you can redistribute it and/or modify it under the
terms of the GNU Lesser General Public License as published by the Free
Software Foundation, either version 3 of the License, or (at your option)
any later version.
WCSLIB is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for
more details.
You should have received a copy of the GNU Lesser General Public License
along with WCSLIB. If not, see http://www.gnu.org/licenses.
Author: Mark Calabretta, Australia Telescope National Facility, CSIRO.
http://www.atnf.csiro.au/people/Mark.Calabretta
$Id: wcsfix.h,v 8.4 2024/10/28 13:56:16 mcalabre Exp $
*=============================================================================
*
* WCSLIB 8.4 - C routines that implement the FITS World Coordinate System
* (WCS) standard. Refer to the README file provided with WCSLIB for an
* overview of the library.
*
*
* Summary of the wcsfix routines
* ------------------------------
* Routines in this suite identify and translate various forms of construct
* known to occur in FITS headers that violate the FITS World Coordinate System
* (WCS) standard described in
*
= "Representations of world coordinates in FITS",
= Greisen, E.W., & Calabretta, M.R. 2002, A&A, 395, 1061 (WCS Paper I)
=
= "Representations of celestial coordinates in FITS",
= Calabretta, M.R., & Greisen, E.W. 2002, A&A, 395, 1077 (WCS Paper II)
=
= "Representations of spectral coordinates in FITS",
= Greisen, E.W., Calabretta, M.R., Valdes, F.G., & Allen, S.L.
= 2006, A&A, 446, 747 (WCS Paper III)
=
= "Representations of time coordinates in FITS -
= Time and relative dimension in space",
= Rots, A.H., Bunclark, P.S., Calabretta, M.R., Allen, S.L.,
= Manchester, R.N., & Thompson, W.T. 2015, A&A, 574, A36 (WCS Paper VII)
*
* Repairs effected by these routines range from the translation of
* non-standard values for standard WCS keywords, to the repair of malformed
* coordinate representations. Some routines are also provided to check the
* consistency of pairs of keyvalues that define the same measure in two
* different ways, for example, as a date and an MJD.
*
* A separate routine, wcspcx(), "regularizes" the linear transformation matrix
* component (PCi_j) of the coordinate transformation to make it more human-
* readable. Where a coordinate description was constructed from CDi_j, it
* decomposes it into PCi_j + CDELTi in a meaningful way. Optionally, it can
* also diagonalize the PCi_j matrix (as far as possible), i.e. undo a
* transposition of axes in the intermediate pixel coordinate system.
*
* Non-standard keyvalues:
* -----------------------
* AIPS-convention celestial projection types, NCP and GLS, and spectral
* types, 'FREQ-LSR', 'FELO-HEL', etc., set in CTYPEia are translated
* on-the-fly by wcsset() but without modifying the relevant ctype[], pv[] or
* specsys members of the wcsprm struct. That is, only the information
* extracted from ctype[] is translated when wcsset() fills in wcsprm::cel
* (celprm struct) or wcsprm::spc (spcprm struct).
*
* On the other hand, these routines do change the values of wcsprm::ctype[],
* wcsprm::pv[], wcsprm::specsys and other wcsprm struct members as
* appropriate to produce the same result as if the FITS header itself had
* been translated.
*
* Auxiliary WCS header information not used directly by WCSLIB may also be
* translated. For example, the older DATE-OBS date format (wcsprm::dateobs)
* is recast to year-2000 standard form, and MJD-OBS (wcsprm::mjdobs) will be
* deduced from it if not already set.
*
* Certain combinations of keyvalues that result in malformed coordinate
* systems, as described in Sect. 7.3.4 of Paper I, may also be repaired.
* These are handled by cylfix().
*
* Non-standard keywords:
* ----------------------
* The AIPS-convention CROTAn keywords are recognized as quasi-standard
* and as such are accomodated by wcsprm::crota[] and translated to
* wcsprm::pc[][] by wcsset(). These are not dealt with here, nor are any
* other non-standard keywords since these routines work only on the contents
* of a wcsprm struct and do not deal with FITS headers per se. In
* particular, they do not identify or translate CD00i00j, PC00i00j, PROJPn,
* EPOCH, VELREF or VSOURCEa keywords; this may be done by the FITS WCS
* header parser supplied with WCSLIB, refer to wcshdr.h.
*
* wcsfix() and wcsfixi() apply all of the corrections handled by the following
* specific functions, which may also be invoked separately:
*
* - cdfix(): Sets the diagonal element of the CDi_ja matrix to 1.0 if all
* CDi_ja keywords associated with a particular axis are omitted.
*
* - datfix(): recast an older DATE-OBS date format in dateobs to year-2000
* standard form. Derive dateref from mjdref if not already set.
* Alternatively, if dateref is set and mjdref isn't, then derive mjdref
* from it. If both are set, then check consistency. Likewise for dateobs
* and mjdobs; datebeg and mjdbeg; dateavg and mjdavg; and dateend and
* mjdend.
*
* - obsfix(): if only one half of obsgeo[] is set, then derive the other
* half from it. If both halves are set, then check consistency.
*
* - unitfix(): translate some commonly used but non-standard unit strings in
* the CUNITia keyvalues, e.g. 'DEG' -> 'deg'.
*
* - spcfix(): translate AIPS-convention spectral types, 'FREQ-LSR',
* 'FELO-HEL', etc., in ctype[] as set from CTYPEia.
*
* - celfix(): translate AIPS-convention celestial projection types, NCP and
* GLS, in ctype[] as set from CTYPEia.
*
* - cylfix(): fixes WCS keyvalues for malformed cylindrical projections that
* suffer from the problem described in Sect. 7.3.4 of Paper I.
*
*
* wcsfix() - Translate a non-standard WCS struct
* ----------------------------------------------
* wcsfix() is identical to wcsfixi(), but lacks the info argument.
*
*
* wcsfixi() - Translate a non-standard WCS struct
* -----------------------------------------------
* wcsfixi() applies all of the corrections handled separately by cdfix(),
* datfix(), obsfix(), unitfix(), spcfix(), celfix(), and cylfix().
*
* Given:
* ctrl int Do potentially unsafe translations of non-standard
* unit strings as described in the usage notes to
* wcsutrn().
*
* naxis const int []
* Image axis lengths. If this array pointer is set to
* zero then cylfix() will not be invoked.
*
* Given and returned:
* wcs struct wcsprm*
* Coordinate transformation parameters.
*
* Returned:
* stat int [NWCSFIX]
* Status returns from each of the functions. Use the
* preprocessor macros NWCSFIX to dimension this vector
* and CDFIX, DATFIX, OBSFIX, UNITFIX, SPCFIX, CELFIX,
* and CYLFIX to access its elements. A status value
* of -2 is set for functions that were not invoked.
*
* info struct wcserr [NWCSFIX]
* Status messages from each of the functions. Use the
* preprocessor macros NWCSFIX to dimension this vector
* and CDFIX, DATFIX, OBSFIX, UNITFIX, SPCFIX, CELFIX,
* and CYLFIX to access its elements.
*
* Note that the memory allocated by wcsfixi() for the
* message in each wcserr struct (wcserr::msg, if
* non-zero) must be freed by the user. See
* wcsdealloc().
*
* Function return value:
* int Status return value:
* 0: Success.
* 1: One or more of the translation functions
* returned an error.
*
*
* cdfix() - Fix erroneously omitted CDi_ja keywords
* -------------------------------------------------
* cdfix() sets the diagonal element of the CDi_ja matrix to unity if all
* CDi_ja keywords associated with a given axis were omitted. According to WCS
* Paper I, if any CDi_ja keywords at all are given in a FITS header then those
* not given default to zero. This results in a singular matrix with an
* intersecting row and column of zeros.
*
* cdfix() is expected to be invoked before wcsset(), which will fail if these
* errors have not been corrected.
*
* Given and returned:
* wcs struct wcsprm*
* Coordinate transformation parameters.
*
* Function return value:
* int Status return value:
* -1: No change required (not an error).
* 0: Success.
* 1: Null wcsprm pointer passed.
*
*
* datfix() - Translate DATE-OBS and derive MJD-OBS or vice versa
* --------------------------------------------------------------
* datfix() translates the old DATE-OBS date format set in wcsprm::dateobs to
* year-2000 standard form (yyyy-mm-ddThh:mm:ss). It derives wcsprm::dateref
* from wcsprm::mjdref if not already set. Alternatively, if dateref is set
* and mjdref isn't, then it derives mjdref from it. If both are set but
* disagree by more than 0.001 day (86.4 seconds) then an error status is
* returned. Likewise for wcsprm::dateobs and wcsprm::mjdobs; wcsprm::datebeg
* and wcsprm::mjdbeg; wcsprm::dateavg and wcsprm::mjdavg; and wcsprm::dateend
* and wcsprm::mjdend.
*
* If neither dateobs nor mjdobs are set, but wcsprm::jepoch (primarily) or
* wcsprm::bepoch is, then both are derived from it. If jepoch and/or bepoch
* are set but disagree with dateobs or mjdobs by more than 0.000002 year
* (63.2 seconds), an informative message is produced.
*
* The translations done by datfix() do not affect and are not affected by
* wcsset().
*
* Given and returned:
* wcs struct wcsprm*
* Coordinate transformation parameters.
* wcsprm::dateref and/or wcsprm::mjdref may be changed.
* wcsprm::dateobs and/or wcsprm::mjdobs may be changed.
* wcsprm::datebeg and/or wcsprm::mjdbeg may be changed.
* wcsprm::dateavg and/or wcsprm::mjdavg may be changed.
* wcsprm::dateend and/or wcsprm::mjdend may be changed.
*
* Function return value:
* int Status return value:
* -1: No change required (not an error).
* 0: Success.
* 1: Null wcsprm pointer passed.
* 5: Invalid parameter value.
*
* For returns >= 0, a detailed message, whether
* informative or an error message, may be set in
* wcsprm::err if enabled, see wcserr_enable(), with
* wcsprm::err.status set to FIXERR_DATE_FIX.
*
* Notes:
* 1: The MJD algorithms used by datfix() are from D.A. Hatcher, 1984, QJRAS,
* 25, 53-55, as modified by P.T. Wallace for use in SLALIB subroutines
* CLDJ and DJCL.
*
*
* obsfix() - complete the OBSGEO-[XYZLBH] vector of observatory coordinates
* -------------------------------------------------------------------------
* obsfix() completes the wcsprm::obsgeo vector of observatory coordinates.
* That is, if only the (x,y,z) Cartesian coordinate triplet or the (l,b,h)
* geodetic coordinate triplet are set, then it derives the other triplet from
* it. If both triplets are set, then it checks for consistency at the level
* of 1 metre.
*
* The operations done by obsfix() do not affect and are not affected by
* wcsset().
*
* Given:
* ctrl int Flag that controls behaviour if one triplet is
* defined and the other is only partially defined:
* 0: Reset only the undefined elements of an
* incomplete coordinate triplet.
* 1: Reset all elements of an incomplete triplet.
* 2: Don't make any changes, check for consistency
* only. Returns an error if either of the two
* triplets is incomplete.
*
* Given and returned:
* wcs struct wcsprm*
* Coordinate transformation parameters.
* wcsprm::obsgeo may be changed.
*
* Function return value:
* int Status return value:
* -1: No change required (not an error).
* 0: Success.
* 1: Null wcsprm pointer passed.
* 5: Invalid parameter value.
*
* For returns >= 0, a detailed message, whether
* informative or an error message, may be set in
* wcsprm::err if enabled, see wcserr_enable(), with
* wcsprm::err.status set to FIXERR_OBS_FIX.
*
* Notes:
* 1: While the International Terrestrial Reference System (ITRS) is based
* solely on Cartesian coordinates, it recommends the use of the GRS80
* ellipsoid in converting to geodetic coordinates. However, while WCS
* Paper III recommends ITRS Cartesian coordinates, Paper VII prescribes
* the use of the IAU(1976) ellipsoid for geodetic coordinates, and
* consequently that is what is used here.
*
* 2: For reference, parameters of commonly used global reference ellipsoids:
*
= a (m) 1/f Standard
= --------- ------------- --------------------------------
= 6378140 298.2577 IAU(1976)
= 6378137 298.257222101 GRS80
= 6378137 298.257223563 WGS84
= 6378136 298.257 IERS(1989)
= 6378136.6 298.25642 IERS(2003,2010), IAU(2009/2012)
*
* where f = (a - b) / a is the flattening, and a and b are the semi-major
* and semi-minor radii in metres.
*
* 3: The transformation from geodetic (lng,lat,hgt) to Cartesian (x,y,z) is
*
= x = (n + hgt)*coslng*coslat,
= y = (n + hgt)*sinlng*coslat,
= z = (n*(1.0 - e^2) + hgt)*sinlat,
*
* where the "prime vertical radius", n, is a function of latitude
*
= n = a / sqrt(1 - (e*sinlat)^2),
*
* and a, the equatorial radius, and e^2 = (2 - f)*f, the (first)
* eccentricity of the ellipsoid, are constants. obsfix() inverts these
* iteratively by writing
*
= x = rho*coslng*coslat,
= y = rho*sinlng*coslat,
= zeta = rho*sinlat,
*
* where
*
= rho = n + hgt,
= = sqrt(x^2 + y^2 + zeta^2),
= zeta = z / (1 - n*e^2/rho),
*
* and iterating over the value of zeta. Since e is small, a good first
* approximation is given by zeta = z.
*
*
* unitfix() - Correct aberrant CUNITia keyvalues
* ----------------------------------------------
* unitfix() applies wcsutrn() to translate non-standard CUNITia keyvalues,
* e.g. 'DEG' -> 'deg', also stripping off unnecessary whitespace.
*
* unitfix() is expected to be invoked before wcsset(), which will fail if
* non-standard CUNITia keyvalues have not been translated.
*
* Given:
* ctrl int Do potentially unsafe translations described in the
* usage notes to wcsutrn().
*
* Given and returned:
* wcs struct wcsprm*
* Coordinate transformation parameters.
*
* Function return value:
* int Status return value:
* -1: No change required (not an error).
* 0: Success (an alias was applied).
* 1: Null wcsprm pointer passed.
*
* When units are translated (i.e. 0 is returned), an
* informative message is set in wcsprm::err if enabled,
* see wcserr_enable(), with wcsprm::err.status set to
* FIXERR_UNITS_ALIAS.
*
*
* spcfix() - Translate AIPS-convention spectral types
* ---------------------------------------------------
* spcfix() translates AIPS-convention spectral coordinate types,
* '{FREQ,FELO,VELO}-{LSR,HEL,OBS}' (e.g. 'FREQ-OBS', 'FELO-HEL', 'VELO-LSR')
* set in wcsprm::ctype[], subject to VELREF set in wcsprm::velref.
*
* Note that if wcs::specsys is already set then it will not be overridden.
*
* AIPS-convention spectral types set in CTYPEia are translated on-the-fly by
* wcsset() but without modifying wcsprm::ctype[] or wcsprm::specsys. That is,
* only the information extracted from wcsprm::ctype[] is translated when
* wcsset() fills in wcsprm::spc (spcprm struct). spcfix() modifies
* wcsprm::ctype[] so that if the header is subsequently written out, e.g. by
* wcshdo(), then it will contain translated CTYPEia keyvalues.
*
* The operations done by spcfix() do not affect and are not affected by
* wcsset().
*
* Given and returned:
* wcs struct wcsprm*
* Coordinate transformation parameters. wcsprm::ctype[]
* and/or wcsprm::specsys may be changed.
*
* Function return value:
* int Status return value:
* -1: No change required (not an error).
* 0: Success.
* 1: Null wcsprm pointer passed.
* 2: Memory allocation failed.
* 3: Linear transformation matrix is singular.
* 4: Inconsistent or unrecognized coordinate axis
* types.
* 5: Invalid parameter value.
* 6: Invalid coordinate transformation parameters.
* 7: Ill-conditioned coordinate transformation
* parameters.
*
* For returns >= 0, a detailed message, whether
* informative or an error message, may be set in
* wcsprm::err if enabled, see wcserr_enable(), with
* wcsprm::err.status set to FIXERR_SPC_UPDTE.
*
*
* celfix() - Translate AIPS-convention celestial projection types
* ---------------------------------------------------------------
* celfix() translates AIPS-convention celestial projection types, NCP and
* GLS, set in the ctype[] member of the wcsprm struct.
*
* Two additional pv[] keyvalues are created when translating NCP, and three
* are created when translating GLS with non-zero reference point. If the pv[]
* array was initially allocated by wcsini() then the array will be expanded if
* necessary. Otherwise, error 2 will be returned if sufficient empty slots
* are not already available for use.
*
* AIPS-convention celestial projection types set in CTYPEia are translated
* on-the-fly by wcsset() but without modifying wcsprm::ctype[], wcsprm::pv[],
* or wcsprm::npv. That is, only the information extracted from
* wcsprm::ctype[] is translated when wcsset() fills in wcsprm::cel (celprm
* struct). celfix() modifies wcsprm::ctype[], wcsprm::pv[], and wcsprm::npv
* so that if the header is subsequently written out, e.g. by wcshdo(), then it
* will contain translated CTYPEia keyvalues and the relevant PVi_ma.
*
* The operations done by celfix() do not affect and are not affected by
* wcsset(). However, it uses information in the wcsprm struct provided by
* wcsset(), and will invoke it if necessary.
*
* Given and returned:
* wcs struct wcsprm*
* Coordinate transformation parameters. wcsprm::ctype[]
* and/or wcsprm::pv[] may be changed.
*
* Function return value:
* int Status return value:
* -1: No change required (not an error).
* 0: Success.
* 1: Null wcsprm pointer passed.
* 2: Memory allocation failed.
* 3: Linear transformation matrix is singular.
* 4: Inconsistent or unrecognized coordinate axis
* types.
* 5: Invalid parameter value.
* 6: Invalid coordinate transformation parameters.
* 7: Ill-conditioned coordinate transformation
* parameters.
*
* For returns > 1, a detailed error message is set in
* wcsprm::err if enabled, see wcserr_enable().
*
*
* cylfix() - Fix malformed cylindrical projections
* ------------------------------------------------
* cylfix() fixes WCS keyvalues for malformed cylindrical projections that
* suffer from the problem described in Sect. 7.3.4 of Paper I.
*
* cylfix() requires the wcsprm struct to have been set up by wcsset(), and
* will invoke it if necessary. After modification, the struct is reset on
* return with an explicit call to wcsset().
*
* Given:
* naxis const int []
* Image axis lengths.
*
* Given and returned:
* wcs struct wcsprm*
* Coordinate transformation parameters.
*
* Function return value:
* int Status return value:
* -1: No change required (not an error).
* 0: Success.
* 1: Null wcsprm pointer passed.
* 2: Memory allocation failed.
* 3: Linear transformation matrix is singular.
* 4: Inconsistent or unrecognized coordinate axis
* types.
* 5: Invalid parameter value.
* 6: Invalid coordinate transformation parameters.
* 7: Ill-conditioned coordinate transformation
* parameters.
* 8: All of the corner pixel coordinates are invalid.
* 9: Could not determine reference pixel coordinate.
* 10: Could not determine reference pixel value.
*
* For returns > 1, a detailed error message is set in
* wcsprm::err if enabled, see wcserr_enable().
*
*
* wcspcx() - regularize PCi_j
* ---------------------------
* wcspcx() "regularizes" the linear transformation matrix component of the
* coordinate transformation (PCi_ja) to make it more human-readable.
*
* Normally, upon encountering a FITS header containing a CDi_ja matrix,
* wcsset() simply treats it as PCi_ja and sets CDELTia to unity. However,
* wcspcx() decomposes CDi_ja into PCi_ja and CDELTia in such a way that
* CDELTia form meaningful scaling parameters. In practice, the residual
* PCi_ja matrix will often then be orthogonal, i.e. unity, or describing a
* pure rotation, axis permutation, or reflection, or a combination thereof.
*
* The decomposition is based on normalizing the length in the transformed
* system (i.e. intermediate pixel coordinates) of the orthonormal basis
* vectors of the pixel coordinate system. This deviates slightly from the
* prescription given by Eq. (4) of WCS Paper I, namely Sum(j=1,N)(PCi_ja)² = 1,
* in replacing the sum over j with the sum over i. Consequently, the columns
* of PCi_ja will consist of unit vectors. In practice, especially in cubes
* and higher dimensional images, at least some pairs of these unit vectors, if
* not all, will often be orthogonal or close to orthogonal.
*
* The sign of CDELTia is chosen to make the PCi_ja matrix as close to the,
* possibly permuted, unit matrix as possible, except that where the coordinate
* description contains a pair of celestial axes, the sign of CDELTia is set
* negative for the longitude axis and positive for the latitude axis.
*
* Optionally, rows of the PCi_ja matrix may also be permuted to diagonalize
* it as far as possible, thus undoing any transposition of axes in the
* intermediate pixel coordinate system.
*
* If the coordinate description contains a celestial plane, then the angle of
* rotation of each of the basis vectors associated with the celestial axes is
* returned. For a pure rotation the two angles should be identical. Any
* difference between them is a measure of axis skewness.
*
* The decomposition is not performed for axes involving a sequent distortion
* function that is defined in terms of CDi_ja, such as TPV, TNX, or ZPX, which
* always are. The independent variables of the polynomial are therefore
* intermediate world coordinates rather than intermediate pixel coordinates.
* Because sequent distortions are always applied before CDELTia, if CDi_ja was
* translated to PCi_ja plus CDELTia, then the distortion would be altered
* unless the polynomial coefficients were also adjusted to account for the
* change of scale.
*
* wcspcx() requires the wcsprm struct to have been set up by wcsset(), and
* will invoke it if necessary. The wcsprm struct is reset on return with an
* explicit call to wcsset().
*
* Given and returned:
* wcs struct wcsprm*
* Coordinate transformation parameters.
*
* Given:
* dopc int If 1, then PCi_ja and CDELTia, as given, will be
* recomposed according to the above prescription. If 0,
* the operation is restricted to decomposing CDi_ja.
*
* permute int If 1, then after decomposition (or recomposition),
* permute rows of PCi_ja to make the axes of the
* intermediate pixel coordinate system match as closely
* as possible those of the pixel coordinates. That is,
* make it as close to a diagonal matrix as possible.
* However, celestial axes are special in always being
* paired, with the longitude axis preceding the latitude
* axis.
*
* All WCS entities indexed by i, such as CTYPEia,
* CRVALia, CDELTia, etc., including coordinate lookup
* tables, will also be permuted as necessary to account
* for the change to PCi_ja. This does not apply to
* CRPIXja, nor prior distortion functions. These
* operate on pixel coordinates, which are not affected
* by the permutation.
*
* Returned:
* rotn double[2] Rotation angle [deg] of each basis vector associated
* with the celestial axes. For a pure rotation the two
* angles should be identical. Any difference between
* them is a measure of axis skewness.
*
* May be set to the NULL pointer if this information is
* not required.
*
* Function return value:
* int Status return value:
* 0: Success.
* 1: Null wcsprm pointer passed.
* 2: Memory allocation failed.
* 5: CDi_j matrix not used.
* 6: Sequent distortion function present.
*
*
* Global variable: const char *wcsfix_errmsg[] - Status return messages
* ---------------------------------------------------------------------
* Error messages to match the status value returned from each function.
*
*===========================================================================*/
#ifndef WCSLIB_WCSFIX
#define WCSLIB_WCSFIX
#include "wcs.h"
#include "wcserr.h"
#ifdef __cplusplus
extern "C" {
#endif
#define CDFIX 0
#define DATFIX 1
#define OBSFIX 2
#define UNITFIX 3
#define SPCFIX 4
#define CELFIX 5
#define CYLFIX 6
#define NWCSFIX 7
extern const char *wcsfix_errmsg[];
#define cylfix_errmsg wcsfix_errmsg
enum wcsfix_errmsg_enum {
FIXERR_OBSGEO_FIX = -5, // Observatory coordinates amended.
FIXERR_DATE_FIX = -4, // Date string reformatted.
FIXERR_SPC_UPDATE = -3, // Spectral axis type modified.
FIXERR_UNITS_ALIAS = -2, // Units alias translation.
FIXERR_NO_CHANGE = -1, // No change.
FIXERR_SUCCESS = 0, // Success.
FIXERR_NULL_POINTER = 1, // Null wcsprm pointer passed.
FIXERR_MEMORY = 2, // Memory allocation failed.
FIXERR_SINGULAR_MTX = 3, // Linear transformation matrix is singular.
FIXERR_BAD_CTYPE = 4, // Inconsistent or unrecognized coordinate
// axis types.
FIXERR_BAD_PARAM = 5, // Invalid parameter value.
FIXERR_BAD_COORD_TRANS = 6, // Invalid coordinate transformation
// parameters.
FIXERR_ILL_COORD_TRANS = 7, // Ill-conditioned coordinate transformation
// parameters.
FIXERR_BAD_CORNER_PIX = 8, // All of the corner pixel coordinates are
// invalid.
FIXERR_NO_REF_PIX_COORD = 9, // Could not determine reference pixel
// coordinate.
FIXERR_NO_REF_PIX_VAL = 10 // Could not determine reference pixel value.
};
int wcsfix(int ctrl, const int naxis[], struct wcsprm *wcs, int stat[]);
int wcsfixi(int ctrl, const int naxis[], struct wcsprm *wcs, int stat[],
struct wcserr info[]);
int cdfix(struct wcsprm *wcs);
int datfix(struct wcsprm *wcs);
int obsfix(int ctrl, struct wcsprm *wcs);
int unitfix(int ctrl, struct wcsprm *wcs);
int spcfix(struct wcsprm *wcs);
int celfix(struct wcsprm *wcs);
int cylfix(const int naxis[], struct wcsprm *wcs);
int wcspcx(struct wcsprm *wcs, int dopc, int permute, double rotn[2]);
#ifdef __cplusplus
}
#endif
#endif // WCSLIB_WCSFIX
wcserr
Error message handling.
Definition wcserr.h:243
wcsprm
Coordinate transformation parameters.
Definition wcs.h:2134
wcs.h
wcserr.h
wcsfix_errmsg_enum
wcsfix_errmsg_enum
Definition wcsfix.h:606
FIXERR_NO_REF_PIX_VAL
@ FIXERR_NO_REF_PIX_VAL
Definition wcsfix.h:627
FIXERR_UNITS_ALIAS
@ FIXERR_UNITS_ALIAS
Definition wcsfix.h:610
FIXERR_OBSGEO_FIX
@ FIXERR_OBSGEO_FIX
Definition wcsfix.h:607
FIXERR_MEMORY
@ FIXERR_MEMORY
Definition wcsfix.h:614
FIXERR_DATE_FIX
@ FIXERR_DATE_FIX
Definition wcsfix.h:608
FIXERR_BAD_PARAM
@ FIXERR_BAD_PARAM
Definition wcsfix.h:618
FIXERR_BAD_CORNER_PIX
@ FIXERR_BAD_CORNER_PIX
Definition wcsfix.h:623
FIXERR_BAD_CTYPE
@ FIXERR_BAD_CTYPE
Definition wcsfix.h:616
FIXERR_BAD_COORD_TRANS
@ FIXERR_BAD_COORD_TRANS
Definition wcsfix.h:619
FIXERR_SPC_UPDATE
@ FIXERR_SPC_UPDATE
Definition wcsfix.h:609
FIXERR_ILL_COORD_TRANS
@ FIXERR_ILL_COORD_TRANS
Definition wcsfix.h:621
FIXERR_SINGULAR_MTX
@ FIXERR_SINGULAR_MTX
Definition wcsfix.h:615
FIXERR_NO_REF_PIX_COORD
@ FIXERR_NO_REF_PIX_COORD
Definition wcsfix.h:625
FIXERR_NO_CHANGE
@ FIXERR_NO_CHANGE
Definition wcsfix.h:611
FIXERR_SUCCESS
@ FIXERR_SUCCESS
Definition wcsfix.h:612
FIXERR_NULL_POINTER
@ FIXERR_NULL_POINTER
Definition wcsfix.h:613
cylfix
int cylfix(const int naxis[], struct wcsprm *wcs)
Fix malformed cylindrical projections.
cdfix
int cdfix(struct wcsprm *wcs)
Fix erroneously omitted CDi_ja keywords.
obsfix
int obsfix(int ctrl, struct wcsprm *wcs)
complete the OBSGEO-[XYZLBH] vector of observatory coordinates.
wcsfixi
int wcsfixi(int ctrl, const int naxis[], struct wcsprm *wcs, int stat[], struct wcserr info[])
Translate a non-standard WCS struct.
datfix
int datfix(struct wcsprm *wcs)
Translate DATE-OBS and derive MJD-OBS or vice versa.
wcspcx
int wcspcx(struct wcsprm *wcs, int dopc, int permute, double rotn[2])
regularize PCi_j.
unitfix
int unitfix(int ctrl, struct wcsprm *wcs)
Correct aberrant CUNITia keyvalues.
wcsfix
int wcsfix(int ctrl, const int naxis[], struct wcsprm *wcs, int stat[])
Translate a non-standard WCS struct.
wcsfix_errmsg
const char * wcsfix_errmsg[]
Status return messages.
celfix
int celfix(struct wcsprm *wcs)
Translate AIPS-convention celestial projection types.
spcfix
int spcfix(struct wcsprm *wcs)
Translate AIPS-convention spectral types.