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WCSLIB 4.20 - an implementation of the FITS WCS standard.
Copyright (C) 1995-2013, 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.
Direct correspondence concerning WCSLIB to mark@calabretta.id.au
Author: Mark Calabretta, Australia Telescope National Facility, CSIRO.
http://www.atnf.csiro.au/people/Mark.Calabretta
$Id: wcshdr.h,v 4.20 2013/12/18 05:42:49 mcalabre Exp $
*=============================================================================
*
* WCSLIB 4.20 - C routines that implement the FITS World Coordinate System
* (WCS) standard. Refer to
*
* "Representations of world coordinates in FITS",
* Greisen, E.W., & Calabretta, M.R. 2002, A&A, 395, 1061 (Paper I)
*
* "Representations of celestial coordinates in FITS",
* Calabretta, M.R., & Greisen, E.W. 2002, A&A, 395, 1077 (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 (Paper III)
*
* Refer to the README file provided with WCSLIB for an overview of the
* library.
*
*
* Summary of the wcshdr routines
* ------------------------------
* Routines in this suite are aimed at extracting WCS information from a FITS
* file. They provide the high-level interface between the FITS file and the
* WCS coordinate transformation routines.
*
* Additionally, function wcshdo() is provided to write out the contents of a
* wcsprm struct as a FITS header.
*
* Briefly, the anticipated sequence of operations is as follows:
*
* - 1: Open the FITS file and read the image or binary table header, e.g.
* using CFITSIO routine fits_hdr2str().
*
* - 2: Parse the header using wcspih() or wcsbth(); they will automatically
* interpret 'TAB' header keywords using wcstab().
*
* - 3: Allocate memory for, and read 'TAB' arrays from the binary table
* extension, e.g. using CFITSIO routine fits_read_wcstab() - refer to
* the prologue of getwcstab.h. wcsset() will automatically take
* control of this allocated memory, in particular causing it to be
* free'd by wcsfree().
*
* - 4: Translate non-standard WCS usage using wcsfix(), see wcsfix.h.
*
* - 5: Initialize wcsprm struct(s) using wcsset() and calculate coordinates
* using wcsp2s() and/or wcss2p(). Refer to the prologue of wcs.h for a
* description of these and other high-level WCS coordinate
* transformation routines.
*
* - 6: Clean up by freeing memory with wcsvfree().
*
* In detail:
*
* - wcspih() is a high-level FITS WCS routine that parses an image header. It
* returns an array of up to 27 wcsprm structs on each of which it invokes
* wcstab().
*
* - wcsbth() is the analogue of wcspih() for use with binary tables; it
* handles image array and pixel list keywords. As an extension of the FITS
* WCS standard, it also recognizes image header keywords which may be used
* to provide default values via an inheritance mechanism.
*
* - wcstab() assists in filling in members of the wcsprm struct associated
* with coordinate lookup tables ('TAB'). These are based on arrays stored
* in a FITS binary table extension (BINTABLE) that are located by PVi_ma
* keywords in the image header.
*
* - wcsidx() and wcsbdx() are utility routines that return the index for a
* specified alternate coordinate descriptor in the array of wcsprm structs
* returned by wcspih() or wcsbth().
*
* - wcsvfree() deallocates memory for an array of wcsprm structs, such as
* returned by wcspih() or wcsbth().
*
* - wcshdo() writes out a wcsprm struct as a FITS header.
*
*
* wcspih() - FITS WCS parser routine for image headers
* ----------------------------------------------------
* wcspih() is a high-level FITS WCS routine that parses an image header,
* either that of a primary HDU or of an image extension. All WCS keywords
* defined in Papers I, II, and III are recognized, and also those used by the
* AIPS convention and certain other keywords that existed in early drafts of
* the WCS papers as explained in wcsbth() note 5.
*
* Given a character array containing a FITS image header, wcspih() identifies
* and reads all WCS keywords for the primary coordinate representation and up
* to 26 alternate representations. It returns this information as an array of
* wcsprm structs.
*
* wcspih() invokes wcstab() on each of the wcsprm structs that it returns.
*
* Use wcsbth() in preference to wcspih() for FITS headers of unknown type;
* wcsbth() can parse image headers as well as binary table and pixel list
* headers.
*
* Given and returned:
* header char[] Character array containing the (entire) FITS image
* header from which to identify and construct the
* coordinate representations, for example, as might be
* obtained conveniently via the CFITSIO routine
* fits_hdr2str().
*
* Each header "keyrecord" (formerly "card image")
* consists of exactly 80 7-bit ASCII printing characters
* in the range 0x20 to 0x7e (which excludes NUL, BS,
* TAB, LF, FF and CR) especially noting that the
* keyrecords are NOT null-terminated.
*
* For negative values of ctrl (see below), header[] is
* modified so that WCS keyrecords processed by wcspih()
* are removed from it.
*
* Given:
* nkeyrec int Number of keyrecords in header[].
*
* relax int Degree of permissiveness:
* 0: Recognize only FITS keywords defined by the
* published WCS standard.
* WCSHDR_all: Admit all recognized informal
* extensions of the WCS standard.
* Fine-grained control of the degree of permissiveness
* is also possible as explained in wcsbth() note 5.
*
* ctrl int Error reporting and other control options for invalid
* WCS and other header keyrecords:
* 0: Do not report any rejected header keyrecords.
* 1: Produce a one-line message stating the number
* of WCS keyrecords rejected (nreject).
* 2: Report each rejected keyrecord and the reason
* why it was rejected.
* 3: As above, but also report all non-WCS
* keyrecords that were discarded, and the number
* of coordinate representations (nwcs) found.
* The report is written to stderr by default, or the
* stream set by wcsprintf_set().
*
* For ctrl < 0, WCS keyrecords processed by wcspih()
* are removed from header[]:
* -1: Remove only valid WCS keyrecords whose values
* were successfully extracted, nothing is
* reported.
* -2: Also remove WCS keyrecords that were rejected,
* reporting each one and the reason that it was
* rejected.
* -3: As above, and also report the number of
* coordinate representations (nwcs) found.
* -11: Same as -1 but preserving the basic keywords
* '{DATE,MJD}-{OBS,AVG}' and 'OBSGEO-{X,Y,Z}'.
* If any keyrecords are removed from header[] it will
* be null-terminated (NUL not being a legal FITS header
* character), otherwise it will contain its original
* complement of nkeyrec keyrecords and possibly not be
* null-terminated.
*
* Returned:
* nreject int* Number of WCS keywords rejected for syntax errors,
* illegal values, etc. Keywords not recognized as WCS
* keywords are simply ignored. Refer also to wcsbth()
* note 5.
*
* nwcs int* Number of coordinate representations found.
*
* wcs struct wcsprm**
* Pointer to an array of wcsprm structs containing up to
* 27 coordinate representations.
*
* Memory for the array is allocated by wcspih() which
* also invokes wcsini() for each struct to allocate
* memory for internal arrays and initialize their
* members to default values. Refer also to wcsbth()
* note 8. Note that wcsset() is not invoked on these
* structs.
*
* This allocated memory must be freed by the user, first
* by invoking wcsfree() for each struct, and then by
* freeing the array itself. A routine, wcsvfree(), is
* provided to do this (see below).
*
* Function return value:
* int Status return value:
* 0: Success.
* 1: Null wcsprm pointer passed.
* 2: Memory allocation failed.
* 4: Fatal error returned by Flex parser.
*
* Notes:
* Refer to wcsbth() notes 1, 2, 3, 5, 7, and 8.
*
*
* wcsbth() - FITS WCS parser routine for binary table and image headers
* ---------------------------------------------------------------------
* wcsbth() is a high-level FITS WCS routine that parses a binary table header.
* It handles image array and pixel list WCS keywords which may be present
* together in one header.
*
* As an extension of the FITS WCS standard, wcsbth() also recognizes image
* header keywords in a binary table header. These may be used to provide
* default values via an inheritance mechanism discussed in note 5 (c.f.
* WCSHDR_AUXIMG and WCSHDR_ALLIMG), or may instead result in wcsprm structs
* that are not associated with any particular column. Thus wcsbth() can
* handle primary image and image extension headers in addition to binary table
* headers (it ignores NAXIS and does not rely on the presence of the TFIELDS
* keyword).
*
* All WCS keywords defined in Papers I, II, and III are recognized, and also
* those used by the AIPS convention and certain other keywords that existed in
* early drafts of the WCS papers as explained in note 5 below.
*
* wcsbth() sets the colnum or colax[] members of the wcsprm structs that it
* returns with the column number of an image array or the column numbers
* associated with each pixel coordinate element in a pixel list. wcsprm
* structs that are not associated with any particular column, as may be
* derived from image header keywords, have colnum == 0.
*
* Note 6 below discusses the number of wcsprm structs returned by wcsbth(),
* and the circumstances in which image header keywords cause a struct to be
* created. See also note 9 concerning the number of separate images that may
* be stored in a pixel list.
*
* The API to wcsbth() is similar to that of wcspih() except for the addition
* of extra arguments that may be used to restrict its operation. Like
* wcspih(), wcsbth() invokes wcstab() on each of the wcsprm structs that it
* returns.
*
* Given and returned:
* header char[] Character array containing the (entire) FITS binary
* table, primary image, or image extension header from
* which to identify and construct the coordinate
* representations, for example, as might be obtained
* conveniently via the CFITSIO routine fits_hdr2str().
*
* Each header "keyrecord" (formerly "card image")
* consists of exactly 80 7-bit ASCII printing
* characters in the range 0x20 to 0x7e (which excludes
* NUL, BS, TAB, LF, FF and CR) especially noting that
* the keyrecords are NOT null-terminated.
*
* For negative values of ctrl (see below), header[] is
* modified so that WCS keyrecords processed by wcsbth()
* are removed from it.
*
* Given:
* nkeyrec int Number of keyrecords in header[].
*
* relax int Degree of permissiveness:
* 0: Recognize only FITS keywords defined by the
* published WCS standard.
* WCSHDR_all: Admit all recognized informal
* extensions of the WCS standard.
* Fine-grained control of the degree of permissiveness
* is also possible, as explained in note 5 below.
*
* ctrl int Error reporting and other control options for invalid
* WCS and other header keyrecords:
* 0: Do not report any rejected header keyrecords.
* 1: Produce a one-line message stating the number
* of WCS keyrecords rejected (nreject).
* 2: Report each rejected keyrecord and the reason
* why it was rejected.
* 3: As above, but also report all non-WCS
* keyrecords that were discarded, and the number
* of coordinate representations (nwcs) found.
* The report is written to stderr by default, or the
* stream set by wcsprintf_set().
*
* For ctrl < 0, WCS keyrecords processed by wcsbth()
* are removed from header[]:
* -1: Remove only valid WCS keyrecords whose values
* were successfully extracted, nothing is
* reported.
* -2: Also remove WCS keyrecords that were rejected,
* reporting each one and the reason that it was
* rejected.
* -3: As above, and also report the number of
* coordinate representations (nwcs) found.
* -11: Same as -1 but preserving the basic keywords
* '{DATE,MJD}-{OBS,AVG}' and 'OBSGEO-{X,Y,Z}'.
* If any keyrecords are removed from header[] it will
* be null-terminated (NUL not being a legal FITS header
* character), otherwise it will contain its original
* complement of nkeyrec keyrecords and possibly not be
* null-terminated.
*
* keysel int Vector of flag bits that may be used to restrict the
* keyword types considered:
* WCSHDR_IMGHEAD: Image header keywords.
* WCSHDR_BIMGARR: Binary table image array.
* WCSHDR_PIXLIST: Pixel list keywords.
* If zero, there is no restriction.
*
* Keywords such as EQUIna or RFRQna that are common to
* binary table image arrays and pixel lists (including
* WCSNna and TWCSna, as explained in note 4 below) are
* selected by both WCSHDR_BIMGARR and WCSHDR_PIXLIST.
* Thus if inheritance via WCSHDR_ALLIMG is enabled as
* discussed in note 5 and one of these shared keywords
* is present, then WCSHDR_IMGHEAD and WCSHDR_PIXLIST
* alone may be sufficient to cause the construction of
* coordinate descriptions for binary table image arrays.
*
* colsel int* Pointer to an array of table column numbers used to
* restrict the keywords considered by wcsbth().
*
* A null pointer may be specified to indicate that there
* is no restriction. Otherwise, the magnitude of
* cols[0] specifies the length of the array:
* cols[0] > 0: the columns are included,
* cols[0] < 0: the columns are excluded.
*
* For the pixel list keywords TPn_ka and TCn_ka (and
* TPCn_ka and TCDn_ka if WCSHDR_LONGKEY is enabled), it
* is an error for one column to be selected but not the
* other. This is unlike the situation with invalid
* keyrecords, which are simply rejected, because the
* error is not intrinsic to the header itself but
* arises in the way that it is processed.
*
* Returned:
* nreject int* Number of WCS keywords rejected for syntax errors,
* illegal values, etc. Keywords not recognized as WCS
* keywords are simply ignored, refer also to note 5
* below.
*
* nwcs int* Number of coordinate representations found.
*
* wcs struct wcsprm**
* Pointer to an array of wcsprm structs containing up
* to 27027 coordinate representations, refer to note 6
* below.
*
* Memory for the array is allocated by wcsbth() which
* also invokes wcsini() for each struct to allocate
* memory for internal arrays and initialize their
* members to default values. Refer also to note 8
* below. Note that wcsset() is not invoked on these
* structs.
*
* This allocated memory must be freed by the user, first
* by invoking wcsfree() for each struct, and then by
* freeing the array itself. A routine, wcsvfree(), is
* provided to do this (see below).
*
* Function return value:
* int Status return value:
* 0: Success.
* 1: Null wcsprm pointer passed.
* 2: Memory allocation failed.
* 3: Invalid column selection.
* 4: Fatal error returned by Flex parser.
*
* Notes:
* 1: wcspih() determines the number of coordinate axes independently for
* each alternate coordinate representation (denoted by the "a" value in
* keywords like CTYPEia) from the higher of
*
* a: NAXIS,
* b: WCSAXESa,
* c: The highest axis number in any parameterized WCS keyword. The
* keyvalue, as well as the keyword, must be syntactically valid
* otherwise it will not be considered.
*
* If none of these keyword types is present, i.e. if the header only
* contains auxiliary WCS keywords for a particular coordinate
* representation, then no coordinate description is constructed for it.
*
* wcsbth() is similar except that it ignores the NAXIS keyword if given
* an image header to process.
*
* The number of axes, which is returned as a member of the wcsprm
* struct, may differ for different coordinate representations of the
* same image.
*
* 2: wcspih() and wcsbth() enforce correct FITS "keyword = value" syntax
* with regard to "= " occurring in columns 9 and 10.
*
* However, they do recognize free-format character (NOST 100-2.0,
* Sect. 5.2.1), integer (Sect. 5.2.3), and floating-point values
* (Sect. 5.2.4) for all keywords.
*
* 3: Where CROTAn, CDi_ja, and PCi_ja occur together in one header wcspih()
* and wcsbth() treat them as described in the prologue to wcs.h.
*
* 4: WCS Paper I mistakenly defined the pixel list form of WCSNAMEa as
* TWCSna instead of WCSNna; the 'T' is meant to substitute for the axis
* number in the binary table form of the keyword - note that keywords
* defined in WCS Papers II and III that are not parameterised by axis
* number have identical forms for binary tables and pixel lists.
* Consequently wcsbth() always treats WCSNna and TWCSna as equivalent.
*
* 5: wcspih() and wcsbth() interpret the "relax" argument as a vector of
* flag bits to provide fine-grained control over what non-standard WCS
* keywords to accept. The flag bits are subject to change in future and
* should be set by using the preprocessor macros (see below) for the
* purpose.
*
* - WCSHDR_none: Don't accept any extensions (not even those in the
* errata). Treat non-conformant keywords in the same way as
* non-WCS keywords in the header, i.e. simply ignore them.
*
* - WCSHDR_all: Accept all extensions recognized by the parser.
*
* - WCSHDR_reject: Reject non-standard keywords (that are not otherwise
* accepted). A message will optionally be printed on stderr by
* default, or the stream set by wcsprintf_set(), as determined by
* the ctrl argument, and nreject will be incremented.
*
* This flag may be used to signal the presence of non-standard
* keywords, otherwise they are simply passed over as though they
* did not exist in the header.
*
* Useful for testing conformance of a FITS header to the WCS
* standard.
*
* - WCSHDR_CROTAia: Accept CROTAia (wcspih()),
* iCROTna (wcsbth()),
* TCROTna (wcsbth()).
* - WCSHDR_EPOCHa: Accept EPOCHa.
* - WCSHDR_VELREFa: Accept VELREFa.
* wcspih() always recognizes the AIPS-convention keywords,
* CROTAn, EPOCH, and VELREF for the primary representation
* (a = ' ') but alternates are non-standard.
*
* wcsbth() accepts EPOCHa and VELREFa only if WCSHDR_AUXIMG is
* also enabled.
*
* - WCSHDR_CD00i00j: Accept CD00i00j (wcspih()).
* - WCSHDR_PC00i00j: Accept PC00i00j (wcspih()).
* - WCSHDR_PROJPn: Accept PROJPn (wcspih()).
* These appeared in early drafts of WCS Paper I+II (before they
* were split) and are equivalent to CDi_ja, PCi_ja, and PVi_ma
* for the primary representation (a = ' '). PROJPn is
* equivalent to PVi_ma with m = n <= 9, and is associated
* exclusively with the latitude axis.
*
* - WCSHDR_RADECSYS: Accept RADECSYS. This appeared in early drafts of
* WCS Paper I+II and was subsequently replaced by RADESYSa.
*
* wcsbth() accepts RADECSYS only if WCSHDR_AUXIMG is also
* enabled.
*
* - WCSHDR_VSOURCE: Accept VSOURCEa or VSOUna (wcsbth()). This appeared
* in early drafts of WCS Paper III and was subsequently dropped
* in favour of ZSOURCEa and ZSOUna.
*
* wcsbth() accepts VSOURCEa only if WCSHDR_AUXIMG is also
* enabled.
*
* - WCSHDR_DOBSn (wcsbth() only): Allow DOBSn, the column-specific analogue
* of DATE-OBS. By an oversight this was never formally defined
* in the standard.
*
* - WCSHDR_LONGKEY (wcsbth() only): Accept long forms of the alternate
* binary table and pixel list WCS keywords, i.e. with "a" non-
* blank. Specifically
*
# jCRPXna TCRPXna : jCRPXn jCRPna TCRPXn TCRPna CRPIXja
# - TPCn_ka : - ijPCna - TPn_ka PCi_ja
# - TCDn_ka : - ijCDna - TCn_ka CDi_ja
# iCDLTna TCDLTna : iCDLTn iCDEna TCDLTn TCDEna CDELTia
# iCUNIna TCUNIna : iCUNIn iCUNna TCUNIn TCUNna CUNITia
# iCTYPna TCTYPna : iCTYPn iCTYna TCTYPn TCTYna CTYPEia
# iCRVLna TCRVLna : iCRVLn iCRVna TCRVLn TCRVna CRVALia
# iPVn_ma TPVn_ma : - iVn_ma - TVn_ma PVi_ma
# iPSn_ma TPSn_ma : - iSn_ma - TSn_ma PSi_ma
*
* where the primary and standard alternate forms together with
* the image-header equivalent are shown rightwards of the colon.
*
* The long form of these keywords could be described as quasi-
* standard. TPCn_ka, iPVn_ma, and TPVn_ma appeared by mistake
* in the examples in WCS Paper II and subsequently these and
* also TCDn_ka, iPSn_ma and TPSn_ma were legitimized by the
* errata to the WCS papers.
*
* Strictly speaking, the other long forms are non-standard and
* in fact have never appeared in any draft of the WCS papers nor
* in the errata. However, as natural extensions of the primary
* form they are unlikely to be written with any other intention.
* Thus it should be safe to accept them provided, of course,
* that the resulting keyword does not exceed the 8-character
* limit.
*
* If WCSHDR_CNAMn is enabled then also accept
*
# iCNAMna TCNAMna : --- iCNAna --- TCNAna CNAMEia
# iCRDEna TCRDEna : --- iCRDna --- TCRDna CRDERia
# iCSYEna TCSYEna : --- iCSYna --- TCSYna CSYERia
*
* Note that CNAMEia, CRDERia, CSYERia, and their variants are
* not used by WCSLIB but are stored in the wcsprm struct as
* auxiliary information.
*
* - WCSHDR_CNAMn (wcsbth() only): Accept iCNAMn, iCRDEn, iCSYEn, TCNAMn,
* TCRDEn, and TCSYEn, i.e. with "a" blank. While non-standard,
* these are the obvious analogues of iCTYPn, TCTYPn, etc.
*
* - WCSHDR_AUXIMG (wcsbth() only): Allow the image-header form of an
* auxiliary WCS keyword with representation-wide scope to
* provide a default value for all images. This default may be
* overridden by the column-specific form of the keyword.
*
* For example, a keyword like EQUINOXa would apply to all image
* arrays in a binary table, or all pixel list columns with
* alternate representation "a" unless overridden by EQUIna.
*
* Specifically the keywords are:
*
# LATPOLEa for LATPna
# LONPOLEa for LONPna
# RESTFREQ for RFRQna
# RESTFRQa for RFRQna
# RESTWAVa for RWAVna
*
* whose keyvalues are actually used by WCSLIB, and also keywords
* that provide auxiliary information that is simply stored in
* the wcsprm struct:
*
# EPOCH - ... (No column-specific form.)
# EPOCHa - ... Only if WCSHDR_EPOCHa is set.
# EQUINOXa for EQUIna
# RADESYSa for RADEna
# RADECSYS for RADEna ... Only if WCSHDR_RADECSYS is set.
# SPECSYSa for SPECna
# SSYSOBSa for SOBSna
# SSYSSRCa for SSRCna
# VELOSYSa for VSYSna
# VELANGLa for VANGna
# VELREF - ... (No column-specific form.)
# VELREFa - ... Only if WCSHDR_VELREFa is set.
# VSOURCEa for VSOUna ... Only if WCSHDR_VSOURCE is set.
# WCSNAMEa for WCSNna ... Or TWCSna (see below).
# ZSOURCEa for ZSOUna
*
# DATE-AVG for DAVGn
# DATE-OBS for DOBSn
# MJD-AVG for MJDAn
# MJD-OBS for MJDOBn
# OBSGEO-X for OBSGXn
# OBSGEO-Y for OBSGYn
# OBSGEO-Z for OBSGZn
*
* where the image-header keywords on the left provide default
* values for the column specific keywords on the right.
*
* Keywords in the last group, such as MJD-OBS, apply to all
* alternate representations, so MJD-OBS would provide a default
* value for all images in the header.
*
* This auxiliary inheritance mechanism applies to binary table
* image arrays and pixel lists alike. Most of these keywords
* have no default value, the exceptions being LONPOLEa and
* LATPOLEa, and also RADESYSa and EQUINOXa which provide
* defaults for each other. Thus the only potential difficulty
* in using WCSHDR_AUXIMG is that of erroneously inheriting one
* of these four keywords.
*
* Unlike WCSHDR_ALLIMG, the existence of one (or all) of these
* auxiliary WCS image header keywords will not by itself cause a
* wcsprm struct to be created for alternate representation "a".
* This is because they do not provide sufficient information to
* create a non-trivial coordinate representation when used in
* conjunction with the default values of those keywords, such as
* CTYPEia, that are parameterized by axis number.
*
* - WCSHDR_ALLIMG (wcsbth() only): Allow the image-header form of *all*
* image header WCS keywords to provide a default value for all
* image arrays in a binary table (n.b. not pixel list). This
* default may be overridden by the column-specific form of the
* keyword.
*
* For example, a keyword like CRPIXja would apply to all image
* arrays in a binary table with alternate representation "a"
* unless overridden by jCRPna.
*
* Specifically the keywords are those listed above for
* WCSHDR_AUXIMG plus
*
# WCSAXESa for WCAXna
*
* which defines the coordinate dimensionality, and the following
* keywords which are parameterized by axis number:
*
# CRPIXja for jCRPna
# PCi_ja for ijPCna
# CDi_ja for ijCDna
# CDELTia for iCDEna
# CROTAi for iCROTn
# CROTAia - ... Only if WCSHDR_CROTAia is set.
# CUNITia for iCUNna
# CTYPEia for iCTYna
# CRVALia for iCRVna
# PVi_ma for iVn_ma
# PSi_ma for iSn_ma
*
# CNAMEia for iCNAna
# CRDERia for iCRDna
# CSYERia for iCSYna
*
* where the image-header keywords on the left provide default
* values for the column specific keywords on the right.
*
* This full inheritance mechanism only applies to binary table
* image arrays, not pixel lists, because in the latter case
* there is no well-defined association between coordinate axis
* number and column number.
*
* Note that CNAMEia, CRDERia, CSYERia, and their variants are
* not used by WCSLIB but are stored in the wcsprm struct as
* auxiliary information.
*
* Note especially that at least one wcsprm struct will be
* returned for each "a" found in one of the image header
* keywords listed above:
*
* - If the image header keywords for "a" ARE NOT inherited by a
* binary table, then the struct will not be associated with
* any particular table column number and it is up to the user
* to provide an association.
*
* - If the image header keywords for "a" ARE inherited by a
* binary table image array, then those keywords are considered
* to be "exhausted" and do not result in a separate wcsprm
* struct.
*
* For example, to accept CD00i00j and PC00i00j and reject all other
* extensions, use
*
= relax = WCSHDR_reject | WCSHDR_CD00i00j | WCSHDR_PC00i00j;
*
* The parser always treats EPOCH as subordinate to EQUINOXa if both are
* present, and VSOURCEa is always subordinate to ZSOURCEa.
*
* Likewise, VELREF is subordinate to the formalism of WCS Paper III, see
* spcaips().
*
* Neither wcspih() nor wcsbth() currently recognize the AIPS-convention
* keywords ALTRPIX or ALTRVAL which effectively define an alternative
* representation for a spectral axis.
*
* 6: Depending on what flags have been set in its "relax" argument,
* wcsbth() could return as many as 27027 wcsprm structs:
*
* - Up to 27 unattached representations derived from image header
* keywords.
*
* - Up to 27 structs for each of up to 999 columns containing an image
* arrays.
*
* - Up to 27 structs for a pixel list.
*
* Note that it is considered legitimate for a column to contain an image
* array and also form part of a pixel list, and in particular that
* wcsbth() does not check the TFORM keyword for a pixel list column to
* check that it is scalar.
*
* In practice, of course, a realistic binary table header is unlikely to
* contain more than a handful of images.
*
* In order for wcsbth() to create a wcsprm struct for a particular
* coordinate representation, at least one WCS keyword that defines an
* axis number must be present, either directly or by inheritance if
* WCSHDR_ALLIMG is set.
*
* When the image header keywords for an alternate representation are
* inherited by a binary table image array via WCSHDR_ALLIMG, those
* keywords are considered to be "exhausted" and do not result in a
* separate wcsprm struct. Otherwise they do.
*
* 7: Neither wcspih() nor wcsbth() check for duplicated keywords, in most
* cases they accept the last encountered.
*
* 8: wcspih() and wcsbth() use wcsnpv() and wcsnps() (refer to the prologue
* of wcs.h) to match the size of the pv[] and ps[] arrays in the wcsprm
* structs to the number in the header. Consequently there are no unused
* elements in the pv[] and ps[] arrays, indeed they will often be of
* zero length.
*
* 9: The FITS WCS standard for pixel lists assumes that a pixel list
* defines one and only one image, i.e. that each row of the binary table
* refers to just one event, e.g. the detection of a single photon or
* neutrino.
*
* In the absence of a formal mechanism for identifying the columns
* containing pixel coordinates (as opposed to pixel values or ancillary
* data recorded at the time the photon or neutrino was detected),
* Paper I discusses how the WCS keywords themselves may be used to
* identify them.
*
* In practice, however, pixel lists have been used to store multiple
* images. Besides not specifying how to identify columns, the pixel
* list convention is also silent on the method to be used to associate
* table columns with image axes.
*
* wcsbth() simply collects all WCS keywords for a particular coordinate
* representation (i.e. the "a" value in TCTYna) into one wcsprm struct.
* However, these alternates need not be associated with the same table
* columns and this allows a pixel list to contain up to 27 separate
* images. As usual, if one of these representations happened to contain
* more than two celestial axes, for example, then an error would result
* when wcsset() is invoked on it. In this case the "colsel" argument
* could be used to restrict the columns used to construct the
* representation so that it only contained one pair of celestial axes.
*
*
* wcstab() - Tabular construction routine
* ---------------------------------------
* wcstab() assists in filling in the information in the wcsprm struct relating
* to coordinate lookup tables.
*
* Tabular coordinates ('TAB') present certain difficulties in that the main
* components of the lookup table - the multidimensional coordinate array plus
* an index vector for each dimension - are stored in a FITS binary table
* extension (BINTABLE). Information required to locate these arrays is stored
* in PVi_ma and PSi_ma keywords in the image header.
*
* wcstab() parses the PVi_ma and PSi_ma keywords associated with each 'TAB'
* axis and allocates memory in the wcsprm struct for the required number of
* tabprm structs. It sets as much of the tabprm struct as can be gleaned from
* the image header, and also sets up an array of wtbarr structs (described in
* the prologue of wcs.h) to assist in extracting the required arrays from the
* BINTABLE extension(s).
*
* It is then up to the user to allocate memory for, and copy arrays from the
* BINTABLE extension(s) into the tabprm structs. A CFITSIO routine,
* fits_read_wcstab(), has been provided for this purpose, see getwcstab.h.
* wcsset() will automatically take control of this allocated memory, in
* particular causing it to be free'd by wcsfree(); the user must not attempt
* to free it after wcsset() has been called.
*
* Note that wcspih() and wcsbth() automatically invoke wcstab() on each of the
* wcsprm structs that they return.
*
* Given and returned:
* wcs struct wcsprm*
* Coordinate transformation parameters (see below).
*
* wcstab() sets ntab, tab, nwtb and wtb, allocating
* memory for the tab and wtb arrays. This allocated
* memory will be free'd automatically by wcsfree().
*
* Function return value:
* int Status return value:
* 0: Success.
* 1: Null wcsprm pointer passed.
* 2: Memory allocation failed.
* 3: Invalid tabular parameters.
*
* For returns > 1, a detailed error message is set in
* wcsprm::err if enabled, see wcserr_enable().
*
*
* wcsidx() - Index alternate coordinate representations
* -----------------------------------------------------
* wcsidx() returns an array of 27 indices for the alternate coordinate
* representations in the array of wcsprm structs returned by wcspih(). For
* the array returned by wcsbth() it returns indices for the unattached
* (colnum == 0) representations derived from image header keywords - use
* wcsbdx() for those derived from binary table image arrays or pixel lists
* keywords.
*
* Given:
* nwcs int Number of coordinate representations in the array.
*
* wcs const struct wcsprm**
* Pointer to an array of wcsprm structs returned by
* wcspih() or wcsbth().
*
* Returned:
* alts int[27] Index of each alternate coordinate representation in
* the array: alts[0] for the primary, alts[1] for 'A',
* etc., set to -1 if not present.
*
* For example, if there was no 'P' representation then
*
= alts['P'-'A'+1] == -1;
*
* Otherwise, the address of its wcsprm struct would be
*
= wcs + alts['P'-'A'+1];
*
* Function return value:
* int Status return value:
* 0: Success.
* 1: Null wcsprm pointer passed.
*
*
* wcsbdx() - Index alternate coordinate representions
* ---------------------------------------------------
* wcsbdx() returns an array of 999 x 27 indices for the alternate coordinate
* representions for binary table image arrays xor pixel lists in the array of
* wcsprm structs returned by wcsbth(). Use wcsidx() for the unattached
* representations derived from image header keywords.
*
* Given:
* nwcs int Number of coordinate representations in the array.
*
* wcs const struct wcsprm**
* Pointer to an array of wcsprm structs returned by
* wcsbth().
*
* type int Select the type of coordinate representation:
* 0: binary table image arrays,
* 1: pixel lists.
*
* Returned:
* alts short[1000][28]
* Index of each alternate coordinate represention in the
* array: alts[col][0] for the primary, alts[col][1] for
* 'A', to alts[col][26] for 'Z', where col is the
* 1-relative column number, and col == 0 is used for
* unattached image headers. Set to -1 if not present.
*
* alts[col][27] counts the number of coordinate
* representations of the chosen type for each column.
*
* For example, if there was no 'P' represention for
* column 13 then
*
= alts[13]['P'-'A'+1] == -1;
*
* Otherwise, the address of its wcsprm struct would be
*
= wcs + alts[13]['P'-'A'+1];
*
* Function return value:
* int Status return value:
* 0: Success.
* 1: Null wcsprm pointer passed.
*
*
* wcsvfree() - Free the array of wcsprm structs
* ---------------------------------------------
* wcsvfree() frees the memory allocated by wcspih() or wcsbth() for the array
* of wcsprm structs, first invoking wcsfree() on each of the array members.
*
* Given and returned:
* nwcs int* Number of coordinate representations found; set to 0
* on return.
*
* wcs struct wcsprm**
* Pointer to the array of wcsprm structs; set to 0 on
* return.
*
* Function return value:
* int Status return value:
* 0: Success.
* 1: Null wcsprm pointer passed.
*
*
* wcshdo() - Write out a wcsprm struct as a FITS header
* -----------------------------------------------------
* wcshdo() translates a wcsprm struct into a FITS header. If the colnum
* member of the struct is non-zero then a binary table image array header will
* be produced. Otherwise, if the colax[] member of the struct is set non-zero
* then a pixel list header will be produced. Otherwise, a primary image or
* image extension header will be produced.
*
* If the struct was originally constructed from a header, e.g. by wcspih(),
* the output header will almost certainly differ in a number of respects:
*
* - The output header only contains WCS-related keywords. In particular, it
* does not contain syntactically-required keywords such as SIMPLE, NAXIS,
* BITPIX, or END.
*
* - Deprecated (e.g. CROTAn) or non-standard usage will be translated to
* standard (this is partially dependent on whether wcsfix() was applied).
*
* - Quantities will be converted to the units used internally, basically SI
* with the addition of degrees.
*
* - Floating-point quantities may be given to a different decimal precision.
*
* - Elements of the PCi_ja matrix will be written if and only if they differ
* from the unit matrix. Thus, if the matrix is unity then no elements
* will be written.
*
* - Additional keywords such as WCSAXESa, CUNITia, LONPOLEa and LATPOLEa may
* appear.
*
* - The original keycomments will be lost, although wcshdo() tries hard to
* write meaningful comments.
*
* - Keyword order may be changed.
*
* Keywords can be translated between the image array, binary table, and pixel
* lists forms by manipulating the colnum or colax[] members of the wcsprm
* struct.
*
* Given:
* relax int Degree of permissiveness:
* 0: Recognize only FITS keywords defined by the
* published WCS standard.
* -1: Admit all informal extensions of the WCS
* standard.
* Fine-grained control of the degree of permissiveness
* is also possible as explained in the notes below.
*
* Given and returned:
* wcs struct wcsprm*
* Pointer to a wcsprm struct containing coordinate
* transformation parameters. Will be initialized if
* necessary.
*
* Returned:
* nkeyrec int* Number of FITS header keyrecords returned in the
* "header" array.
*
* header char** Pointer to an array of char holding the header.
* Storage for the array is allocated by wcshdo() in
* blocks of 2880 bytes (32 x 80-character keyrecords)
* and must be free'd by the user to avoid memory leaks.
*
* Each keyrecord is 80 characters long and is *NOT*
* null-terminated, so the first keyrecord starts at
* (*header)[0], the second at (*header)[80], etc.
*
* Function return value:
* int Status return value (associated with wcs_errmsg[]):
* 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().
*
* Notes:
* wcshdo() interprets the "relax" argument as a vector of flag bits to
* provide fine-grained control over what non-standard WCS keywords to write.
* The flag bits are subject to change in future and should be set by using
* the preprocessor macros (see below) for the purpose.
*
* - WCSHDO_none: Don't use any extensions.
*
* - WCSHDO_all: Write all recognized extensions, equivalent to setting each
* flag bit.
*
* - WCSHDO_safe: Write all extensions that are considered to be safe and
* recommended.
*
* - WCSHDO_DOBSn: Write DOBSn, the column-specific analogue of DATE-OBS for
* use in binary tables and pixel lists. WCS Paper III introduced
* DATE-AVG and DAVGn but by an oversight DOBSn (the obvious analogy)
* was never formally defined by the standard. The alternative to
* using DOBSn is to write DATE-OBS which applies to the whole table.
* This usage is considered to be safe and is recommended.
*
* - WCSHDO_TPCn_ka: WCS Paper I defined
*
* - TPn_ka and TCn_ka for pixel lists
*
* but WCS Paper II uses TPCn_ka in one example and subsequently the
* errata for the WCS papers legitimized the use of
*
* - TPCn_ka and TCDn_ka for pixel lists
*
* provided that the keyword does not exceed eight characters. This
* usage is considered to be safe and is recommended because of the
* non-mnemonic terseness of the shorter forms.
*
* - WCSHDO_PVn_ma: WCS Paper I defined
*
* - iVn_ma and iSn_ma for bintables and
* - TVn_ma and TSn_ma for pixel lists
*
* but WCS Paper II uses iPVn_ma and TPVn_ma in the examples and
* subsequently the errata for the WCS papers legitimized the use of
*
* - iPVn_ma and iPSn_ma for bintables and
* - TPVn_ma and TPSn_ma for pixel lists
*
* provided that the keyword does not exceed eight characters. This
* usage is considered to be safe and is recommended because of the
* non-mnemonic terseness of the shorter forms.
*
* - WCSHDO_CRPXna: For historical reasons WCS Paper I defined
*
* - jCRPXn, iCDLTn, iCUNIn, iCTYPn, and iCRVLn for bintables and
* - TCRPXn, TCDLTn, TCUNIn, TCTYPn, and TCRVLn for pixel lists
*
* for use without an alternate version specifier. However, because
* of the eight-character keyword constraint, in order to accommodate
* column numbers greater than 99 WCS Paper I also defined
*
* - jCRPna, iCDEna, iCUNna, iCTYna and iCRVna for bintables and
* - TCRPna, TCDEna, TCUNna, TCTYna and TCRVna for pixel lists
*
* for use with an alternate version specifier (the "a"). Like the
* PC, CD, PV, and PS keywords there is an obvious tendency to
* confuse these two forms for column numbers up to 99. It is very
* unlikely that any parser would reject keywords in the first set
* with a non-blank alternate version specifier so this usage is
* considered to be safe and is recommended.
*
* - WCSHDO_CNAMna: WCS Papers I and III defined
*
* - iCNAna, iCRDna, and iCSYna for bintables and
* - TCNAna, TCRDna, and TCSYna for pixel lists
*
* By analogy with the above, the long forms would be
*
* - iCNAMna, iCRDEna, and iCSYEna for bintables and
* - TCNAMna, TCRDEna, and TCSYEna for pixel lists
*
* Note that these keywords provide auxiliary information only, none
* of them are needed to compute world coordinates. This usage is
* potentially unsafe and is not recommended at this time.
*
* - WCSHDO_WCSNna: In light of wcsbth() note 4, write WCSNna instead of
* TWCSna for pixel lists. While wcsbth() treats WCSNna and TWCSna
* as equivalent, other parsers may not. Consequently, this usage
* is potentially unsafe and is not recommended at this time.
*
*
* Global variable: const char *wcshdr_errmsg[] - Status return messages
* ---------------------------------------------------------------------
* Error messages to match the status value returned from each function.
* Use wcs_errmsg[] for status returns from wcshdo().
*
*===========================================================================*/
#ifndef WCSLIB_WCSHDR
#define WCSLIB_WCSHDR
#include "wcs.h"
#ifdef __cplusplus
extern "C" {
#endif
#define WCSHDR_none 0x00000000
#define WCSHDR_all 0x000FFFFF
#define WCSHDR_reject 0x10000000
#define WCSHDR_CROTAia 0x00000001
#define WCSHDR_EPOCHa 0x00000002
#define WCSHDR_VELREFa 0x00000004
#define WCSHDR_CD00i00j 0x00000008
#define WCSHDR_PC00i00j 0x00000010
#define WCSHDR_PROJPn 0x00000020
#define WCSHDR_RADECSYS 0x00000040
#define WCSHDR_VSOURCE 0x00000080
#define WCSHDR_DOBSn 0x00000100
#define WCSHDR_LONGKEY 0x00000200
#define WCSHDR_CNAMn 0x00000400
#define WCSHDR_AUXIMG 0x00000800
#define WCSHDR_ALLIMG 0x00001000
#define WCSHDR_IMGHEAD 0x00010000
#define WCSHDR_BIMGARR 0x00020000
#define WCSHDR_PIXLIST 0x00040000
#define WCSHDO_none 0x00
#define WCSHDO_all 0xFF
#define WCSHDO_safe 0x0F
#define WCSHDO_DOBSn 0x01
#define WCSHDO_TPCn_ka 0x02
#define WCSHDO_PVn_ma 0x04
#define WCSHDO_CRPXna 0x08
#define WCSHDO_CNAMna 0x10
#define WCSHDO_WCSNna 0x20
extern const char *wcshdr_errmsg[];
enum wcshdr_errmsg_enum {
WCSHDRERR_SUCCESS = 0, /* Success. */
WCSHDRERR_NULL_POINTER = 1, /* Null wcsprm pointer passed. */
WCSHDRERR_MEMORY = 2, /* Memory allocation failed. */
WCSHDRERR_BAD_COLUMN = 3, /* Invalid column selection. */
WCSHDRERR_PARSER = 4, /* Fatal error returned by Flex
parser. */
WCSHDRERR_BAD_TABULAR_PARAMS = 5 /* Invalid tabular parameters. */
};
int wcspih(char *header, int nkeyrec, int relax, int ctrl, int *nreject,
int *nwcs, struct wcsprm **wcs);
int wcsbth(char *header, int nkeyrec, int relax, int ctrl, int keysel,
int *colsel, int *nreject, int *nwcs, struct wcsprm **wcs);
int wcstab(struct wcsprm *wcs);
int wcsidx(int nwcs, struct wcsprm **wcs, int alts[27]);
int wcsbdx(int nwcs, struct wcsprm **wcs, int type, short alts[1000][28]);
int wcsvfree(int *nwcs, struct wcsprm **wcs);
int wcshdo(int relax, struct wcsprm *wcs, int *nkeyrec, char **header);
#ifdef __cplusplus
}
#endif
#endif /* WCSLIB_WCSHDR */
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