diff options
Diffstat (limited to 'lib/stwcs/wcsutil/altwcs.py')
| -rw-r--r-- | lib/stwcs/wcsutil/altwcs.py | 115 |
1 files changed, 86 insertions, 29 deletions
diff --git a/lib/stwcs/wcsutil/altwcs.py b/lib/stwcs/wcsutil/altwcs.py index cde176c..d54bde9 100644 --- a/lib/stwcs/wcsutil/altwcs.py +++ b/lib/stwcs/wcsutil/altwcs.py @@ -118,9 +118,9 @@ def archiveWCS(fname, ext, wcskey=" ", wcsname=" ", reusekey=False): f[e].header.update(key=key, value=hwcs[k]) closefobj(fname, f) -def restoreWCS(f, ext, fromext=None, toext=None, wcskey=" ", wcsname=" "): +def restore_from_to(f, fromext=None, toext=None, wcskey=" ", wcsname=" "): """ - Copy a WCS with key "WCSKEY" to the primary WCS + Copy an alternate WCS from one extension as a primary WCS of another extension Reads in a WCS defined with wcskey and saves it as the primary WCS. Goes sequentially through the list of extensions in ext. @@ -136,6 +136,82 @@ def restoreWCS(f, ext, fromext=None, toext=None, wcskey=" ", wcsname=" "): toext: string or python list extname or a list of extnames to which the WCS will be copied as primary, for example ['SCI', 'ERR', 'DQ'] + wcskey: a charater + "A"-"Z" - Used for one of 26 alternate WCS definitions. + or " " - find a key from WCSNAMe value + wcsname: string (optional) + if given and wcskey is " ", will try to restore by WCSNAME value + + See Also + -------- + archiveWCS - copy the primary WCS as an alternate WCS + restoreWCS - Copy a WCS with key "WCSKEY" to the primary WCS + + """ + if isinstance(f, str): + fobj = pyfits.open(f, mode='update') + else: + fobj = f + + if not _parpasscheck(fobj, ext=None, wcskey=wcskey, fromext=fromext, toext=toext): + closefobj(f, fobj) + raise ValueError("Input parameters problem") + + # Interpret input 'ext' value to get list of extensions to process + #ext = _buildExtlist(fobj, ext) + + if isinstance(toext, str): + toext = [toext] + + # the case of an HDUList object in memory without an associated file + + #if fobj.filename() is not None: + # name = fobj.filename() + + simplefits = fu.isFits(fobj)[1] is 'simple' + if simplefits: + wcskeyext = 0 + else: + wcskeyext = 1 + + if wcskey == " ": + if wcsname.strip(): + wkey = getKeyFromName(fobj[wcskeyext].header, wcsname) + if not wkey: + closefobj(f, fobj) + raise KeyError("Could not get a key from wcsname %s ." % wcsname) + else: + if wcskey not in wcskeys(fobj, ext=wcskeyext): + print "Could not find alternate WCS with key %s in this file" % wcskey + closefobj(f, fobj) + return + wkey = wcskey + + countext = fu.countExtn(fobj, fromext) + if not countext: + raise KeyError("File does not have extension with extname %s", fromext) + else: + for i in range(1, countext+1): + for toe in toext: + _restore(fobj, fromextnum=i, fromextnam=fromext, toextnum=i, toextnam=toe, ukey=wkey) + + if fobj.filename() is not None: + #fobj.writeto(name) + closefobj(f, fobj) + +def restoreWCS(f, ext, wcskey=" ", wcsname=" "): + """ + Copy a WCS with key "WCSKEY" to the primary WCS + + Reads in a WCS defined with wcskey and saves it as the primary WCS. + Goes sequentially through the list of extensions in ext. + Alternatively uses 'fromext' and 'toext'. + + + Parameters + ---------- + f: string or pyfits.HDUList object + a file name or a file object ext: an int, a tuple, string, or list of integers or tuples (e.g.('sci',1)) fits extensions to work with If a string is provided, it should specify the EXTNAME of extensions @@ -148,7 +224,8 @@ def restoreWCS(f, ext, fromext=None, toext=None, wcskey=" ", wcsname=" "): See Also -------- - wcsutil.archiveWCS - copy the primary WCS as an alternate WCS + archiveWCS - copy the primary WCS as an alternate WCS + restore_from_to """ if isinstance(f, str): @@ -156,15 +233,13 @@ def restoreWCS(f, ext, fromext=None, toext=None, wcskey=" ", wcsname=" "): else: fobj = f - if not _parpasscheck(fobj, ext=ext, wcskey=wcskey, fromext=fromext, toext=toext): + if not _parpasscheck(fobj, ext=ext, wcskey=wcskey): closefobj(f, fobj) raise ValueError("Input parameters problem") # Interpret input 'ext' value to get list of extensions to process ext = _buildExtlist(fobj, ext) - if isinstance(toext, str): - toext = [toext] # the case of an HDUList object in memory without an associated file @@ -190,28 +265,10 @@ def restoreWCS(f, ext, fromext=None, toext=None, wcskey=" ", wcsname=" "): return wkey = wcskey - if ext: - # if ext is given ignore fromext and toext. - for e in ext: - _restore(fobj, wkey, fromextnum=e) - else: - # the case when ext is None but fromext and toext are given - # This only works with MEF files. It uses extname, extver. - # For each extname in fromext find the corresponding extver for each - # extname in toext and update the primary WCS. - if fromext and toext: - countext = fu.countExtn(fobj, fromext) - if not countext: - raise KeyError("File does not have extension with extname %s", fromext) - else: - for i in range(1, countext+1): - for toe in toext: - _restore(fobj, fromextnum=i, fromextnam=fromext, toextnum=i, toextnam=toe, ukey=wkey) - else: - ext = range(len(fobj)) - for e in ext: - _restore(fobj, wkey, fromextnum=e) - + + for e in ext: + _restore(fobj, wkey, fromextnum=e) + if fobj.filename() is not None: #fobj.writeto(name) closefobj(f, fobj) @@ -274,7 +331,7 @@ def deleteWCS(fname, ext, wcskey=" ", wcsname=" "): prexts = [] for i in ext: hdr = fobj[i].header - hwcs = readAltWCs(fobj,i,wcskey=wkey) + hwcs = readAltWCS(fobj,i,wcskey=wkey) if hwcs is None: continue for k in hwcs.keys(): |