diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/stwcs/wcsutil/altwcs.py | 94 |
1 files changed, 69 insertions, 25 deletions
diff --git a/lib/stwcs/wcsutil/altwcs.py b/lib/stwcs/wcsutil/altwcs.py index 282461a..05784a9 100644 --- a/lib/stwcs/wcsutil/altwcs.py +++ b/lib/stwcs/wcsutil/altwcs.py @@ -60,41 +60,56 @@ def archiveWCS(fname, ext=None, wcskey=" ", wcsname=" ", reusekey=False): return if not ext: - ext = range(len(f)) + simplefits = fu.isFits(f)[1] is 'simple' + if simplefits: + ext = range(len(f)) + else: + # Pywcs will create a default WCS if one is not present + # this avoids archiving a default WCS in the primary header + # if the file is in MEF format + ext = range(1, len(f)) elif isinstance(ext, int) or isinstance(ext, tuple): ext = [ext] + if not wcskey and not wcsname: + raise KeyError("Either wcskey or wcsname should be specified") + wcsext = ext[0] - if wcskey == " ": - # try getting the key from WCSNAME - if not wcsname.strip(): - wkey = next_wcskey(f[wcsext].header) - else: - wkey = getKeyFromName(f[wcsext].header, wcsname) - else: - if wcskey not in available_wcskeys(f[wcsext].header): - # reuse wcsname - if not wcsname.strip(): - wcsname = f[wcsext].header["WCSNAME"+wcskey] + if wcskey in wcskeys(f[wcsext].header) and not reusekey: + raise KeyError("Wcskey %s is aready used. \ + Run archiveWCS() with reusekey=True to overwrite this alternate WCS. \ + Alternatively choose another wcskey with altwcs.available_wcskeys()." %wcskey) + elif wcskey == " ": + # wcsname exists, overwrite it if reuse is True or get the next key + if wcsname.strip() in wcsnames(f[wcsext].header).values(): + if reusekey: + # try getting the key from an existing WCS with WCSNAME + wkey = getKeyFromName(f[wcsext].header, wcsname) wname = wcsname - wkey = wcskey + if not wkey: + raise KeyError("Could not get a valid wcskey from wcsname %s" %wcsname) else: - wkey = wcskey - wname = wcsname + raise KeyError("Wcsname %s is aready used. \ + Run archiveWCS() with reusekey=True to overwrite this alternate WCS. \ + Alternatively choose another wcskey with altwcs.available_wcskeys() or\ + choose another wcsname." %wcsname) else: - wkey = wcskey + wkey = next_wcskey(f[wcsext].header) wname = wcsname - + else: + wkey = wcskey + wname = wcsname + for e in ext: try: w = pywcs.WCS(f[e].header, fobj=f) except: - # this should be revisited, should catchspecific errors + # this should be revisited, should catch specific errors # KeyError - not a valid key, ValueError - not a valid extension, etc continue hwcs = w.to_header() wcsnamekey = 'WCSNAME' + wkey - f[e].header.update(key=wcsnamekey, value=wcsname) + f[e].header.update(key=wcsnamekey, value=wname) if w.wcs.has_cd(): pc2cd(hwcs) for k in hwcs.keys(): @@ -158,8 +173,6 @@ def restoreWCS(f, ext=None, fromext=None, toext=None, wcskey=" ", wcsname=" ", if isinstance(ext, int) or isinstance(ext, tuple): ext = [ext] - #if isinstance(fromext, str): - # fromext = [fromext] if isinstance(toext, str): toext = [toext] @@ -296,6 +309,20 @@ def deleteWCS(fname, ext=None, wcskey=" ", wcsname=" "): closefobj(fname, fobj) def _restore(fobj, ukey, fromextnum, toextnum=None, fromextnam=None, toextnam=None): + """ + fobj: string of HDUList + ukey: string 'A'-'Z' + wcs key + fromextnum: int + extver of extension from which to copy WCS + fromextnam: string + extname of extension from which to copy WCS + toextnum: int + extver of extension to which to copy WCS + toextnam: string + extname of extension to which to copy WCS + """ + # create an extension tuple, e.g. ('SCI', 2) if fromextnam: fromextension = (fromextnam, fromextnum) else: @@ -358,7 +385,11 @@ def wcskeys(fobj, ext=None): Parameters ---------- - hdr: pyfits.Header + fobj: string, pyfits.HDUList or pyfits.Header + fits file name, pyfits file object or pyfits header + ext: int or None + extension number + if None, fobj must be a header """ _check_headerpars(fobj, ext) hdr = _getheader(fobj, ext) @@ -371,7 +402,12 @@ def wcsnames(fobj, ext=None): Parameters ---------- - header: pyfits.Header + fobj: string, pyfits.HDUList or pyfits.Header + fits file name, pyfits file object or pyfits header + ext: int or None + extension number + if None, fobj must be a header + """ _check_headerpars(fobj, ext) hdr = _getheader(fobj, ext) @@ -389,7 +425,11 @@ def available_wcskeys(fobj, ext=None): Parameters ---------- - header: pyfits.Header + fobj: string, pyfits.HDUList or pyfits.Header + fits file name, pyfits file object or pyfits header + ext: int or None + extension number + if None, fobj must be a header """ _check_headerpars(fobj, ext) hdr = _getheader(fobj, ext) @@ -408,7 +448,11 @@ def next_wcskey(fobj, ext=None): Parameters ---------- - header: pyfits.Header + fobj: string, pyfits.HDUList or pyfits.Header + fits file name, pyfits file object or pyfits header + ext: int or None + extension number + if None, fobj must be a header """ _check_headerpars(fobj, ext) hdr = _getheader(fobj, ext) |