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| author | dencheva <dencheva@stsci.edu> | 2010-09-22 15:30:12 -0400 |
|---|---|---|
| committer | dencheva <dencheva@stsci.edu> | 2010-09-22 15:30:12 -0400 |
| commit | 57e00fc8ac9b9143dd47acf97346db16ae53c26f (patch) | |
| tree | 99694d0608bb0a2dc27273c33d5edfe70fea7fc7 /updatewcs/utils.py | |
| parent | 30d6c3d87b33940c8319fa53dd7cf2838706fb87 (diff) | |
| download | stwcs_hcf-57e00fc8ac9b9143dd47acf97346db16ae53c26f.tar.gz | |
Moved utils from stwcs to updatewcs
git-svn-id: http://svn.stsci.edu/svn/ssb/stsci_python/stsci_python/trunk/stwcs@10375 fe389314-cf27-0410-b35b-8c050e845b92
Diffstat (limited to 'updatewcs/utils.py')
| -rw-r--r-- | updatewcs/utils.py | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/updatewcs/utils.py b/updatewcs/utils.py new file mode 100644 index 0000000..29ba5f3 --- /dev/null +++ b/updatewcs/utils.py @@ -0,0 +1,28 @@ +from __future__ import division # confidence high + +def diff_angles(a,b): + """ + Perform angle subtraction a-b taking into account + small-angle differences across 360degree line. + """ + + diff = a - b + + if diff > 180.0: + diff -= 360.0 + + if diff < -180.0: + diff += 360.0 + + return diff + +def getBinning(fobj, extver=1): + # Return the binning factor + binned = 1 + if fobj[0].header['INSTRUME'] == 'WFPC2': + mode = fobj[0].header.get('MODE', "") + if mode == 'AREA': binned = 2 + else: + binned = fobj['SCI', extver].header.get('BINAXIS',1) + return binned + |