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-rw-r--r--stwcs/updatewcs/npol.py117
1 files changed, 60 insertions, 57 deletions
diff --git a/stwcs/updatewcs/npol.py b/stwcs/updatewcs/npol.py
index 33579f0..9c88150 100644
--- a/stwcs/updatewcs/npol.py
+++ b/stwcs/updatewcs/npol.py
@@ -1,15 +1,16 @@
-from __future__ import absolute_import, division # confidence high
+from __future__ import absolute_import, division, print_function
-import logging, time
+import logging
+import time
import numpy as np
from astropy.io import fits
from stsci.tools import fileutil
-from . import utils
logger = logging.getLogger('stwcs.updatewcs.npol')
+
class NPOLCorr(object):
"""
Defines a Lookup table prior distortion correction as per WCS paper IV.
@@ -43,7 +44,7 @@ class NPOLCorr(object):
Science file, for which a distortion correction in a NPOLFILE is available
"""
- logger.info("\n\tStarting NPOL: %s" %time.asctime())
+ logger.info("\n\tStarting NPOL: %s" % time.asctime())
try:
assert isinstance(fobj, fits.HDUList)
except AssertionError:
@@ -79,28 +80,28 @@ class NPOLCorr(object):
header = ext.header
# get the data arrays from the reference file and transform
# them for use with SIP
- dx,dy = cls.getData(nplfile, ccdchip)
+ dx, dy = cls.getData(nplfile, ccdchip)
idccoeffs = cls.getIDCCoeffs(header)
if idccoeffs is not None:
- dx, dy = cls.transformData(dx,dy, idccoeffs)
+ dx, dy = cls.transformData(dx, dy, idccoeffs)
# Determine EXTVER for the WCSDVARR extension from the
# NPL file (EXTNAME, EXTVER) kw.
# This is used to populate DPj.EXTVER kw
- wcsdvarr_x_version = 2 * extversion -1
+ wcsdvarr_x_version = 2 * extversion - 1
wcsdvarr_y_version = 2 * extversion
- for ename in zip(['DX', 'DY'], [wcsdvarr_x_version,wcsdvarr_y_version],[dx, dy]):
+ for ename in zip(['DX', 'DY'], [wcsdvarr_x_version, wcsdvarr_y_version], [dx, dy]):
error_val = ename[2].max()
cls.addSciExtKw(header, wdvarr_ver=ename[1], npol_extname=ename[0], error_val=error_val)
- hdu = cls.createNpolHDU(header, npolfile=nplfile, \
- wdvarr_ver=ename[1], npl_extname=ename[0], data=ename[2],ccdchip=ccdchip)
+ hdu = cls.createNpolHDU(header, npolfile=nplfile,
+ wdvarr_ver=ename[1], npl_extname=ename[0],
+ data=ename[2], ccdchip=ccdchip)
if wcsdvarr_ind:
fobj[wcsdvarr_ind[ename[1]]] = hdu
else:
fobj.append(hdu)
-
applyNPOLCorr = classmethod(applyNPOLCorr)
def getWCSIndex(cls, fobj):
@@ -129,17 +130,17 @@ class NPOLCorr(object):
Adds kw to sci extension to define WCSDVARR lookup table extensions
"""
- if npol_extname =='DX':
- j=1
+ if npol_extname == 'DX':
+ j = 1
else:
- j=2
-
- cperror = 'CPERR%s' %j
- cpdis = 'CPDIS%s' %j
- dpext = 'DP%s.' %j + 'EXTVER'
- dpnaxes = 'DP%s.' %j +'NAXES'
- dpaxis1 = 'DP%s.' %j+'AXIS.1'
- dpaxis2 = 'DP%s.' %j+'AXIS.2'
+ j = 2
+
+ cperror = 'CPERR%s' % j
+ cpdis = 'CPDIS%s' % j
+ dpext = 'DP%s.' % j + 'EXTVER'
+ dpnaxes = 'DP%s.' % j + 'NAXES'
+ dpaxis1 = 'DP%s.' % j + 'AXIS.1'
+ dpaxis2 = 'DP%s.' % j + 'AXIS.2'
keys = [cperror, cpdis, dpext, dpnaxes, dpaxis1, dpaxis2]
values = {cperror: error_val,
cpdis: 'Lookup',
@@ -165,15 +166,15 @@ class NPOLCorr(object):
addSciExtKw = classmethod(addSciExtKw)
- def getData(cls,nplfile, ccdchip):
+ def getData(cls, nplfile, ccdchip):
"""
Get the data arrays from the reference NPOL files
Make sure 'CCDCHIP' in the npolfile matches "CCDCHIP' in the science file.
"""
npl = fits.open(nplfile)
for ext in npl:
- nplextname = ext.header.get('EXTNAME',"")
- nplccdchip = ext.header.get('CCDCHIP',1)
+ nplextname = ext.header.get('EXTNAME', "")
+ nplccdchip = ext.header.get('CCDCHIP', 1)
if nplextname == 'DX' and nplccdchip == ccdchip:
xdata = ext.data.copy()
continue
@@ -192,7 +193,7 @@ class NPOLCorr(object):
"""
ndx, ndy = np.dot(coeffs, [dx.ravel(), dy.ravel()]).astype(np.float32)
ndx.shape = dx.shape
- ndy.shape=dy.shape
+ ndy.shape = dy.shape
return ndx, ndy
transformData = classmethod(transformData)
@@ -206,7 +207,7 @@ class NPOLCorr(object):
ocx11 = header['OCX11']
ocy10 = header['OCY10']
ocy11 = header['OCY11']
- coeffs = np.array([[ocx11, ocx10], [ocy11,ocy10]], dtype=np.float32)
+ coeffs = np.array([[ocx11, ocx10], [ocy11, ocy10]], dtype=np.float32)
except KeyError:
logger.exception('\n\tFirst order IDCTAB coefficients are not available. \n\
Cannot convert SIP to IDC coefficients.')
@@ -217,15 +218,17 @@ class NPOLCorr(object):
logger.exception("IDCSCALE not found in header - setting it to 1.")
idcscale = 1
- return np.linalg.inv(coeffs/idcscale)
+ return np.linalg.inv(coeffs / idcscale)
getIDCCoeffs = classmethod(getIDCCoeffs)
- def createNpolHDU(cls, sciheader, npolfile=None, wdvarr_ver=1, npl_extname=None,data = None, ccdchip=1):
+ def createNpolHDU(cls, sciheader, npolfile=None, wdvarr_ver=1, npl_extname=None,
+ data=None, ccdchip=1):
"""
Creates an HDU to be added to the file object.
"""
- hdr = cls.createNpolHdr(sciheader, npolfile=npolfile, wdvarr_ver=wdvarr_ver, npl_extname=npl_extname, ccdchip=ccdchip)
+ hdr = cls.createNpolHdr(sciheader, npolfile=npolfile, wdvarr_ver=wdvarr_ver,
+ npl_extname=npl_extname, ccdchip=ccdchip)
hdu = fits.ImageHDU(header=hdr, data=data)
return hdu
@@ -256,29 +259,29 @@ class NPOLCorr(object):
npl.close()
naxis = npl[1].header['NAXIS']
- ccdchip = nplextname #npol_header['CCDCHIP']
+ ccdchip = nplextname # npol_header['CCDCHIP']
- kw = { 'NAXIS': 'Size of the axis',
- 'CDELT': 'Coordinate increment along axis',
- 'CRPIX': 'Coordinate system reference pixel',
- 'CRVAL': 'Coordinate system value at reference pixel',
- }
+ kw = {'NAXIS': 'Size of the axis',
+ 'CDELT': 'Coordinate increment along axis',
+ 'CRPIX': 'Coordinate system reference pixel',
+ 'CRVAL': 'Coordinate system value at reference pixel',
+ }
kw_comm1 = {}
kw_val1 = {}
for key in kw.keys():
- for i in range(1, naxis+1):
+ for i in range(1, naxis + 1):
si = str(i)
- kw_comm1[key+si] = kw[key]
+ kw_comm1[key + si] = kw[key]
- for i in range(1, naxis+1):
+ for i in range(1, naxis + 1):
si = str(i)
- kw_val1['NAXIS'+si] = npol_header.get('NAXIS'+si)
- kw_val1['CDELT'+si] = npol_header.get('CDELT'+si, 1.0) * \
- sciheader.get('LTM'+si+'_'+si, 1)
- kw_val1['CRPIX'+si] = npol_header.get('CRPIX'+si, 0.0)
- kw_val1['CRVAL'+si] = (npol_header.get('CRVAL'+si, 0.0) - \
- sciheader.get('LTV'+str(i), 0))
+ kw_val1['NAXIS' + si] = npol_header.get('NAXIS' + si)
+ kw_val1['CDELT' + si] = npol_header.get('CDELT' + si, 1.0) * \
+ sciheader.get('LTM' + si + '_' + si, 1)
+ kw_val1['CRPIX' + si] = npol_header.get('CRPIX' + si, 0.0)
+ kw_val1['CRVAL' + si] = (npol_header.get('CRVAL' + si, 0.0) -
+ sciheader.get('LTV' + str(i), 0))
kw_comm0 = {'XTENSION': 'Image extension',
'BITPIX': 'IEEE floating point',
@@ -289,15 +292,15 @@ class NPOLCorr(object):
'GCOUNT': 'One data group',
}
- kw_val0 = { 'XTENSION': 'IMAGE',
- 'BITPIX': -32,
- 'NAXIS': naxis,
- 'EXTNAME': 'WCSDVARR',
- 'EXTVER': wdvarr_ver,
- 'PCOUNT': 0,
- 'GCOUNT': 1,
- 'CCDCHIP': ccdchip,
- }
+ kw_val0 = {'XTENSION': 'IMAGE',
+ 'BITPIX': -32,
+ 'NAXIS': naxis,
+ 'EXTNAME': 'WCSDVARR',
+ 'EXTVER': wdvarr_ver,
+ 'PCOUNT': 0,
+ 'GCOUNT': 1,
+ 'CCDCHIP': ccdchip,
+ }
cdl = []
for key in kw_comm0.keys():
cdl.append((key, kw_val0[key], kw_comm0[key]))
@@ -310,11 +313,11 @@ class NPOLCorr(object):
for i, c in enumerate(npol_phdr):
if c == 'FILENAME':
start_indx = i
- if c == '': # remove blanks from end of header
- end_indx = i+1
+ if c == '': # remove blanks from end of header
+ end_indx = i + 1
break
if start_indx >= 0:
- for card in npol_phdr.cards[start_indx:end_indx]:
+ for card in npol_phdr.cards[start_indx: end_indx]:
cdl.append(card)
hdr = fits.Header(cards=cdl)
@@ -331,7 +334,7 @@ class NPOLCorr(object):
if fobj[0].header['INSTRUME'] == 'ACS' and fobj[0].header['DETECTOR'] == 'WFC':
ccdchip = fobj[extname, extver].header['CCDCHIP']
elif fobj[0].header['INSTRUME'] == 'WFC3' and fobj[0].header['DETECTOR'] == 'UVIS':
- ccdchip = fobj[extname, extver].header['CCDCHIP']
+ ccdchip = fobj[extname, extver].header['CCDCHIP']
elif fobj[0].header['INSTRUME'] == 'WFPC2':
ccdchip = fobj[extname, extver].header['DETECTOR']
elif fobj[0].header['INSTRUME'] == 'STIS':
generated by cgit (git 2.34.1) at 2025-04-28 23:01:47 -0400