def reduceToFits(obj):
"""Pickle to FITS
Intended to be used by the ``__reduce__`` method of a class.
Parameters
----------
obj
any object with a ``writeFits`` method taking a
`~lsst.afw.fits.MemFileManager` and possibly an
`~lsst.afw.fits.ImageWriteOptions`.
Returns
-------
reduced : `tuple` [callable, `tuple`]
a tuple in the format returned by `~object.__reduce__`
"""
manager = MemFileManager()
options = ImageWriteOptions(ImageCompressionOptions(ImageCompressionOptions.NONE))
table = getattr(obj, 'table', None)
if isinstance(table, lsst.afw.table.BaseTable):
# table objects don't take `options`
obj.writeFits(manager)
else:
# MaskedImage and Exposure both require options for each plane (image, mask, variance)
if isinstance(obj, (lsst.afw.image.MaskedImage, lsst.afw.image.Exposure)):
obj.writeFits(manager, options, options, options)
else:
obj.writeFits(manager, options)
size = manager.getLength()
data = manager.getData()
return (unreduceFromFits, (obj.__class__, data, size))
def unreduceFromFits(cls, data, size):
"""Unpickle from FITS
Unpack data produced by `reduceToFits`. This method is used by the
pickling framework and should not need to be called from user code.
Parameters
----------
cls : `type`
the class of object to unpickle. Must have a class-level ``readFits``
method taking a `~lsst.afw.fits.MemFileManager`.
data : `bytes`
an in-memory representation of the object, compatible with
`~lsst.afw.fits.MemFileManager`
size : `int`
the length of `data`
Returns
-------
unpickled : ``cls``
the object represented by ``data``
"""
manager = MemFileManager(size)
manager.setData(data, size)
return cls.readFits(manager)
def reduceToFits(obj):
"""Pickle to FITS
Intended to be used by the ``__reduce__`` method of a class.
Parameters
----------
obj
any object with a ``writeFits`` method taking a
`~lsst.afw.fits.MemFileManager` and possibly an
`~lsst.afw.fits.ImageWriteOptions`.
Returns
-------
reduced : `tuple` [callable, `tuple`]
a tuple in the format returned by `~object.__reduce__`
"""
manager = MemFileManager()
options = ImageWriteOptions(
ImageCompressionOptions(ImageCompressionOptions.NONE))
table = getattr(obj, 'table', None)
if isinstance(table, lsst.afw.table.BaseTable):
# table objects don't take `options`
obj.writeFits(manager)
else:
# MaskedImage and Exposure both require options for each plane (image, mask, variance)
if isinstance(obj,
(lsst.afw.image.MaskedImage, lsst.afw.image.Exposure)):
obj.writeFits(manager, options, options, options)
else:
obj.writeFits(manager, options)
size = manager.getLength()
data = manager.getData()
return (unreduceFromFits, (obj.__class__, data, size))
def unreduceFromFits(cls, data, size):
"""Unpickle from FITS
Unpack data produced by `reduceToFits`. This method is used by the
pickling framework and should not need to be called from user code.
Parameters
----------
cls : `type`
the class of object to unpickle. Must have a class-level ``readFits``
method taking a `~lsst.afw.fits.MemFileManager`.
data : `bytes`
an in-memory representation of the object, compatible with
`~lsst.afw.fits.MemFileManager`
size : `int`
the length of `data`
Returns
-------
unpickled : ``cls``
the object represented by ``data``
"""
manager = MemFileManager(size)
manager.setData(data, size)
return cls.readFits(manager)
def getCosmosCutout(ra=150.23983, dec=+2.56283, sizeX=3):
"""Return an ACS COSMOS cutout from IRSA
\param ra Right ascension in decimal degrees (J2000)
\param dec Declination in decimal degrees (J2000)
\param size Size of cutout (arcsec)
See http://irsa.ipac.caltech.edu/applications/Cutouts/docs/CutoutsProgramInterface.html
but beware that (as of 2014-03-31) the locstr in the example isn't quite right (needs
a %20 between the ra and dec)
"""
url = "http://irsa.ipac.caltech.edu/cgi-bin/Cutouts/nph-cutouts?" + \
"mission=COSMOS&max_size=180&locstr=%(ra).5f%%20%(dec).5f&sizeX=%(sizeX)d&ntable_cutouts=1&cutouttbl1=acs_mosaic_2.0&mode=PI" % \
dict(ra=ra, dec=dec, sizeX=sizeX)
response = urllib2.urlopen(url)
html = response.read()
root = ET.fromstring(html)
status = root.get("status")
if status != "ok":
raise RuntimeError("Failed to open cutout URL: %s %s" % (status, root.get("message")))
#
# Find the cutouts
#
cutouts = root.find("images").find("cutouts")
if not len(cutouts):
html2 = urllib2.urlopen(root.find("summary").find("resultHtml").text.strip()).read()
# fix things for ET
html2 = re.sub(r"&(nbsp;|micro)", "", html2)
root2 = ET.fromstring(html2)
body = root2[1]
try:
msg = body[-1][0][3][0][0][-1][0][0].text # aaarghhhh
msg = re.sub(r":\s*$", "", msg)
except:
msg = "Unable to retrieve cutout" + ":"
print >> sys.stderr, "Failed to retrieve cutout %s" % re.sub(r"\s+", " ", msg)
return afwImage.ExposureF(30,30)
#
# Read the fits data
#
try:
fitsFD = urllib2.urlopen(cutouts[0].text.strip()) # 0: fits, 1: jpg
fitsData = fitsFD.read()
except Exception as e:
fitsFD = None
finally:
del fitsFD
#
# and create an afwExposure
#
manager = MemFileManager(len(fitsData))
memmove(manager.getData(), fitsData)
return afwImage.ExposureF(manager)
def getCosmosCutout(ra=150.23983, dec=+2.56283, sizeX=3):
"""Return an ACS COSMOS cutout from IRSA
\param ra Right ascension in decimal degrees (J2000)
\param dec Declination in decimal degrees (J2000)
\param size Size of cutout (arcsec)
See http://irsa.ipac.caltech.edu/applications/Cutouts/docs/CutoutsProgramInterface.html but beware that (as of
2014-03-31) the locstr in the example isn't quite right (needs a %20 between the ra and dec)
"""
url = "http://irsa.ipac.caltech.edu/cgi-bin/Cutouts/nph-cutouts?" + \
"mission=COSMOS&max_size=180&locstr=%(ra).5f%%20%(dec).5f&sizeX=%(sizeX)d&ntable_cutouts=1&cutouttbl1=acs_mosaic_2.0&mode=PI" % \
dict(ra=ra, dec=dec, sizeX=sizeX)
response = urllib2.urlopen(url)
html = response.read()
root = ET.fromstring(html)
status = root.get("status")
if status != "ok":
raise RuntimeError("Failed to open cutout URL: %s %s" % (status, root.get("message")))
#
# Find the cutouts
#
cutouts = root.find("images").find("cutouts")
if not len(cutouts):
html2 = urllib2.urlopen(root.find("summary").find("resultHtml").text.strip()).read()
# fix things for ET
html2 = re.sub(r"&(nbsp;|micro)", "", html2)
root2 = ET.fromstring(html2)
body = root2[1]
try:
msg = body[-1][0][3][0][0][-1][0][0].text # aaarghhhh
msg = re.sub(r":\s*$", "", msg)
except:
msg = "Unable to retrieve cutout" + ":"
print >> sys.stderr, "Failed to retrieve cutout %s" % re.sub(r"\s+", " ", msg)
return afwImage.ExposureF(30,30)
#
# Read the fits data
#
try:
fitsFD = urllib2.urlopen(cutouts[0].text.strip()) # 0: fits, 1: jpg
fitsData = fitsFD.read()
except Exception as e:
fitsFD = None
finally:
del fitsFD
#
# and create an afwExposure
#
manager = MemFileManager(len(fitsData))
memmove(manager.getData(), fitsData)
return afwImage.ExposureF(manager)
def unreduceFromFits(cls, data, size):
"""Unpickle from FITS
Unpacks data produced by reduceToFits.
Assumes the existence of a "readFits" method on the object.
"""
manager = MemFileManager(size + 1) # Allow an extra char for nul
memmove(manager.getData(), data)
return cls.readFits(manager)
def unreduceFromFits(cls, data, size):
"""Unpickle from FITS
Unpacks data produced by reduceToFits.
Assumes the existence of a "readFits" method on the object.
"""
manager = MemFileManager(size)
manager.setData(data, size)
return cls.readFits(manager)
def reduceToFits(obj):
"""Pickle to FITS
Intended to be used by the __reduce__ method of a class.
Assumes the existence of a "writeFits" method on the object.
"""
manager = MemFileManager()
obj.writeFits(manager)
size = manager.getLength()
data = cdata(manager.getData(), size);
return (unreduceFromFits, (obj.__class__, data, size))
def reduceToFits(obj):
"""Pickle to FITS
Intended to be used by the __reduce__ method of a class.
Assumes the existence of a "writeFits" method on the object.
"""
manager = MemFileManager()
options = ImageWriteOptions(
ImageCompressionOptions(ImageCompressionOptions.NONE))
try:
obj.writeFits(manager, options)
except Exception:
obj.writeFits(manager)
size = manager.getLength()
data = manager.getData()
return (unreduceFromFits, (obj.__class__, data, size))
