def pointVerify(self):
"""
Checks telescope pointing.
If abs ( telescope coordinates - image coordinates ) > tolerance
move the scope
take a new image
test again
do this while ntrials < max_tries
Returns True if centering was succesful
False if not
"""
# take an image and read its coordinates off the header
try:
image_path, image = self._takeImage()
self.log.debug("Taking image: image name %s" % image_path)
except:
self.log.error("Can't take image")
raise
tel = self.getTel()
# analyze the previous image using
# AstrometryNet defined in util
try:
wcs_name = AstrometryNet.solveField(image_path, findstarmethod="sex")
except NoSolutionAstrometryNetException, e:
raise e
def pointVerify (self):
""" Checks telescope pointing
Checks the pointing.
If abs ( telescope coordinates - image coordinates ) > tolerance
move the scope
take a new image
test again
do this while ntrials < max_trials
Returns True if centering was succesful
False if not
"""
# take an image and read its coordinates off the header
image = None
try:
image = self._takeImage()
print "image name %s", image.filename()
except:
self.log.error( "Can't take image" )
raise
ra_img_center = image["CRVAL1"] # expects to see this in image
dec_img_center= image["CRVAL2"]
currentImageCenter = Position.fromRaDec(Coord.fromD(ra_img_center),
Coord.fromD(dec_img_center))
tel = self.getTel()
# analyze the previous image using
# AstrometryNet defined in util
try:
wcs_name = AstrometryNet.solveField(image.filename(),findstarmethod="sex")
except NoSolutionAstrometryNetException, e:
raise e
def pointVerify(self):
""" Checks telescope pointing
Checks the pointing.
If abs ( telescope coordinates - image coordinates ) > tolerance
move the scope
take a new image
test again
do this while ntrials < max_trials
Returns True if centering was succesful
False if not
"""
# take an image and read its coordinates off the header
image = None
try:
image = self._takeImage()
print "image name %s", image.filename()
except:
self.log.error("Can't take image")
raise
ra_img_center = image["CRVAL1"] # expects to see this in image
dec_img_center = image["CRVAL2"]
currentImageCenter = Position.fromRaDec(Coord.fromD(ra_img_center),
Coord.fromD(dec_img_center))
tel = self.getTel()
# analyze the previous image using
# AstrometryNet defined in util
try:
wcs_name = AstrometryNet.solveField(image.filename(),
findstarmethod="sex")
except NoSolutionAstrometryNetException, e:
raise e
def pointVerify(self):
""" Checks telescope pointing
Checks the pointing.
If telescope coordinates - image coordinates > tolerance
move the scope
take a new image
test again
do this while ntrials < max_trials
Returns True if centering was succesful
False if not
"""
# take an image and read its coordinates off the header
try:
image_name = self._takeImage()
# for testing purposes uncomment line below and specify some image
except:
self.log.error("Can't take image")
raise
image = Image.fromFile(image_name) # Image defined in util
ra_img_center = image["CRVAL1"] # expects to see this in image
dec_img_center = image["CRVAL2"]
currentImageCenter = Position.fromRaDec(Coord.fromD(ra_img_center),
Coord.fromD(dec_img_center))
tel = self.getTel()
# analyze the previous image using
# AstrometryNet defined in util
try:
wcs_name = AstrometryNet.solveField(image.filename,
findstarmethod="sex")
except (NoSolutionAstronomyNetException):
# why can't I select this exception?
#
# there was no solution to this field.
# send the telescope back to checkPointing
# if that fails, clouds or telescope problem
# an exception will be raised there
self.log.error("No WCS solution")
if not self.checkedpointing:
if checkPointing() == True:
self.checkedpointing = True
tel.slewToRaDec(currentImageCenter)
try:
pointVerify()
return True
except CanSetScopeButNotThisField:
pass # let the caller decide whether we go to next
# field or stay on this with no verification
else:
self.checkedpointing = False
raise CanSetScopeButNotThisField(
"Able to set scope, but unable to verify this field %s" %
(currentImageCenter))
wcs = Image.fromFile(wcs_name)
ra_wcs_center = wcs["CRVAL1"] + (wcs["NAXIS1"] / 2.0 -
wcs["CRPIX1"]) * wcs["CD1_1"]
dec_wcs_center = wcs["CRVAL2"] + (wcs["NAXIS2"] / 2.0 -
wcs["CRPIX2"]) * wcs["CD2_2"]
currentWCS = Position.fromRaDec(Coord.fromD(ra_wcs_center),
Coord.fromD(dec_wcs_center))
# save the position of first trial:
if (self.ntrials == 0):
initialPosition = Position.fromRaDec(Coord.fromD(ra_img_center),
Coord.fromD(dec_img_center))
initialWCS = Position.fromRaDec(currentWCS.ra, currentWCS.dec)
# write down the two positions for later use in mount models
if (self.ntrials == 0):
logstr = "Pointing Info for Mount Model: %s %s %s" % (
image["DATE-OBS"], initialPosition, currentWCS)
self.log.info(logstr)
delta_ra = ra_img_center - ra_wcs_center
delta_dec = dec_img_center - dec_wcs_center
self.log.debug("%s %s" % (delta_ra, delta_dec))
self.log.debug("%s %s" % (ra_img_center, ra_wcs_center))
self.log.debug("%s %s" % (dec_img_center, dec_wcs_center))
# *** need to do real logging here
logstr = "%s %f %f %f %f %f %f" % (image["DATE-OBS"], ra_img_center,
dec_img_center, ra_wcs_center,
dec_wcs_center, delta_ra, delta_dec)
self.log.debug(logstr)
if (delta_ra > self["tolra"]) or (delta_dec > self["toldec"]):
print "Telescope not there yet."
print "Trying again"
self.ntrials += 1
if (self.ntrials > self["max_trials"]):
self.ntrials = 0
raise CantPointScopeException(
"Scope does not point with a precision of %f (RA) or %f (DEC) after %d trials\n"
% self["tolra"] % self["toldec"] % self["max_trials"])
tel.moveOffset(delta_ra, delta_dec)
self.pointVerify()
else:
# if we got here, we were succesfull reset trials counter
self.ntrials = 0
# and save final position
# write down the two positions for later use in mount models
logstr = "Pointing: final solution %s %s %s" % (
image["DATE-OBS"], currentImageCenter, currentWCS)
self.log.info(logstr)
return (True)
