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CASA_oneimage.py
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CASA_oneimage.py
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"""
Pipeline to make CASA images to build lightcurve from EVLA data.
Copied from EVLA pipeline v3.3.
claw 18sep2012
Run like this:
python> execfile('CASA_makeimages.py')
"""
# prepare functions and parameters needed to image
import numpy as n
from EVLA_functions import *
doexe=True
fieldn = 6 # field number in main obs file
bbn = 'bb48'
#msname = '12A-339_sb9826039_1.56065.225594965275_f'+str(fieldn)+'c.ms'
msname = '12A-339_sb9826039_1.56065.225594965275_'+bbn+'.ms'
prefix = 'test'
#msfieldn = 0 # ms field number to image
msfieldn = fieldn # ms field number to image
scann = '117~512' # scan to image
spwfreq = 18
spwn = '0~5:5~58' # ms spw number to image
#spwn = spwfreq # ms spw number to image
doclean = 1
antennas = ''
uvr = '>80klambda'
stokesparam = 'I'
psfmoden = 'clarkstokes'
c=2.997925e8
reference_frequencies = n.array([ 8.33200000e+09, 8.46000000e+09, 3.74780000e+10, 3.76060000e+10, 3.77340000e+10, 3.78620000e+10, 3.79900000e+10, 3.81180000e+10, 3.82460000e+10, 3.83740000e+10, 2.69680000e+10, 2.70960000e+10, 2.72240000e+10, 2.73520000e+10, 2.74800000e+10, 2.76080000e+10, 2.77360000e+10, 2.78640000e+10, 4.79880000e+10, 4.81160000e+10, 4.82440000e+10, 4.83720000e+10, 4.85000000e+10, 4.86280000e+10, 4.87560000e+10, 4.88840000e+10, 3.90380000e+10, 3.91660000e+10, 3.92940000e+10, 3.94220000e+10, 3.95500000e+10, 3.96780000e+10, 3.98060000e+10, 3.99340000e+10, 2.54880000e+10, 2.56160000e+10, 2.57440000e+10, 2.58720000e+10, 2.60000000e+10, 2.61280000e+10, 2.62560000e+10, 2.63840000e+10, 1.84880000e+10, 1.86160000e+10, 1.87440000e+10, 1.88720000e+10, 1.90000000e+10, 1.91280000e+10, 1.92560000e+10, 1.93840000e+10])
#ms.open(msname)
#uv_range = ms.range(["uvdist"])
#uv_max = uv_range['uvdist'][1]
#ms.close()
uv_max = 6944.8193653207109 # for 12A-339
def getOptimumSize(size):
'''
This method takes as input the a size parameter. The return is the smallest
integer Y which satisfies the following conditions:
* Y > size
* Y = 2^a*3^b*5^c where a,b, and c are non-negative integers and at least one
of a or b is 0 and c is nonzero
'''
def evaluate(pow2, pow3, pow5):
# Convience method to calculate the value given multiples
return int(math.pow(2,pow2) *math.pow(3,pow3)*math.pow(5,pow5))
max5 = int(math.ceil(math.log(size,5)))
returnValue = evaluate(0, 0, max5)
for pow5 in range(max5,0,-1):
pow2 = math.ceil(math.log(size/math.pow(5,pow5),2))
if not pow2 < 0:
returnValue = min(returnValue, evaluate(pow2,0,pow5))
pow3 = math.ceil(math.log(size/math.pow(5,pow5),3))
if not pow3 < 0:
returnValue = min(returnValue, evaluate(0,pow3,pow5))
return returnValue
print 'field ', fieldn
print 'scan ', scann
print 'spw ', spwn
print 'bb ', bbn
wave=c/reference_frequencies[spwfreq]
cellsize=206265.*wave/uv_max/3.
mycell=str(cellsize)+'arcsec'
fwhm=206265.*wave/25.0
myimsize=getOptimumSize(fwhm/cellsize)
imname=prefix+str(fieldn)+'_scan'+str(scann)+"_spw"+str(spwn)+"_"+bbn+'_'+str(stokesparam)
if os.path.exists(imname+'.image'):
print 'Image exists. Continuing clean...'
default('clean')
vis=msname
imagename=imname
outlierfile=''
field=str(msfieldn)
scan=str(scann)
spw=str(spwn)
antenna=antennas
selectdata=True
mode='mfs'
nterms=1
reffreq=''
gridmode=''
niter=0
gain=0.1
threshold='0.0mJy'
psfmode=psfmoden
imagermode=''
multiscale=[]
mask='cleanbox'+str(fieldn)+'.txt'
interactive=False
imsize=[myimsize,myimsize]
cell=[mycell,mycell]
phasecenter=''
restfreq=''
stokes=stokesparam
weighting='natural'
uvrange=uvr
uvtaper=False
modelimage=''
restoringbeam=['']
pbcor=False
minpb=0.2
usescratch=False
calready=False
allowchunk=False
async=False
if doexe: clean()
if (doclean & os.path.exists(imname+'.residual') & (imstat(imagename=imname+'.residual')['max'][0] != 0)):
default('imstat')
imagename=imname+'.residual'
axes=-1
region=''
box=''
chans=''
stokes=stokesparam
listit=False
verbose=False
tmpout=imstat()
mythresh=str(3.*tmpout['rms'][0])+'Jy'
default('clean')
vis=msname
imagename=imname
outlierfile=''
field=str(msfieldn)
scan=str(scann)
spw=str(spwn)
antenna=antennas
selectdata=True
mode='mfs'
nterms=1
reffreq=''
gridmode=''
niter=10000
gain=0.1
threshold=mythresh
psfmode=psfmoden
imagermode=''
multiscale=[]
mask='cleanbox'+str(fieldn)+'.txt'
interactive=False
imsize=[myimsize,myimsize]
cell=[mycell,mycell]
phasecenter=''
restfreq=''
stokes=stokesparam
weighting='natural'
uvrange=uvr
uvtaper=False
modelimage=''
restoringbeam=['']
pbcor=False
minpb=0.2
usescratch=False
calready=False
allowchunk=False
async=False
if doexe: clean()
default('imstat')
imagename=imname+'.residual'
axes=-1
region=''
box=''
chans=''
stokes=stokesparam
listit=False
verbose=False
tmpout=imstat()
finalrms=tmpout['rms'][0]
# Measure max of image
default('imstat')
imagename=imname+'.image'
axes=-1
region=''
box=''
chans=''
stokes=stokesparam
listit=False
verbose=False
tmpout=imstat()
peak=tmpout['max'][0]
loc = str(tmpout['maxpos'][0]) + ',' + str(tmpout['maxpos'][1])
print(imname + ', peak=' + str(peak) + ', err=' + str(finalrms) + ', at pixel ' + loc)