| 1 | import numpy
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| 2 | from asap import rcParams
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| 3 | from asap.scantable import scantable
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| 4 | from asap.selector import selector
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| 5 | from asap._asap import stgrid
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| 6 | import pylab as pl
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| 7 | from logging import asaplog
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| 8 |
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| 9 | class asapgrid:
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| 10 | def __init__( self, infile ):
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| 11 | self.infile = infile
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| 12 | self.outfile = None
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| 13 | self.gridder = stgrid( self.infile )
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| 14 | self.ifno = None
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| 15 |
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| 16 | def setData( self, infile ):
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| 17 | self.gridder._setin( infile )
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| 18 |
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| 19 | def setIF( self, ifno ):
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| 20 | self.ifno = ifno
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| 21 | self.gridder._setif( self.ifno )
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| 22 |
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| 23 | def setPolList( self, pollist ):
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| 24 | self.gridder._setpollist( pollist )
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| 25 |
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| 26 | def setScanList( self, scanlist ):
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| 27 | self.gridder._setscanlist( scanlist )
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| 28 |
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| 29 | def defineImage( self, nx=-1, ny=-1, cellx='', celly='', center='' ):
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| 30 | self.gridder._defineimage( nx, ny, cellx, celly, center )
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| 31 |
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| 32 | def setFunc( self, func='box', width=-1 ):
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| 33 | self.gridder._setfunc( func, width )
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| 34 |
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| 35 | def setWeight( self, weightType='uniform' ):
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| 36 | self.gridder._setweight( weightType )
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| 37 |
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| 38 | def grid( self ):
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| 39 | self.gridder._grid()
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| 40 |
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| 41 | def save( self, outfile='' ):
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| 42 | self.outfile = self.gridder._save( outfile )
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| 43 |
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| 44 | def plot( self, plotchan=-1, plotpol=-1 ):
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| 45 | import time
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| 46 | t0=time.time()
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| 47 | # to load scantable on disk
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| 48 | storg = rcParams['scantable.storage']
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| 49 | rcParams['scantable.storage'] = 'disk'
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| 50 | plotter = _SDGridPlotter( self.infile, self.outfile, self.ifno )
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| 51 | plotter.plot( chan=plotchan, pol=plotpol )
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| 52 | # back to original setup
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| 53 | rcParams['scantable.storage'] = storg
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| 54 | t1=time.time()
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| 55 | asaplog.push('plot: elapsed time %s sec'%(t1-t0))
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| 56 | asaplog.post('DEBUG','asapgrid.plot')
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| 57 |
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| 58 | class _SDGridPlotter:
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| 59 | def __init__( self, infile, outfile=None, ifno=0 ):
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| 60 | self.infile = infile
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| 61 | self.outfile = outfile
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| 62 | if self.outfile is None:
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| 63 | self.outfile = self.infile.rstrip('/')+'.grid'
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| 64 | self.grid = None
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| 65 | self.pointing = None
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| 66 | self.nx = -1
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| 67 | self.ny = -1
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| 68 | self.nchan = 0
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| 69 | self.npol = 0
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| 70 | self.pollist = []
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| 71 | self.cellx = 0.0
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| 72 | self.celly = 0.0
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| 73 | self.center = [0.0,0.0]
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| 74 | self.nonzero = [[0.0],[0.0]]
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| 75 | self.ifno = ifno
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| 76 | self.get()
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| 77 |
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| 78 | def get( self ):
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| 79 | s = scantable( self.infile, average=False )
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| 80 | sel = selector()
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| 81 | sel.set_ifs( self.ifno )
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| 82 | s.set_selection( sel )
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| 83 | self.pointing = numpy.array( s.get_directionval() ).transpose()
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| 84 | self.nchan = len(s._getspectrum(0))
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| 85 | s.set_selection()
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| 86 | del s
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| 87 | del sel
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| 88 |
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| 89 | s = scantable( self.outfile, average=False )
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| 90 | nrow = s.nrow()
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| 91 | pols = numpy.ones( nrow, dtype=int )
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| 92 | for i in xrange(nrow):
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| 93 | pols[i] = s.getpol(i)
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| 94 | self.pollist, indices = numpy.unique( pols, return_inverse=True )
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| 95 | self.npol = len(self.pollist)
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| 96 | self.pollist = self.pollist[indices[:self.npol]]
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| 97 | #print 'pollist=',self.pollist
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| 98 | #print 'npol=',self.npol
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| 99 | #print 'nrow=',nrow
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| 100 | dirstring = numpy.array(s.get_direction()).take(range(0,nrow,self.npol))
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| 101 | self.grid = numpy.array( s.get_directionval() ).take(range(0,nrow,self.npol),axis=0).transpose()
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| 102 |
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| 103 | idx = 0
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| 104 | d0 = dirstring[0].split()[-1]
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| 105 | while ( dirstring[idx].split()[-1] == d0 ):
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| 106 | idx += 1
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| 107 |
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| 108 | self.ny = idx
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| 109 | self.nx = nrow / (self.npol * idx )
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| 110 | #print 'nx,ny=',self.nx,self.ny
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| 111 |
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| 112 | self.cellx = abs( self.grid[0][0] - self.grid[0][1] )
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| 113 | self.celly = abs( self.grid[1][0] - self.grid[1][self.ny] )
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| 114 | #print 'cellx,celly=',self.cellx,self.celly
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| 115 |
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| 116 | def plot( self, chan=-1, pol=-1 ):
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| 117 | if pol < 0:
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| 118 | opt = 'averaged over pol'
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| 119 | else:
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| 120 | opt = 'pol %s'%(pol)
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| 121 | if chan < 0:
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| 122 | opt += ', averaged over channel'
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| 123 | else:
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| 124 | opt += ', channel %s'%(chan)
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| 125 | data = self.getData( chan, pol )
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| 126 | title = 'Gridded Image (%s)'%(opt)
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| 127 | pl.figure(10)
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| 128 | pl.clf()
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| 129 | pl.plot(self.grid[0],self.grid[1],',',color='blue')
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| 130 | pl.plot(self.pointing[0],self.pointing[1],',',color='green')
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| 131 | extent=[self.grid[0].min()-0.5*self.cellx,
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| 132 | self.grid[0].max()+0.5*self.cellx,
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| 133 | self.grid[1].min()-0.5*self.celly,
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| 134 | self.grid[1].max()+0.5*self.celly]
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| 135 | pl.imshow(data,extent=extent,origin='lower',interpolation='nearest')
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| 136 | pl.colorbar()
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| 137 | pl.xlabel('R.A. [rad]')
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| 138 | pl.ylabel('Dec. [rad]')
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| 139 | pl.title( title )
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| 140 |
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| 141 | def getData( self, chan=-1, pol=-1 ):
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| 142 | if chan == -1:
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| 143 | spectra = self.__chanAverage()
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| 144 | else:
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| 145 | spectra = self.__chanIndex( chan )
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| 146 | data = spectra.reshape( (self.npol,self.nx,self.ny) )
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| 147 | if pol == -1:
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| 148 | retval = data.mean(axis=0)
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| 149 | else:
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| 150 | retval = data[pol]
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| 151 | return retval
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| 152 |
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| 153 | def __chanAverage( self ):
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| 154 | s = scantable( self.outfile, average=False )
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| 155 | nrow = self.nx * self.ny
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| 156 | spectra = numpy.zeros( (self.npol,nrow/self.npol), dtype=float )
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| 157 | irow = 0
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| 158 | sp = [0 for i in xrange(self.nchan)]
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| 159 | for i in xrange(nrow/self.npol):
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| 160 | for ip in xrange(self.npol):
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| 161 | sp = s._getspectrum( irow )
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| 162 | spectra[ip,i] = numpy.mean( sp )
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| 163 | irow += 1
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| 164 | return spectra
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| 165 |
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| 166 | def __chanIndex( self, idx ):
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| 167 | s = scantable( self.outfile, average=False )
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| 168 | nrow = self.nx * self.ny
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| 169 | spectra = numpy.zeros( (self.npol,nrow/self.npol), dtype=float )
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| 170 | irow = 0
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| 171 | sp = [0 for i in xrange(self.nchan)]
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| 172 | for i in xrange(nrow/self.npol):
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| 173 | for ip in xrange(self.npol):
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| 174 | sp = s._getspectrum( irow )
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| 175 | spectra[ip,i] = sp[idx]
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| 176 | irow += 1
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| 177 | return spectra
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| 178 |
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| 179 |
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