| 1 | import numpy |
|---|
| 2 | from asap.scantable import scantable |
|---|
| 3 | from asap._asap import stgrid |
|---|
| 4 | import pylab as pl |
|---|
| 5 | |
|---|
| 6 | class asapgrid: |
|---|
| 7 | def __init__( self, infile ): |
|---|
| 8 | self.infile = infile |
|---|
| 9 | self.outfile = None |
|---|
| 10 | self.gridder = stgrid( self.infile ) |
|---|
| 11 | |
|---|
| 12 | def setData( self, infile ): |
|---|
| 13 | self.gridder._setin( infile ) |
|---|
| 14 | |
|---|
| 15 | def setPolList( self, pollist ): |
|---|
| 16 | self.gridder._setpollist( pollist ) |
|---|
| 17 | |
|---|
| 18 | def defineImage( self, nx=-1, ny=-1, cellx='', celly='', center='' ): |
|---|
| 19 | self.gridder._defineimage( nx, ny, cellx, celly, center ) |
|---|
| 20 | |
|---|
| 21 | def setOption( self, convType='box', convSupport=-1 ): |
|---|
| 22 | self.gridder._setoption( convType, convSupport ) |
|---|
| 23 | |
|---|
| 24 | def grid( self ): |
|---|
| 25 | self.gridder._grid() |
|---|
| 26 | |
|---|
| 27 | def save( self, outfile='' ): |
|---|
| 28 | self.outfile = self.gridder._save( outfile ) |
|---|
| 29 | |
|---|
| 30 | def plot( self, plotchan=-1, plotpol=-1 ): |
|---|
| 31 | plotter = _SDGridPlotter( self.infile, self.outfile ) |
|---|
| 32 | plotter.plot( chan=plotchan, pol=plotpol ) |
|---|
| 33 | |
|---|
| 34 | class _SDGridPlotter: |
|---|
| 35 | def __init__( self, infile, outfile=None ): |
|---|
| 36 | self.infile = infile |
|---|
| 37 | self.outfile = outfile |
|---|
| 38 | if self.outfile is None: |
|---|
| 39 | self.outfile = self.infile.rstrip('/')+'.grid' |
|---|
| 40 | self.grid = None |
|---|
| 41 | self.pointing = None |
|---|
| 42 | self.data = None |
|---|
| 43 | self.nx = -1 |
|---|
| 44 | self.ny = -1 |
|---|
| 45 | self.nchan = 0 |
|---|
| 46 | self.npol = 0 |
|---|
| 47 | self.pollist = [] |
|---|
| 48 | self.cellx = 0.0 |
|---|
| 49 | self.celly = 0.0 |
|---|
| 50 | self.center = [0.0,0.0] |
|---|
| 51 | self.nonzero = [[0.0],[0.0]] |
|---|
| 52 | self.get() |
|---|
| 53 | |
|---|
| 54 | def get( self ): |
|---|
| 55 | s = scantable( self.infile, average=False ) |
|---|
| 56 | self.pointing = numpy.array( s.get_directionval() ).transpose() |
|---|
| 57 | spectra = [] |
|---|
| 58 | for i in xrange(s.nrow()): |
|---|
| 59 | spectra.append( s._getspectrum( i ) ) |
|---|
| 60 | spectra = numpy.array( spectra ).transpose() |
|---|
| 61 | self.nchan = spectra.shape[0] |
|---|
| 62 | del s |
|---|
| 63 | |
|---|
| 64 | s = scantable( self.outfile, average=False ) |
|---|
| 65 | nrow = s.nrow() |
|---|
| 66 | pols = numpy.ones( nrow, dtype=int ) |
|---|
| 67 | for i in xrange(nrow): |
|---|
| 68 | pols[i] = s.getpol(i) |
|---|
| 69 | self.pollist, indices = numpy.unique( pols, return_inverse=True ) |
|---|
| 70 | self.npol = len(self.pollist) |
|---|
| 71 | self.pollist = self.pollist[indices[:self.npol]] |
|---|
| 72 | #print 'pollist=',self.pollist |
|---|
| 73 | #print 'npol=',self.npol |
|---|
| 74 | #print 'nrow=',nrow |
|---|
| 75 | dirstring = numpy.array(s.get_direction()).take(range(0,nrow,self.npol)) |
|---|
| 76 | self.grid = numpy.array( s.get_directionval() ).take(range(0,nrow,self.npol),axis=0).transpose() |
|---|
| 77 | spectra = numpy.zeros( (self.npol,self.nchan,nrow/self.npol), dtype=float ) |
|---|
| 78 | irow = 0 |
|---|
| 79 | for i in xrange(nrow/self.npol): |
|---|
| 80 | for ip in xrange(self.npol): |
|---|
| 81 | spectra[ip,:,i] = s._getspectrum( irow ) |
|---|
| 82 | irow += 1 |
|---|
| 83 | |
|---|
| 84 | idx = 0 |
|---|
| 85 | d0 = dirstring[0].split()[-1] |
|---|
| 86 | while ( dirstring[idx].split()[-1] == d0 ): |
|---|
| 87 | idx += 1 |
|---|
| 88 | self.ny = idx |
|---|
| 89 | self.nx = nrow / (self.npol * idx ) |
|---|
| 90 | #print 'nx,ny=',self.nx,self.ny |
|---|
| 91 | |
|---|
| 92 | self.cellx = abs( self.grid[0][0] - self.grid[0][1] ) |
|---|
| 93 | self.celly = abs( self.grid[1][0] - self.grid[1][self.ny] ) |
|---|
| 94 | #print 'cellx,celly=',self.cellx,self.celly |
|---|
| 95 | |
|---|
| 96 | self.data = spectra.reshape( (self.npol,self.nchan,self.nx,self.ny) ) |
|---|
| 97 | |
|---|
| 98 | def plot( self, chan=-1, pol=-1 ): |
|---|
| 99 | if pol < 0: |
|---|
| 100 | data = self.data.mean(axis=0) |
|---|
| 101 | opt = 'averaged over pol' |
|---|
| 102 | else: |
|---|
| 103 | idx = self.pollist.tolist().index( pol ) |
|---|
| 104 | #print 'idx=',idx |
|---|
| 105 | data = self.data[idx] |
|---|
| 106 | opt = 'pol %s'%(pol) |
|---|
| 107 | if chan < 0: |
|---|
| 108 | data = data.mean(axis=0) |
|---|
| 109 | opt += ', averaged over channel' |
|---|
| 110 | else: |
|---|
| 111 | data = data[chan] |
|---|
| 112 | opt += ', channel %s'%(chan) |
|---|
| 113 | title = 'Gridded Image (%s)'%(opt) |
|---|
| 114 | pl.figure(10) |
|---|
| 115 | pl.clf() |
|---|
| 116 | pl.plot(self.grid[0],self.grid[1],'.',color='blue') |
|---|
| 117 | pl.plot(self.pointing[0],self.pointing[1],'.',color='red') |
|---|
| 118 | extent=[self.grid[0].min()-0.5*self.cellx, |
|---|
| 119 | self.grid[0].max()+0.5*self.cellx, |
|---|
| 120 | self.grid[1].min()-0.5*self.celly, |
|---|
| 121 | self.grid[1].max()+0.5*self.celly] |
|---|
| 122 | pl.imshow(data,extent=extent,origin='lower',interpolation='nearest') |
|---|
| 123 | pl.colorbar() |
|---|
| 124 | pl.xlabel('R.A. [rad]') |
|---|
| 125 | pl.ylabel('Dec. [rad]') |
|---|
| 126 | pl.title( title ) |
|---|
