| 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.nx = -1 |
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| 65 | self.ny = -1 |
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| 66 | self.nchan = 0 |
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| 67 | self.npol = 0 |
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| 68 | self.pollist = [] |
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| 69 | self.cellx = 0.0 |
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| 70 | self.celly = 0.0 |
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| 71 | self.center = [0.0,0.0] |
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| 72 | self.nonzero = [[0.0],[0.0]] |
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| 73 | self.ifno = ifno |
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| 74 | self.tablein = None |
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| 75 | self.nrow = 0 |
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| 76 | self.blc = None |
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| 77 | self.trc = None |
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| 78 | self.get() |
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| 79 | |
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| 80 | def get( self ): |
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| 81 | self.tablein = scantable( self.infile, average=False ) |
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| 82 | sel = selector() |
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| 83 | sel.set_ifs( self.ifno ) |
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| 84 | self.tablein.set_selection( sel ) |
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| 85 | self.nchan = len(self.tablein._getspectrum(0)) |
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| 86 | self.nrow = self.tablein.nrow() |
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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 | |
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| 101 | idx = 0 |
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| 102 | d0 = s.get_direction( 0 ).split()[-1] |
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| 103 | while ( s.get_direction(self.npol*idx).split()[-1] == d0 ): |
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| 104 | idx += 1 |
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| 105 | |
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| 106 | self.nx = idx |
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| 107 | self.ny = nrow / (self.npol * idx ) |
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| 108 | #print 'nx,ny=',self.nx,self.ny |
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| 109 | |
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| 110 | self.blc = s.get_directionval( 0 ) |
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| 111 | self.trc = s.get_directionval( nrow-self.npol ) |
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| 112 | #print self.blc |
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| 113 | #print self.trc |
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| 114 | incrx = s.get_directionval( self.npol ) |
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| 115 | incry = s.get_directionval( self.nx*self.npol ) |
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| 116 | self.cellx = abs( self.blc[0] - incrx[0] ) |
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| 117 | self.celly = abs( self.blc[1] - incry[1] ) |
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| 118 | #print 'cellx,celly=',self.cellx,self.celly |
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| 119 | |
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| 120 | def plot( self, chan=-1, pol=-1 ): |
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| 121 | if pol < 0: |
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| 122 | opt = 'averaged over pol' |
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| 123 | else: |
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| 124 | opt = 'pol %s'%(pol) |
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| 125 | if chan < 0: |
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| 126 | opt += ', averaged over channel' |
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| 127 | else: |
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| 128 | opt += ', channel %s'%(chan) |
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| 129 | data = self.getData( chan, pol ) |
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| 130 | title = 'Gridded Image (%s)'%(opt) |
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| 131 | pl.figure(10) |
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| 132 | pl.clf() |
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| 133 | # plot grid position |
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| 134 | x = numpy.arange(self.blc[0],self.trc[0]+0.5*self.cellx,self.cellx,dtype=float) |
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| 135 | #print 'len(x)=',len(x) |
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| 136 | #print 'x=',x |
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| 137 | ybase = numpy.ones(self.ny,dtype=float)*self.blc[1] |
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| 138 | #print 'len(ybase)=',len(ybase) |
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| 139 | incr = self.celly |
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| 140 | for iy in xrange(self.ny): |
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| 141 | y = ybase + iy * incr |
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| 142 | #print y |
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| 143 | pl.plot(x,y,',',color='blue') |
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| 144 | # plot observed position |
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| 145 | irow = 0 |
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| 146 | while ( irow < self.nrow ): |
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| 147 | chunk = self.getPointingChunk( irow ) |
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| 148 | #print chunk |
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| 149 | pl.plot(chunk[0],chunk[1],',',color='green') |
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| 150 | irow += chunk.shape[1] |
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| 151 | #print irow |
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| 152 | # show image |
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| 153 | extent=[self.blc[0]-0.5*self.cellx, |
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| 154 | self.trc[0]+0.5*self.cellx, |
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| 155 | self.blc[1]-0.5*self.celly, |
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| 156 | self.trc[1]+0.5*self.celly] |
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| 157 | pl.imshow(data,extent=extent,origin='lower',interpolation='nearest') |
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| 158 | pl.colorbar() |
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| 159 | pl.xlabel('R.A. [rad]') |
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| 160 | pl.ylabel('Dec. [rad]') |
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| 161 | pl.title( title ) |
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| 162 | |
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| 163 | def getPointingChunk( self, irow ): |
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| 164 | numchunk = 1000 |
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| 165 | nrow = min( self.nrow-irow, numchunk ) |
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| 166 | #print 'nrow=',nrow |
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| 167 | v = numpy.zeros( (2,nrow), dtype=float ) |
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| 168 | idx = 0 |
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| 169 | for i in xrange(irow,irow+nrow): |
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| 170 | d = self.tablein.get_directionval( i ) |
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| 171 | v[0,idx] = d[0] |
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| 172 | v[1,idx] = d[1] |
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| 173 | idx += 1 |
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| 174 | return v |
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| 175 | |
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| 176 | def getData( self, chan=-1, pol=-1 ): |
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| 177 | if chan == -1: |
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| 178 | spectra = self.__chanAverage() |
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| 179 | else: |
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| 180 | spectra = self.__chanIndex( chan ) |
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| 181 | data = spectra.reshape( (self.npol,self.ny,self.nx) ) |
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| 182 | if pol == -1: |
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| 183 | retval = data.mean(axis=0) |
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| 184 | else: |
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| 185 | retval = data[pol] |
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| 186 | #retval[0][self.nx-1] = -1.0 |
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| 187 | return retval |
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| 188 | |
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| 189 | def __chanAverage( self ): |
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| 190 | s = scantable( self.outfile, average=False ) |
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| 191 | nrow = s.nrow() |
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| 192 | spectra = numpy.zeros( (self.npol,nrow/self.npol), dtype=float ) |
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| 193 | irow = 0 |
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| 194 | sp = [0 for i in xrange(self.nchan)] |
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| 195 | for i in xrange(nrow/self.npol): |
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| 196 | for ip in xrange(self.npol): |
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| 197 | sp = s._getspectrum( irow ) |
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| 198 | spectra[ip,i] = numpy.mean( sp ) |
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| 199 | irow += 1 |
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| 200 | return spectra |
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| 201 | |
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| 202 | def __chanIndex( self, idx ): |
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| 203 | s = scantable( self.outfile, average=False ) |
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| 204 | nrow = s.nrow() |
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| 205 | spectra = numpy.zeros( (self.npol,nrow/self.npol), dtype=float ) |
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| 206 | irow = 0 |
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| 207 | sp = [0 for i in xrange(self.nchan)] |
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| 208 | for i in xrange(nrow/self.npol): |
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| 209 | for ip in xrange(self.npol): |
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| 210 | sp = s._getspectrum( irow ) |
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| 211 | spectra[ip,i] = sp[idx] |
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| 212 | irow += 1 |
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| 213 | return spectra |
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| 214 | |
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| 215 | |
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