[daip] [Fwd: image axis]
Hanno Spreeuw
hspreeuw at science.uva.nl
Tue Jun 20 09:15:30 EDT 2006
---------------------------- Original Message ----------------------------
Subject: image axis
From: "Hanno Spreeuw" <hspreeuw at science.uva.nl>
Date: Tue, June 20, 2006 14:57
To: dap at nrao.edu
--------------------------------------------------------------------------
Hello, I would like to ask a question about imagr.
If I set my cellsize too low it says "solution for restoring beam failed".
I can set a lower cellsize, but I want to map a major part of the primary
beam, so with a lower cellsize I need a larger number of pixels, 4096
instead of 2048. Then I get another message, "EXISTING IMAGE AXIS 1 SIZE
INCOMPATABLE 4096 2048", see below. There are only a few thousand
visibilities available with a uv spacing larger than 0.7. I don't want to
set uvmin any lower than 0.7.
Can you help me?
Thank you,
Hanno Spreeuw.
localh> IMAGR1: Task IMAGR (release of 31DEC04) begins
localh> IMAGR1: ZTXOP2: using translated file name =
localh> IMAGR1: ZTXOP2:
/home/hanno/aips/DA00/LOCALHOST/1806_20_0401_FINAL.CBOX
localh> IMAGR1: ZTXOP2: using translated file name =
localh> IMAGR1: ZTXOP2:
/home/hanno/aips/DA00/LOCALHOST/1806_20_0401_FINAL.CBOX
localh> IMAGR1: WINDF: Number of clean boxes/field read as follows:
localh> IMAGR1: Field 01: 6
localh> IMAGR1: Create NEWCL2 .IMAGR . 1 (UV) on disk 1 cno 21
localh> IMAGR1: Beginning channel 1 through 1 with 8 IFs
localh> IMAGR1: IMACPY: Copied 2113 visibilities to be imaged
localh> IMAGR1: UVWAIT: begin finding uniform weights
localh> IMAGR1: UVWAIT: Average grid weight 3.073E+02
localh> IMAGR1: UVWAIT: Adding temperance S 6.147E+01
localh> IMAGR1: UVWAIT: begin applying uniform or other weights
localh> IMAGR1: UVWAIT: Sum of weights in 1.936E+05 and out 3.223E+05
localh> IMAGR1: UVWAIT: Noise is increased by a factor 1.233 due to weighting
localh> IMAGR1: UVWAIT: Average summed weight 3.073E+02 over 8566 vis
localh> IMAGR1: EXISTING IMAGE AXIS 1 SIZE INCOMPATABLE 4096 2048
localh> IMAGR1: IMGATT: ERROR WITH IMAGE CLEAN field number 0001
localh> IMAGR1: CLNOPN: ERROR OPENING CLEAN process object
localh> IMAGR1: Deleting UV work file:
localh> IMAGR1: Destroyed 1 extension files of type AN
localh> IMAGR1: Destroyed 1 extension files of type FQ
localh> IMAGR1: Destroyed UV image file: catno= 21 disk= 1
localh> IMAGR1: Purports to die of UNNATURAL causes
localh> IMAGR1: localhost 31DEC04 TST: Cpu= 0.2 Real= 0
This is inp of imagr:
>inp
AIPS 1: IMAGR: Wide field imaging/Clean task
AIPS 1: Adverbs Values Comments
AIPS 1: ----------------------------------------------------------------
AIPS 1: INNAME 'NEWCL2 ' Input UV data (name)
AIPS 1: INCLASS 'CONT ' Input UV data (class)
AIPS 1: INSEQ 8 Input UV data (seq. #)
AIPS 1: INDISK 1 Input UV data disk drive #
AIPS 1: SOURCES 'SGR1806-20 ' Source name
AIPS 1: *rest ' '
AIPS 1: QUAL -1 Calibrator qualifier -1=>all
AIPS 1: CALCODE ' ' Calibrator code ' '=>all
AIPS 1: TIMERANG *all 0 Time range to use
AIPS 1: SELBAND -1 Bandwidth to select (kHz)
AIPS 1: SELFREQ -1 Frequency to select (MHz)
AIPS 1: FREQID -1 Freq. ID to select.
AIPS 1: SUBARRAY 0 Sub-array, 0=>all
AIPS 1: DOCALIB 1 If >0 calibrate data
AIPS 1: = 2 calibrate weights
AIPS 1: GAINUSE 5 CL (or SN) table to apply
AIPS 1: DOPOL -1 If >0.5 correct polarization.
AIPS 1: BLVER -1 BL table to apply.
AIPS 1: FLAGVER -1 Flag table version
AIPS 1: DOBAND -1 If >0.5 apply bandpass cal.
AIPS 1: Method used depends on value
AIPS 1: of DOBAND (see HELP file).
AIPS 1: BPVER -1 Bandpass table version
AIPS 1: SMOOTH *all 0 Smoothing function. See
AIPS 1: HELP SMOOTH for details.
AIPS 1: STOKES ' ' Stokes parameters (see HELP)
AIPS 1: BCHAN 1 Low freq. channel 0 for cont.
AIPS 1: ECHAN 0 Highest freq channel
AIPS 1: CHANNEL 0 Restart channel number
AIPS 1: NCHAV 1 Number of chan. to average.
AIPS 1: CHINC 1 Channel incr. between maps.
AIPS 1: BIF 0 First IF in average.
AIPS 1: ** press RETURN for more, enter Q or next line to quit print **
#
AIPS 1: EIF 0 Last IF in average.
AIPS 1: OUTNAME ' ' Output image name (name)
AIPS 1: OUTDISK 1 Output image disk drive #
AIPS 1: OUTSEQ 11 Output seq. no.
AIPS 1: OUTVER 1 CC ver. no (Continuum only)
AIPS 1: *** SET OUTVER ON RESTARTS
AIPS 1: IN2NAME ' ' UV work file name
AIPS 1: IN2CLASS ' ' UV work file class
AIPS 1: IN2SEQ 0 UV work file seq
AIPS 1: *** SET TO KEEP WORK FILE
AIPS 1: IN2DISK 1 UV work file disk
AIPS 1: CELLSIZE 4 4 (X,Y) size of grid in asec
AIPS 1: IMSIZE 4096 4096 Minimum image size
AIPS 1: NFIELD 1 Number of fields (max 4096)
AIPS 1: DO3DIMAG -1 > 0 => use different tangent
AIPS 1: points for each field
AIPS 1: FLDSIZE *all 0 Clean size of each field.
AIPS 1: RASHIFT *all 0 RA shift per field (asec)
AIPS 1: DECSHIFT *all 0 DEC shift per field (asec)
AIPS 1: UVTAPER 0 0 (U,V) Gaussian taper
AIPS 1: units are kilo-lambda
AIPS 1: UVRANGE 0.7 0 Min & max baseline (klambda)
AIPS 1: GUARD 0 0 x,y guard band fractional
AIPS 1: radius
AIPS 1: ROTATE 0 Rotate image CCW from N by
AIPS 1: ROTATE degrees
AIPS 1: ZEROSP *all 0 0-spacing fluxes and weights
AIPS 1: SEE HELP!!
AIPS 1: UVWTFN ' ' UV dist. weight function
AIPS 1: blank => uniform
AIPS 1: UVSIZE 0 0 Array size for doing uniform
AIPS 1: weights. 0 -> actual field
AIPS 1: size.
AIPS 1: ROBUST 0 Robustness power: -5 -> pure
AIPS 1: uniform weights, 5 => natural
AIPS 1: ** press RETURN for more, enter Q or next line to quit print **
#
AIPS 1: UVBOX 0 Additional rows and columns
AIPS 1: used in weighting.
AIPS 1: UVBXFN 1 Box function type when UVBOX
AIPS 1: > 0. 0 -> 1 round pill box.
AIPS 1: XTYPE 5 Conv. function type in x
AIPS 1: default spheroidal
AIPS 1: YTYPE 5 Conv. function type in y
AIPS 1: default spheroidal
AIPS 1: XPARM *all 0 Conv. function parms for x
AIPS 1: YPARM *all 0 Conv. function parms for y
AIPS 1: NITER 100000 Maximum # of Clean components
AIPS 1: BCOMP *all 0 Begin at BCOMP component
AIPS 1: Specify for each field.
AIPS 1: ALLOKAY 0 For restart: > 0 => beams
AIPS 1: okay, > 1 => work file too
AIPS 1: NBOXES 0 Number of boxes for Clean
AIPS 1: NB: field 1 only.
AIPS 1: CLBOX *all 0 Four coordinates for each box
AIPS 1: BOXFILE 'DA00:1806_20_0401_FINA Input file of field params
AIPS 1: L.CBOX
AIPS 1: '
AIPS 1: and Clean boxes; ' ' => use
AIPS 1: FLDSIZE, RASHIFT, DECSHIFT,
AIPS 1: NBOXES, CLBOX only.
AIPS 1: OBOXFILE 'DA00:1806_20_0401_FINA Output file for final Clean
AIPS 1: L.CBOX
AIPS 1: '
AIPS 1: boxes
AIPS 1: GAIN 0.1 Clean loop gain
AIPS 1: FLUX 0 Minimum Clean component (Jy)
AIPS 1: MINPATCH 51 Min. BEAM half-width in AP.
AIPS 1: BMAJ 0 FWHM(asec) major axis Clean
AIPS 1: restoring beam.
AIPS 1: BMIN 0 FWHM(asec) minor axis Clean
AIPS 1: restoring beam.
AIPS 1: ** press RETURN for more, enter Q or next line to quit print **
#
AIPS 1: BPA 0 Clean beam position angle
AIPS 1: OVERLAP 0 1 => restore components to
AIPS 1: overlapped fields, >=2=>
AIPS 1: expect overlaps in Cleaning
AIPS 1: PHAT 0 Prussian hat height.
AIPS 1: FACTOR 0 Speedup factor see HELP
AIPS 1: CMETHOD ' ' Modeling method:
AIPS 1: 'DFT','GRID',' '
AIPS 1: IMAGRPRM 0 0 Task enrichment parameters
AIPS 1: 0 0 (1) Antenna diameter (m)
AIPS 1: 0 0 (2) Source Spectral index
AIPS 1: 0 1.000E-05 (3) Frequency scaling factor
AIPS 1: 5 *rest 0 (4) > 0 -> SDI Clean factor
AIPS 1: (5) >0 => scale residuals
AIPS 1: (6) Half-width in x of box
AIPS 1: (7) Half-width in y of box
AIPS 1: (8) Filter components whose
AIPS 1: neighborhood is weaker than
AIPS 1: IMAGRPRM(8) Jy. 0 -> don't
AIPS 1: (9) Radius in pixels for the
AIPS 1: IMAGRPRM(8) test.
AIPS 1: (10) multiplier of image size
AIPS 1: to get beam size: 0 => 2;
AIPS 1: 2, 1, 0.5 0.25 supported
AIPS 1: (11-16) Multi-resolution
AIPS 1: added controls
AIPS 1: (19) Dynamic range limit
AIPS 1: (20) Retry factor (see help)
AIPS 1: NGAUSS 0 Number of resolutions to use
AIPS 1: WGAUSS *all 0 Resolutions in arc sec >= 0
AIPS 1: FGAUSS *all 0 Minimum flux for each resol.
AIPS 1: MAXPIXEL 0 Maximum pixels searched in
AIPS 1: each major cycle.
AIPS 1: DOTV 1 Display residuals on TV ?
AIPS 1: Start with field = DOTV
AIPS 1: ** press RETURN for more, enter Q or next line to quit print **
#
AIPS 1: BADDISK *all 0 Disks to avoid for scratch.
>
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