[daip] cross-correlation of theoretical images

[Amy Mioduszewski]

Dear Juan-Carlos,

I'm sorry, our primary expert is away.  Did the original pair of images have the 
same geometries?  Or did you just force them to be the same?  To make the image 
geometries consistent I would recommend using OHGEO.

Also I notice that the RAs are different.

Amy

Juan-Carlos Algaba-Marcos wrote:
> To whom it may concern,
> 
> I am lately working on task CONVL with theoretical and observed images. Currently I want
> to obtain the cross-correlation of a theoretical model and the corresponding synthesized
> 'observed' one. (OPCODE='IMAC') However, when I try to do so I obtain the following error:
> 
> localh> CONVL1: CONFIL: UNEQUAL SPACINGS IN TWO MAPS
> localh> CONVL1:        IMAGE=  0.0000  0.0000 CONV. FN=  0.0000  0.0000
> localh> CONVL1: Destroyed MA image file: catno=     39 disk= 2
> localh> CONVL1: Purports to die of UNNATURAL causes
> localh> CONVL1: localhost    31DEC11 TST: Cpu=       0.0  Real=       0
> 
> As the first image is a model, I have removed the blanks with task REMAG and adjusted
> all values to match the observed image with PUTHEAD. Here are the headers of both input
> images:
> 
> MODEL
> 
> AIPS 1: Image=          (MA)         Filename=MODGLJET    .REMAG .   3
> AIPS 1: Telescope=VLBI               Receiver=VLBI
> AIPS 1: Observer=                    User #= 3000
> AIPS 1: Observ. date=05-OCT-2007     Map date=16-APR-2012
> AIPS 1: Minimum= 1.71167770E-07      Maximum= 3.32765914E-02 JY/BEAM
> AIPS 1: ----------------------------------------------------------------
> AIPS 1: Type    Pixels   Coord value     at Pixel     Coord incr   Rotat
> AIPS 1: RA---SIN   102    17 45 40.041      51.00      -0.000002    0.00
> AIPS 1: DEC--SIN   102   -29 00 28.118      51.00       0.000002    0.00
> AIPS 1: ----------------------------------------------------------------
> AIPS 1: Coordinate equinox 2000.00
> AIPS 1: Map type=NORMAL              Number of iterations=     100
> AIPS 1: Conv size= 0.00002 X 0.00002   Position angle= -23.93
> AIPS 1: Maximum version number of extension files of type HI is   1
> 
> 
> OBSERVED:
> 
> AIPS 1: Image=          (MA)         Filename=ICL   JETGL .REMAG .   2
> AIPS 1: Telescope=                   Receiver=
> AIPS 1: Observer=                    User #= 3000
> AIPS 1: Observ. date=01-JAN-2000     Map date=16-APR-2012
> AIPS 1: Minimum=-1.13594451E-03      Maximum= 4.81160544E-02 JY/BEAM
> AIPS 1: ----------------------------------------------------------------
> AIPS 1: Type    Pixels   Coord value     at Pixel     Coord incr   Rotat
> AIPS 1: RA---SIN   102    00 00 00.000      51.00      -0.000002    0.00
> AIPS 1: DEC--SIN   102    12 23 59.999      51.00       0.000002    0.00
> AIPS 1: FREQ         1   2.3000000E+11       1.00  1.0000000E+09    0.00
> AIPS 1: STOKES       1  -1.0000000E+00       1.00  1.0000000E+00    0.00
> AIPS 1: ----------------------------------------------------------------
> AIPS 1: Coordinate equinox 2000.00
> AIPS 1: Map type=NORMAL              Number of iterations=    1913
> AIPS 1: Conv size= 0.00002 X 0.00002   Position angle= -23.93
> AIPS 1: Maximum version number of extension files of type HI is   1
> AIPS 1: Maximum version number of extension files of type CC is   1
> AIPS 1: Keyword = 'MAXABSU '  value =  2.242303E+10
> AIPS 1: Keyword = 'MAXBLINE'  value =  2.242303E+10
> 
> I have modified the map type (hence, iterations), conv size, coord increase, size of the
> model. However, after matching all these, I still keep receiving the same error when
> trying to cross-correlate.
> 
> I have found the same problem with OPCODE 'IMAG', but everything runs fine when I use
> OPCODE 'DGAU' or I try to autocorrelate the same image. Where can the problem be?
> 
> Thank you very much
> 
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