[daip] cross-correlation of theoretical images

[Juan-Carlos Algaba-Marcos]

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