[daip] HGEOM & coordinate increment

[Volker Heesen]

Hi there,

I have nice task to do: Do align a optical H_alpha with a set of radio 
continuum images. So I thought of HGEOM or OHGEO. In fact the alignment is 
perfect, but...
... the coordinate increment is affected as well. That means, that the optical 
image is blown up that much, that it doesn't fit into the image any more.

Any recipies at hand?


Best regards,

Volker Heesen

P.S.: I have attached the headers of the images.
-------------------------------------------------------------------------------------
Header of the optical image
AIPS 1: Image=ngc253ha  (MA)         Filename=N253HALPHA  .LGEOM .   1
AIPS 1: Telescope=CTIO/Mic           Receiver=nfccd
AIPS 1: Observer=D.Bomans            User #=    2
AIPS 1: Observ. date=23-AUG-2019     Map date=17-SEP-2004
AIPS 1: Minimum=-4.28193360E+07      Maximum= 7.04522560E+08 Data Val
AIPS 1: Map scale= 9.9999997E-01     Map offset= 0.0000000E+00 applied
AIPS 1: ----------------------------------------------------------------
AIPS 1: Type    Pixels   Coord value     at Pixel     Coord incr   Rotat
AIPS 1: RA---ARC   512    00 44 44.210     256.62        -72.750    0.00
AIPS 1: DEC--ARC   512   -25 35 59.039     256.62         72.750    0.84
AIPS 1: ----------------------------------------------------------------
AIPS 1: Coordinate equinox 2000.00
AIPS 1: Maximum version number of extension files of type HI is   1
---------------------------------------------------------------------------------------
Hader of theAIPS 1: Image=NGC 253   (MA)         Filename=N253CM3EFF.P.POLC  .   
2
AIPS 1: Telescope=Effelsbe           Receiver=
AIPS 1: Observer=                    User #=    2
AIPS 1: Observ. date=BAD DATE        Map date=14-SEP-2004
AIPS 1: Pixel type: FLOATING         Magic value blanking
AIPS 1: Minimum=-1.24754952E-04      Maximum= 9.92179662E-03 Jy/beam
AIPS 1: Map scale= 1.1619999E-06     Map offset= 0.0000000E+00 applied
AIPS 1: ----------------------------------------------------------------
AIPS 1: Type    Pixels   Coord value     at Pixel     Coord incr   Rotat
AIPS 1: RA---ARC   512    00 47 33.388     256.50         -5.002    0.00
AIPS 1: DEC--ARC   512   -25 17 14.071     256.50          4.999   -0.06
AIPS 1: FREQ         1   8.3500001E+09       1.00  1.1000000E+09    0.00
AIPS 1: ----------------------------------------------------------------
AIPS 1: Coordinate equinox 2000.00
AIPS 1: Map type=NORMAL              Number of iterations=       1
AIPS 1: Conv size=  90.00 X  90.00   Position angle=   0.00
AIPS 1: Maximum version number of extension files of type HI is   1
AIPS 1: Maximum version number of extension files of type PL is   8
AIPS 1: Keyword = 'ACTNOISE'  value =  8.070099E-05
AIPS 1: Keyword = 'ACTMEAN '  value =  6.218441E-05
 radio image