[daip] forwarded message from Eric Greisen

[Eric Greisen]

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From: Eric Greisen <egreisen at nrao.edu>
To: Jessica Krick <jkrick at whalen.astro.lsa.umich.edu>
Cc: daips at cv.nrao.edu
Subject: Re: [forwarded from Jessica Krick] aips help
Date: Mon, 24 Jul 2000 16:49:26 -0400

Jessica Krick writes:
 > 
 > here are the imheader outputs for the two images that I tried to overlay.
 > I have not yet tried re-gridding them, however I still can't figure out
 > why trying to overlay one image on itself gives me the same
 > "not-coincident " error.

        I asked for the INPUTS to TVRGB to try to figure that out.

 > 
 > 
 > AIPS 1: Image=ngc3783   (MA)         Filename=ngc3783     .IMAP  .   1
 > AIPS 1: Telescope=ATCA               Receiver=
 > AIPS 1: Observer=tao                 User #=   15
 > AIPS 1: Observ. date=BAD DATE        Map date=19-JUL-2000
 > AIPS 1: Minimum= 6.94609284E-01      Maximum= 3.23101379E+02 JY/BEAM
 > AIPS 1: ----------------------------------------------------------------
 > AIPS 1: Type    Pixels   Coord value     at Pixel     Coord incr   Rotat
 > AIPS 1: RA---CAR   296    11 39 01.999     129.00        -16.000    0.00
 > AIPS 1: DEC--CAR   344   -37 46 00.003     217.00         26.100    0.00
 > AIPS 1: VELO-LSR     1   2.3900000E+05      -3.00  5.1000000E+04    0.00

    This is very odd - was the image re-gridded on Cartesian
coordinates?  By what program?  The ATCA takes data in NCP or SIN
coordinates, both of which AIPS understands.  I would want to know for
sure what -CAR actually means.

 > AIPS 1: ----------------------------------------------------------------
 > AIPS 1: Coordinate equinox 2000.00
 > AIPS 1: Map type=DIRTY               Number of iterations=       0
 > AIPS 1: Conv size=  59.59 X  38.28   Position angle=   0.00
 > AIPS 1: Maximum version number of extension files of type HI i
 > 
 > 
 > 
 > 
 > AIPS 1: Image=f080h000  (MA)         Filename=f080h000    .IMAP  .   2
 > AIPS 1: Telescope=IRAS               Receiver=ISSA-I
 > AIPS 1: Observer=                    User #=   15
 > AIPS 1: Observ. date=BAD DATE        Map date=BAD DATE
 > AIPS 1: Minimum= 4.94171953E+00      Maximum= 1.29746838E+01 MJY/SR
 > AIPS 1: ----------------------------------------------------------------
 > AIPS 1: Type    Pixels   Coord value     at Pixel     Coord incr   Rotat
 > AIPS 1: RA---TAN   100    11 16 00.000      50.00        -90.000    0.00
 > AIPS 1: DEC--TAN   100   -40 00 00.000      50.00         90.000    0.00
 > AIPS 1: LAMBDA       1   1.0000000E-04       1.00  1.0000000E+00    0.00
 > AIPS 1:
- ----------------------------------------------------------------

    Note that this image has very different coordinate: type, center
value, increment, etc.  A major regridding is required before each
pixel of one image can be displayed atop each corresponding pixel of
the other.  Note that even the epochs are different and EPOSW will be
needed as well.

 > AIPS 1: Coordinate equinox 1950.00
 > AIPS 1: Maximum version number of extension files of type HI is   1
 > >

   Eric
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