[daip] FLATN

[Lawrence Rudnick]

Some issues with FLATN, inputs are below.  Trying to put together whole 
NVSS survey, with preprocessed reduced images. This kind of thing has 
worked well in past with '-ait' COOTYPE.

If I use cootype '-NCP', the header on the output file says it's SIN 
projection.

If I use cootype '-MER', with everything else the same, it doesn't 
include any fields in the output, so just makes an unfilled map with 
-1e20 to +1e20 in header and no valid pixels.

thanks.  lr


AIPS 1: FLATN: Re-grid multiple fields and pointings to one image
AIPS 1: Adverbs     Values                 Comments
AIPS 1: ----------------------------------------------------------------
AIPS 1:                                    Input images
AIPS 1: INNAME     'NVSS_OPN11Z'              Image name (name)
AIPS 1: INCLASS    'IO0001'                   Image name (class)
AIPS 1: INSEQ         1                       Image name (seq. #)
AIPS 1:                                          (specify)
AIPS 1: INDISK        2                       Image disk drive #
AIPS 1: NFIELD     2326                    Max number of fields per
AIPS 1:                                       pointing
AIPS 1: NMAPS         1                    Number of pointings
AIPS 1:                                    Output image
AIPS 1: OUTNAME    ' '                        Image name (name)
AIPS 1: OUTCLASS   ' '                        Image name (class)
AIPS 1: OUTSEQ        0                       Image name (seq. #)
AIPS 1: OUTDISK       1                       Image disk drive #
AIPS 1: IMSIZE     6480        3240        Output image size in pixels
AIPS 1: COORDINA     12        *rest 0     Central pixel coordinate
AIPS 1:                                    all 0 => use observed
AIPS 1: COOTYPE    '-MER'                  Desired projection type
AIPS 1: COOINC      -40          40        Desired coordinate increment
AIPS 1: COOREF     3240        1620        Desired reference pixel
AIPS 1: ROTATE        0                    Rotation to be used (deg)
AIPS 1: REWEIGHT      4           0        (1) Interpolation halfwidth
AIPS 1:                                    (2) Minimum fraction of good
AIPS 1:                                        pixels required (0->1/3)
AIPS 1: WEIGHTIT      0                    Weight image down by WEIGHTIT
AIPS 1: ** press RETURN for more, enter Q or next line to quit print **
#
AIPS 1:                                    times radius from center in "
AIPS 1: EDGSKP        2                    Skip pixels around the edges
AIPS 1:                                    inscribed ellipse also used
AIPS 1: OPTYPE     ' '                     For mosaics only (NMAPS>1)
AIPS 1:                                    compute and output expected
AIPS 1:                                    noise ('NOIS') or weight
AIPS 1:                                    ('WEIG').
AIPS 1: APARM      *all 0                  (1) >0 => do 3-D corr.
AIPS 1:                                       ONLY for snapshots
AIPS 1:                                    (2) Parallactic angle (deg)
AIPS 1:                                    (3) Zenith angle (deg)
AIPS 1:                                    (4-8) radial scaling parms
AIPS 1:                                    (9) Linear scaling
AIPS 1: PBPARM        1           1        Beam parameters (NMAPS > 1)
AIPS 1:            *rest 0                 (1) Cutoff; (2) Use (3)-(7)
AIPS 1:                                    (3)-(7) Beam shape
AIPS 1: NOISE      *all 0                  Relative uncertainties by
AIPS 1:                                    pointing: 0 -> image header
AIPS 1: BADDISK    *all 0                  Disks to avoid for scratch

-- 
Lawrence Rudnick
Distinguished Teaching Professor
Minnesota Institute for Astrophysics
School of Physics and Astronomy
University of Minnesota
http://umn.edu/~larry  larry at umn.edu

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