[daip] Issue with FLATN (AIPS 2023) {External}

Fri Sep 6 12:47:22 EDT 2024

You need to add a line to $SYSUNIX/OPTIMIZE.LIS  setting routine name INTERPLATE on MACARM to 0 0 optimization.  Then COMRPL $APLOOP/INTERPLATE.  The COMLNK/$APGOOP/*.FOR and COMLNK $QPGOOP/*.FOR.  Apparently recent gfortran versions do something bad in this collection of routines used in regridding images (FLATN, OGEOM, OHGEO, and more).

Thanks for reporting this.

Eric Greisen
________________________________
From: Daip <daip-bounces at listmgr.nrao.edu> on behalf of Arti Goyal via Daip <daip at listmgr.nrao.edu>
Sent: Thursday, September 5, 2024 2:25 AM
To: aipsmail <aipsmail at nrao.edu>
Subject: [daip] Issue with FLATN (AIPS 2023) {External}

Dear colleague,

I have text installed AIPS 2023 on my Macbook Pro and it’s running smoothly. I am encountering a problem while running the task FLATN. Here I want to interpolate 25 fields into one as I have performed a wide-field imaging (610 MHz data from GMRT telescope in India).  The problem is that the task starts but doesn’t finish no matter how long I let take and I need to abort to get the terminal back. The resulting FLATNed image is junk without any intensities.

##

LOCALH> FLATN1: Task FLATN  (release of 31DEC23) begins

LOCALH> FLATN1: Create HDFN        .FLATN .   1 (MA)  on disk  1  cno  361

LOCALH> FLATN1: Field     1 included blc,trc   253  2247   773  2767

LOCALH> FLATN1: ZABORS: signal 15 received

LOCALH> FLATN1: ABORT!

##

The image header of the FLATNed image:

AIPS 1: Got(1)   disk= 1  user= 100   type=MA   HDFN.FLATN.1

AIPS 1: Image=HDF-N     (MA)         Filename=HDFN        .FLATN .   1

AIPS 1: Telescope=GMRT               Receiver=GMRT

AIPS 1: Observer=TOM                 User #=  100

AIPS 1: Observ. date=01-APR-2007     Map date=04-SEP-2024

AIPS 1: Pixel type: FLOATING         Magic value blanking

AIPS 1: Minimum= 1.00000002E+20      Maximum=-1.00000002E+20 JY/BEAM

AIPS 1: ----------------------------------------------------------------

AIPS 1: Type    Pixels   Coord value      at Pixel    Coord incr   Rotat

AIPS 1: RA---SIN  3000    12 36 49.403515  1500.00        -1.380    0.00

AIPS 1: DEC--SIN  3000    62 12 57.973953  1501.00         1.380    0.00

AIPS 1: FREQ         1   6.1737502E+08        1.00  1.375000E+07    0.00

AIPS 1: STOKES       1   1.0000000E+00        1.00  1.000000E+00    0.00

AIPS 1: ----------------------------------------------------------------

AIPS 1: Coordinate equinox 2000.00

AIPS 1: Map type=NORMAL              Number of iterations=    2413

AIPS 1: Conv size=   7.08 X   5.92   Position angle=  28.46

AIPS 1: Rest freq      0.000         Vel type: RADIO   wrt YOU

AIPS 1: Alt ref. value  0.00000E+00  wrt pixel    0.45

AIPS 1: Keyword = 'WTNOISE '  value =  1.13333679D+00

AIPS 1: Keyword = 'SUMWTIN '  value =  1.42178117D+08

AIPS 1: Keyword = 'CCFLUX  '  value =  2.569658E-02

AIPS 1: Keyword = 'CCTOTAL '  value =  1.265699E+00

AIPS 1: Keyword = 'MAXABSU '  value = -1.000000E+00

##

My box file for creating 25 fields is as below:

F 1    512 512  1380   1380

F 2    512 512   690   1380

F 3    512 512  0      1380

F 4    512 512   -690   1380

F 5    512 512   -1380  1380

F 6    512 512  1380   690

F 7    512 512  690    690

F 8    512 512  0       690

F 9    512 512   -690    690

F 10   512 512   -1380   690

F 11   512 512  1380   0

F 12   512 512   690   0

F 13   512 512   0 0

F 14   512 512   -690   0

F 15   512 512   -1380  0

F 16   512 512  1380  -690

F 17   512 512   690  -690

F 18   512 512   0     -690

F 19   512 512   -690  -690

F 20   512 512   -1380 -690

F 21   512 512  1380  -1380

F 22   512 512  690   -1380

F 23   512 512   0    -1380

F 24   512 512  -690  -1380

F 25   512 512  -1380 -1380

##

I will greatly appreciate any help in this regard.

Thank you.

Arti Goyal

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