[daip] kntr

[Eric Greisen]

Andreea Petric writes:
 > 

 > KNTR 1: TICINC: POSITION ROUTINES FAIL ON THIS IMAGE
 > KNTR 1: TICINC: POSITION ROUTINES FAIL ON THIS IMAGE

 > The header of this image  is :
 > AIPS 1: Image=10 N      (MA)         Filename=G233        .TRANS .   1
 > AIPS 1: Telescope=2.5m               Receiver=
 > AIPS 1: Observer=                    User #=  626
 > AIPS 1: Observ. date=22-MAR-1999     Map date=15-APR-2003
 > AIPS 1: Minimum= 1.03900000E+03      Maximum= 3.30400000E+04 DNs
 > AIPS 1: ----------------------------------------------------------------
 > AIPS 1: Type    Pixels   Coord value     at Pixel     Coord incr   Rotat
 > AIPS 1: RA---TAN  1489    10 02 51.750     744.50       3600.000    0.00
 > AIPS 1: DEC--TAN  2048   -00 56 38.502    1024.50       3600.000    0.00

                                                           ^^^^^^^^
            This says that the pixels are separated by 3600 arc sec or
1 degree.  Thus the whole image is >> 180 degrees which is the limit
on a -TAN.  The coordinate spacing and rotation may have been read in
with a CDi_j matrix.  Do a PRTHI to see if those keywords are there.

CD1_1 = CDELT1 * cos(rho)
CD1_2 = -CDELT2 * sin(rho)
CD2_1 = CDELT1 * sin(rho)
CD2_2 = CDELT2 * cos(rho)

Use PUTHEAD with keywords CDELT1 and CDELT2 for the increments (in
degrees) and CROTA2 for the rotation (rho in degrees)

Eric Greisen


 > AIPS 1: ----------------------------------------------------------------
 > AIPS 1: Coordinate equinox 2000.00
 > AIPS 1: Maximum version number of extension files of type HI is   1
 > AIPS 1: Maximum version number of extension files of type ST is   1
 > AIPS 1: Maximum version number of extension files of type PL is   1
 > 
 > What would you suggest? 
 > Many thanks
 > Andreea
 > 
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