[daip] shifting an imagr

[Eric Greisen]

On 12/16/2016 02:03 PM, Farhad Zadeh wrote:
> Hi Eric,
> Sorry for this simple question. I have a radio image that I need to
> shift  by x and y arcseconds in RA DEC to the NE in order to register
> the image with
> an IR image. I can go though RA dec and piel positions for a star but I
> thought there was a simpler task that would shift the entire image by
> some some amount.
> I appreciate your letting me know.
> Best,
> farhad
OHGEO and HGEOM can shift one image to match the coordinates of another.
They do assume that the coordinates of both images are correct.

I am unclear what you actually want to do - have the image at the 
correct coordinates but have those be at some different pixel number 
than currently?  Or do you want to change the coordinate labeling 
assuming that you have it wrong for some reason?  (Optical has suffered 
from that in the past but less so these days.)

There are also OGEOM and LGEOM that do simpler shifts and re-grids.  And 
of course IMAGR can do RASHIFT and DECSHIFT which changes the 
coordinates of the center pixel.

Eric