Can I give TweakReg my own solutions?

gunninggunning Member, Institute_Staff Posts: 10
I know my image offsets from when I did photometry. How can I give this information to TweakReg to apply to the WCS solution?
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  • abowersabowers Member, Institute_Staff Posts: 6
    edited December 2014
    I've worked on a similar problem recently and the way I did it did not involve TweakReg. I used:

    pyraf> from drizzlepac import updatehdr
    pyraf> updatehdr.update_from_shiftfile('shiftfile.txt')

    to apply the shifts I had to the headers of my FLTs. Then, I ran astrodrizzle with those new FLTs. I used this way because I only had one source in my image. Do you have the same problem?
  • gunninggunning Member, Institute_Staff Posts: 10
    No, I have a lot of extended sources and only a few point sources.
  • abowersabowers Member, Institute_Staff Posts: 6
    O ok well you could use source extractor to generate a source catalog and use that as import for TweakReg.

    Take look at this website:
    http://documents.stsci.edu/hst/HST_overview/documents/DrizzlePac/ch63.html#583949
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