Re: It looks like the coords in (at least one of) the subtractions is off by almost 2 arcMINUTES.

From: Robert A. Knop Jr. (robert.a.knop@vanderbilt.edu)
Date: Sun Apr 04 2004 - 00:21:13 PST

  • Next message: Saul Perlmutter: "Re: It looks like the coords in (at least one of) the subtractions is off by almost 2 arcMINUTES."

    I think I may know what I did to screw that up. It's technical, but has
    to do with the way the images are treated in the sum.

    The short of it: the WCS in the "sum" images will often (though not
    necessarily always) be very *wrong*. This is in principle OK, since the
    database and searchscan software doesn't use the WCS at all, but it's
    own transformation structures.

    I think my mistake was in not realizing myself that the WCS was wrong,
    and in generating the database transformation structures from the WCS
    rather than doing it the right way (which is almost as easy).

    I will let you know shortly how many of them are wrong.

    Do you want me to do new subtractions to fix this problem?

    -Rob 

    -- 
--Prof. Robert Knop
  Department of Physics & Astronomy, Vanderbilt University
  robert.a.knop@vanderbilt.edu

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