[WP3] Re: AssociateList question

[Jan Snigula]

Hello Kor,

I think that would be a viable solution to the problem, as I expect this
solution to be still faster than the repeated looping over the sourcelists
that would be needed to sort out the pairs matching over all the
sourcelists afterwards.

Thanks,

Jan


> Jan,
>
> I just had a look at the code and in principle your way to do this will
> NOT work. It will work for finding the singles inside the area but for
> finding pairs no area restriction us used since we only look for matches
> will will always be in the overlaping parts of two images. I will have
> to modify the queries for this which is of cource not a problem but will
> take somewhat longer than just a few minutes. What I am thinking of is
> to add an extra function to AssociateList so that you can limit the
> search area. You would do this then as follows:
>
> AL = AssociateList()
> AL.set_search_distance(2.0)
> AL.sourcelists.append(SL1)
> AL.sourcelists.append(SL2)
> AL.set_search_area(llRA,llDEC,lrRA,lrDEC,ulRA,ulDEC,urRA,urDEC)
> AL.make()
>
>
> The modified queries which take into account the search area might be
> mucht slower than the one I am using now, but experimenting with them
> might help.
>
> What do you think of this?
>
> Ciao,
>
> Kor.
>
> Jan Snigula wrote:
> > Hello Kor,
> >
> > I've got a short question about the behaviour of AssociateList. I need to
> > associate different sourcelists against on common "master" list. In
> > principle no problem, but the overlap areas might be different. So if I
> > calculate the overlapping area between all the fields (easy) and set the
> > coord ranges of the master list to these values, will AssociateList then
> > just use these values, and then associate only in the common overlap
> > region?
> >
> > Thanks,
> >
> > Jan
>
> --
>
> Dr. K.G. Begeman
> OmegaCEN
> Kapteyn Institute
> University of Groningen
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>