[WP3] Re: AssociateList question

[Kor G. Begeman]

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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