[Fwd: RE: Scope of registry-- one more thing]

[Marco Leoni]

-------- Original Message --------
Subject: RE: Scope of registry-- one more thing
Date: Wed, 5 Feb 2003 09:23:38 -0500
From: "Alex Szalay" <szalay at jhu.edu>
To: "Alex Szalay" <szalay at jhu.edu>, "Tony Linde" <ael at star.le.ac.uk>, 
"Clive Page" <cgp at star.le.ac.uk>, <registry at ivoa.net>, <metadata at us-vo.org>



One more thought added/left out:

the intersect function can then be called recursively, if
we do a cross-match among multiple surveys. The final result
is the common area of all the surveys inside the initial
are specified.

Metacode in quasi-C:

AREA aa = ".....";

aa = survey1.intersect(aa,20);
aa = survey2.intersect(aa,20);
aa = survey3.intersect(aa,20);

now aa has the common area of the initial aa and the three
surveys, with our given tolerance.

Cheers, Alex



-- 


------------------------------------------------------------------------
Marco Leoni <http://www.eso.org/%7Emleoni>
  AVO <http://www.euro-vo.org>  System/Software Engineer

tel: (+49 89) 3200 6560
fax: (+49 89) 3200 6480

European Southern Observatory <http://www.eso.org>
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