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I'd like to download chunks of Y4N single-epoch data, with the eventual goal of matching to Y3A1_COADD_OBJECTs. The latter data are indexed by HEALPIX number, but it doesn't look like there's a corresponding index on prod.SE_OBJECT. What's the fastest way to define and download the Y4N data in ~1 sq. deg. chunks? By exposure number? By simply defining a box in RA,DEC? Is there a way to connect SE_OBJECTs to HEALPIX pixels?

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      Dave,

      There was a table called SE_OBJECT_HPIX (and I see that it still exists) what is not clear is whether or not FIRSTCUT was updating this table.   Digging through it, it looks like there was not... Now I am checking how it was done for Y3A1_FINALCUT.  Depending on the answer I think the quickest thing would be to get a quick afterburner.   Previously, this was done with nsides=16384... but I know we eventually built a separate table for coadds that contained multiple resolutions.  Those were 32, 64, 1024, 4096, and 16384.  If I were to build a table like the one that exists with these HPIX ids would that work?

      Robert

       

      1. David Gerdes

        Robert, yes, that would be perfect. Those are the resolutions I am currently using internally.

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