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dkirkby / bossdata

Tools for accessing SDSS BOSS data
MIT License
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Determining if a given fiber is pointing at the sky #44

Closed dcunning11235 closed 9 years ago

dcunning11235 commented 9 years ago

Is there a better way of determining if a given fiber is pointing at the sky than looking for ZWARNING values in (1,5) that anyone is aware of? I see that I can determine from spPlate (OBJTYPE startswith 'SKY'), but I don't know that this is actually 'better' as it involves ~100MB download per plate and some extra/new work. :)

This is fine to start work with, just wondering if I'm missing a better solution.

dmargala commented 9 years ago

A lot of information is duplicated across the entire sdss data model. The spAll catalog file will typically have most of the information you want. If you look at this page, you can see that spAll has the OBJTYPE keyword and that it is propagated from spZbest.

dkirkby commented 9 years ago

Even better, OBJTYPE is in the lite meta file.

On Tue, Jun 23, 2015 at 11:15 AM Daniel notifications@github.com wrote:

A lot of information is duplicated across the entire sdss data model. The spAll catalog file will typically have most of the information you want. If you look at this page http://data.sdss3.org/datamodel/files/BOSS_SPECTRO_REDUX/RUN2D/spAll.html, you can see that spAll has the OBJTYPE keyword and that it is propagated from spZbest.

— Reply to this email directly or view it on GitHub https://github.com/dkirkby/bossdata/issues/44#issuecomment-114594124.

dcunning11235 commented 9 years ago

doh!