I've got 180 folders (0-179), but each folder has just 10 files in it (total
1800) and they are named with a .bin extension.



Hmmmm.



Tony



From: guide-user@yahoogroups.com [mailto:guide-user@yahoogroups.com] On
Behalf Of Bill J Gray
Sent: Wednesday, March 23, 2011 1:10 PM
To: guide-user@yahoogroups.com
Subject: Re: [guide-user] use USNO B1.0 from hard drive





Hi Tony,

> I know I have seen this here before, but a quick search did not turn up
> anything - how do I set up guide to use the USNO B1.0 catalog if I have it
> on my hard drive?

It's described at

http://www.projectpluto.com/update8d.htm#b1_from_hard_drive

Please let me know if you run into issues. I don't think there are a
lot of people doing this. Given its size, B1.0 hasn't been distributed
nearly
as widely as Ax.0 or UCAC-x.

> Also - are there different version of it around? I see a lot of references
> to an 80 GB dataset, but the one I have is only about 40 GB.

It really should be around 80 GBytes, broken up into 3600 files (two for
each .1 degree of declination: an index file with a name such as b1234.acc,
and a data file with a name such as b1234.cat.) These 3600 files should in
turn be broken up into 180 folders, one folder for each degree in
declination.
The above files would be in the 123 folder, covering dec +33 to +34.

A listing of the files in the 179 folder (the one at the north celestial
pole,
dec +89 to +90) is at the end of this message.

It's possible that you have a subset of B1.0. The catalog is loaded with
marginal and false detections, especially down at the faint end. There are
various schemes for filtering out the "presumed bad" objects. If your copy
resembles the above format, but happens to be a lot smaller, then I'd start
to think that you have a filtered version. If so, you'll probably see the
same
files as below, but the .cat files will be smaller (.acc files should be the
same size.)

-- Bill

B1790 ACC 2,880 10-09-02 12:20a b1790.acc
B1790 CAT 591,840 10-09-02 12:20a b1790.cat
B1791 ACC 2,880 10-09-02 12:20a b1791.acc
B1791 CAT 557,920 10-09-02 12:20a b1791.cat
B1792 ACC 2,880 10-09-02 12:20a b1792.acc
B1792 CAT 520,080 10-09-02 12:20a b1792.cat
B1793 ACC 2,880 10-09-02 12:20a b1793.acc
B1793 CAT 474,400 10-09-02 12:20a b1793.cat
B1794 ACC 2,880 10-09-02 12:20a b1794.acc
B1794 CAT 442,160 10-09-02 12:20a b1794.cat
B1795 ACC 2,880 10-09-02 12:20a b1795.acc
B1795 CAT 344,240 10-09-02 12:20a b1795.cat
B1796 ACC 2,880 10-09-02 12:20a b1796.acc
B1796 CAT 237,680 10-09-02 12:20a b1796.cat
B1797 ACC 2,880 10-09-02 12:20a b1797.acc
B1797 CAT 161,920 10-09-02 12:20a b1797.cat
B1798 ACC 2,880 10-09-02 12:20a b1798.acc
B1798 CAT 93,760 10-09-02 12:20a b1798.cat
B1799 ACC 2,880 10-09-02 12:20a b1799.acc
B1799 CAT 25,760 10-09-02 12:20a b1799.cat





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