A couple years ago, I used a crossmap of LC call numbers to subject
headings (admittedly out of date) to provide subject-labeled sort by call
number on an experimental catalog
The mapping came from Mona Scott. Conversion
I don't know how robust this is, but try searching a word that will appear
across subject areas, like "brown", to see the classification/subject
I read the tables into a database, and in a batch process, coded each call
number division by how deep into the hierarchy it was linked - the number
of indents from 1 to 6. My ambition was to then try to find the most
frequently used subject headings in each step of the hierarchy (limited to
a workable range) to try to generate some semantic-net-like set of links
between subject headings and classification. But I never was able to
pursue that goal.
Cindy Harper, Systems Librarian
Colgate University Libraries
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On Sun, Oct 30, 2011 at 5:58 PM, David Friggens <[log in to unmask]>wrote:
> > Clicking on one of Ben Shneiderman's treemapping projects reminded me
> > I've always thought treemaps  would serve well as a browsing interface
> > for library and archive collections because they work well with
> > data.
> I played around with this earlier in the year, wanting to provide a
> drill-down into our collections by call number.
> For our Education Library's Teaching Collection, I used a three-level
> visualisation of items based on Dewey hierarchy, and coloured by the
> proportion of "new" (post 2006) items. I never put it online anywhere,
> so have attached it here.
> Dewey was pretty easy to get labels for the first three levels, and
> that seemed reasonable enough for most areas. But the majority of our
> items are LCC, and that's where I ran aground. The labels for the
> first two letters are readily available, but far too general to make
> this interesting. I couldn't seem to find any useful data in machine
> readable format. Sourcing another level down from LoC  or Wikipedia
>  seems tantalisingly close, but there's a whole lot of manual
> effort in turning these (incomplete) ranges into something usable.
>  http://www.loc.gov/catdir/cpso/lcco/
>  http://en.wikipedia.org/wiki/Library_of_Congress_Classification
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