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> Clicking on one of Ben Shneiderman's treemapping projects reminded me that > I've always thought treemaps [1] would serve well as a browsing interface > for library and archive collections because they work well with hierarchical > 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 [1] or Wikipedia [2] seems tantalisingly close, but there's a whole lot of manual effort in turning these (incomplete) ranges into something usable. Cheers David [1] http://www.loc.gov/catdir/cpso/lcco/ [2] http://en.wikipedia.org/wiki/Library_of_Congress_Classification -- oʇɐʞıɐʍ ɟo ʎʇısɹǝʌıun uɐıɹɐɹqıן sɯǝʇsʎs