Deep zooming a large 2D tree

Here's a quick demo of a 2D large tree viewer that I'm working on. The aim is to provide a simple way to view and navigate very large trees (such as the NCBI classification) in a web browser using just HTML and Javascript. At the moment this is simply a viewer, but the goal is to add the ability to show "tracks" like a genome browser. For example, you could imagine columns appearing to the right of the tree showing you whether there are phylogenies available for these taxa in TreeBASE, images from Wikipedia, sparklines for sequencing activity over time, etc. I'll blog some more on the implementation details when I get the chance, but it's pretty straightforward. Image tiles are generated from SVG images of tree using ImageMagick, labelling is applied on the fly using GIS-style queries to a MySQL database that holds the "world coordinates" of the nodes in the tree (see discussion of world coordinates on Google's Map API pages), and the zooming and tile fetching is based on Michal Migurski's Giant-Ass Image Viewer. Once I've tidied up a few things I'll put up a live demo so people can play with it.

Deep tree zooming from Roderic Page on Vimeo.

Web Hooks and OpenURL: the screencast

Yesterday I posted notes on Web Hooks and OpenURL. That post was written when I was already late (you know, when you say to yourself "yeah, I've got time, it'll just take 5 minutes to finish this..."). The Web Hooks + OpenURL project is still very much a work in progress, but I thought a screen cast would help explain why I think this is going to make my life a lot easier. It shows an example where I look at a bibliographic record in one database (AFD, the Australian Faunal Directory on CouchDB), click on a link that takes me to BioStor — where I can find the reference in BHL — then simply click on a button on the BioStor page to "automagically" update the AFD database. The "magic" is the Web Hook. The link I click on in the AFD database contains the identifier for that entry in the AFD, as well a a URL BioStor can call when it's found the reference (that URL is the "web hook").

Using Web Hooks and OpenURL from Roderic Page on Vimeo.

Linked data part 2

Continuing the Friday folly theme, below is a screencast of a linked data browser that uses the same ideas as last week's screencast, but uses a custom browser I've written to display the results in a more user-friendly way.

Linking the data together from Roderic Page on Vimeo.

The demo is live, you can view it at http://iphylo.org/~rpage/browser/www/uri/http://bioguid.info/doi:10.1371/journal.pone.0001787. Under the hood the browser uses bioGUID as the primary linked data provider (although it should consume any valid linked data source, for example Dbpedia). The data is stored in a local triple store (ARC), and the web interface is created by transforming SPARQL queries into HTML using XSLT. You can add data to it by editing the URL in the browser location bar and reloading the page, or entering a URL on the page. Linked data URLs be entered next to the Browse button as is, e.g. http://dbpedia.org/resource/Euphausia, or appended to http://iphylo.org/~rpage/browser/www, e.g. http://http://iphylo.org/~rpage/browser/www/http://dbpedia.org/resource/Euphausi. Other identifiers, such as DOIs, PubMed ids, and specimens need to be resolved via bioGUID, e.g. http://iphylo.org/~rpage/browser/www/uri/http://bioguid.info/gi:86161637.

All still very crude, but I hope you get the idea.

iTaxon screencast

Sadly I won't be at TDWG 2009, at least not in person. However, there is a session on wikis, which may contain this brief screencast of my iTaxon experiments. The screencast was made in haste, but tries to convey some of the ideas behind these experiments, especially the idea that by linking data together we can generate more interesting and rich views of objects such as scientific publications. The screencast starts with the The amphibian tree of life page.