Tagging Extended
Danny Ayers blogged about the Triple Tag, a good extension of the... Single(?) tag.
The form of such a tag:
[namespace]:[key]=[value]
Which, in terms of geocoding would look a little something like this:
geotagged
geo:lat=53.1234
geo:long=-2.5678
Simple, short, sweet. The examples Danny gave are from a project called MobiLife, which looks pretty interesting.
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If you're interested in playing with the Flickr geotagged dataset, I've had a cron job accumulating them in a SQLite database, which you can download here: http://phiffer.org/maps/flickr.db. Be warned, it's a big file (~28MB). It'll let you do stuff like request the tags that fall in some range of lat/lon. Or you can just see what they look like on a map here: http://phiffer.org/maps/.
Some web apps, such as upcoming.org, don't support the colon tag syntax. Tags sometimes get stripped of non-alphanumerics (colons, periods and dashes), rendering the whole geotagging thing kind of impotent. But in the case of upcoming.org, each event inherently has its geographical location embedded in the address of the venue.
For this reason I think the colon syntax (see also del.icio.us's for:username, system:filetype, etc.) have limited usefulness compared to the ordinary kind of tags. Some type of information should be given its due attention, such as the date of modification, the author, etc. Overloading the meaning of tags requires users to relearn a different system for each application.
Of course as an end-user you don't get much say in what "officially supported" metadata you can enter. If lat/lon metadata isn't baked into the application and tags aren't supporting a colon type syntax, I guess that kind of leaves you in the dark. The solution, I think, lies in 3rd party annotation. Mushon and I are working on something along those lines and I think it'll be interesting. Like del.icio.us, but bigger.
hey you,
you didnt tell me about merkitys. i wonder which finnish cat came up with this one :P