Yahoo's geography APIs

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l've been enjoying playing with GeoPlanet, a free RESTful geography data API provided by Yahoo's Geo Technologies group. GeoPlanet issues WOEIDs ("Where on Earth IDs"), unique identifiers for place, ranging from plazas, up to to neighborhoods, districts, cities, counties, states, and nations. WOEIDs are intelligently linked up, so you can programmatically navigate between parent, child, and adjoining places. It deals well with ambiguity, and it's really nicely internationalized, both in terms of input and output. You can feed it free text (e.g. "Berkeley, California") and get back a ranked series of best-matches, along with latitude/longitude, bounding box, parent areas, and human-readable names.

There's a great interview with one of GeoPlanet's developers at O'Reilly Radar:

"[U]sually...geography is handled as a purely spatial problem. What I mean by that is that things are handled in longitude and latitudes. And traditionally, if you have a place such as a city or town which is polygonal on the map, it's usually boiled down to a centroid, which again is a coordinate pair. And then all of the questions relate to the coordinate pair...instead of taking a spatially-based approach to location, we take a place-based approach...It could be a park. It could be a region like the Pacific Northwest. It could be a continent and even the earth is a named place....we take all of these different names places and all of these different granularities and we give them unique identifiers called Where On Earth ids or WOE ids for short...

So coming back to the point about really open location, one of the goals that we want here is that we want to be able to ensure that we can all...refer unambiguously to the same place no matter how it's called. So the United States is the United States or it's USA. Or it's Les Etats Unis. All of the different labels are assigned with the same Where On Earth identifier. And it's really exposing that identifier out is we think the prime benefit...We won't tell you everything about them or their census statistics or the population. It's really, "Here's the identifier. This is where it can be found. And this is how this identifier relates to other identifiers." (more...)

Yahoo's work around developing interesting open platforms is totally underhyped. I'm ready to consider locking myself into Yahoo's WOEID system in my own apps; it's rich and open enough for my needs.

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