Posts Tagged ‘ugc’

Exploring Place through User-generated Content: Using Flickr to Describe City Cores (Spatial Info Sci)

Monday, August 9th, 2010

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[Editor's note: Good focus on vernacular geography, on how we name and describe space, with a particular focus on downtown city cores explored thru millions of photos on Flickr. "Importantly, it deals with regions which are typically not represented in formal administrative gazetteers and which are often considered to be vague." Never seen Flickr geography before? Check out Aaron's flickr shapetiles (map), shpfile browser, and geotagger world atlas.]

Republished from the Journal of Spatial Information Science.
By Livia Hollenstein and Ross Purves

Terms used to describe city centers, such as Downtown, are key concepts in everyday or vernacular language. Here, we explore such language by harvesting georeferenced and tagged metadata associated with 8 million Flickr images and thus consider how large numbers of people name city core areas. The nature of errors and imprecision in tagging and georeferencing are quantified, and automatically generated precision measures appear to mirror errors in the positioning of images. Users seek to ascribe appropriate semantics to images, though bulk-uploading and bulk-tagging may introduce bias. Between 0.5–2% of tags associated with georeferenced images analyzed describe city core areas generically, while 70% of all georeferenced images analyzed include specific place name tags, with place names at the granularity of city names being by far the most common. Using Flickr metadata, it is possible not only to describe the use of the term Downtown across the USA, but also to explore the borders of city center neighborhoods at the level of individual cities, whilst accounting for bias by the use of tag profiles.

Continue reading via their PDF . . .

Map: Where has Obama been in Washington? Where do you want him to go? (Wash Post)

Tuesday, July 21st, 2009

[Editor's note: This interactive Google mashup builds off some code I programmed last year. I still like how the map snaps back to the original position after the info window closes. Kudos to Gene Thorp!]

Republished from The Washington Post.
Related articles:

According to whom you ask, President Obama has either embraced the D.C. area more than any other recent president or is falling well short of the full Washingtonian-status they had hoped the city-loving First Family might embrace. This map highlights most of the president’s stops in and around Washington to date, as well as some suggestions for the Obamas’ future dining from Post restaurant critic Tom Sietsema. Click on an icon to learn more about the president’s visit or Sietsema’s recommendation. And please use the comments box to suggest eateries, date-night venues, cultural events and other local outings for the president. We’ll add the most promising recommendations to the map on Monday.

Screenshot below. Interact with the original at The Washington Post . . .

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