Hi all, I carved some time today out to review some of the New York City building import that have gone in so far. Over the course of 3 hours or so I reviewed 17 areas. I picked tasks from around the city in an attempt to cover as much of any variation in time and space that these imports occurred.
In general, the quality of the dataset is very very good for the amount of data it contains. The buildings are squared up, very rarely overlap (there was one case of a triangle polygon sitting in the middle of a house), and the vast majority of nodes that overlap with the edge of a building are joined with the neighboring way [0]. With the exception of changesets uploaded early in October [1] the address nodes are merged with the buildings when there's a single address for that building. I spot checked some addresses against Bing and Google geocoding and they match up as expected. Going forward, I see a bunch of work in checking to make sure that the changesets uploaded in October are fixed (mostly address merging to be consistent with the rest of the buildings and name expansion in the addr:street tag), but the changesets uploaded in December look to be very good. The addr:street expansion and address merge problems were solved. There were some cases where it was obvious that the source data from New York City was suspect (almost exclusively multiple address points inside a building where one was for a different road), so hopefully we can point those out to NYC and have them fixed. The notes I took along the way are here: https://hackpad.com/New-York-City-Buildings-Review-AkvL8ouj5EE I will be filing tickets for all the individual issues I ran in to on github: https://github.com/osmlab/nycbuildings/issues/created_by/iandees?state=open Thanks for reading the "summary" of my afternoon :) -Ian [0] There were a dozen or so cases of buildings where there was one node that was not joined properly. These were in changesets uploaded early in the process. The JOSM validator spotted them and I manually fixed them. [1] These should probably be automatically corrected if possible as it's time consuming to do manually (although some of the changesets were manually fixed by the uploaders after the decision to merge with buildings was made)
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