[Imports-us] NYC Import Review

Alex Barth alex at mapbox.com
Fri Dec 13 06:48:21 UTC 2013


Hey Ian -

Thanks so much for diving in and doing a thorough a review. I'll dig into
Github tickets in the next week. I've been side tracked with other work
this week.



On Mon, Dec 9, 2013 at 5:15 PM, Ian Dees <ian.dees at gmail.com> wrote:

> 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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