[Imports] Updates:LA County building import (Los Angeles, California, USA)
chris_hormann at gmx.de
Tue Jul 19 14:44:07 UTC 2016
On Tuesday 19 July 2016, maning sambale wrote:
> Another round of updates on LABuildings import.
> Last week we've imported ~1.1M buildings in LA City. Over 100
> usernames participated.
> We are close to finishing Phase 1 (LA City) and will continue data QA
> and cleanup if needed.
A few observations from looking over the map there:
* There are quite a few cases where gaps between buildings are either
very small (significantly less than a meter) or buildings touch at a
single node. Both are usually artefacts (probably primarily due to
roof based rather than footprint based outlines).
* There seem to be a lot of cases where garages and sheds are tagged as
building=house or building=residential - like here:
* In some cases boundaries of pre-existing landuse polygons (like
landuse=residential/landuse=industrial) and roads now intersect
buildings indicating that mapping is inaccurate - like here:
All of these problems could probably be turned into maproulette tasks or
be otherwise worked into QA tools - although at least the first two
will require on-the-ground assessment for proper correction.
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