[Imports] Proposal for importing building footprints for Onondaga County, NY

[Jack Arnold]

I've updated the wiki page to reflect those changeset tags, thank you
for pointing that out. 

Just finished reviewing the data quality of this sample. There are
about 1200 building footprints present. Buildings I'm familiar with
represent the ground situation, and there are no glaring
inconsistencies. Checking against satellite imagery (Bing as of 2021),
all footprints are over buildings and in good alignment (not rotated).
Larger buildings have about a 1-2 foot offset, as well as most smaller
houses. There are portions where houses have between 3-5 foot offset,
appearing under tree cover. Against Google and ESRI Imagery World
satellite all buildings are offset ~15 feet southeast.

I also found 12 buildings which will need to be manually updated for
what appear to be additions. No footprints appear to have more than 10
vertices in their polygons, except those with rounded corners. The JOSM
validator found no errors. Can't confirm that all "sheds" in the
backyards of homes exist. Perhaps they should be considered temporary
buildings and filtered out to prevent clutter. 

I have a script comparing the centroid coordinates for individual
buildings appearing in both OpenStreetMap and the prepared file for the
whole county. When selecting buildings whose area was less than 5%
different, there was a 4 foot difference on average. I will refine this
script and put it in the repository later.

Does this sample file meet the quality required for import in
OpenStreetMap? 

Jack

On Thu, 2021-02-04 at 18:44 +0100, Mateusz Konieczny via Imports wrote:
> Yes, that seems fine to me.
> 
> And for initial edits made by bot process and still fully reviewed
> bot=yes is not so necessary.
> 
> The most important part is including documentation page so
> for example 5 years later someone will be able to easily confirm
> that it is a legitimate import - and find full detail.
> 
> BTW, have you reviewed data quality on same sample?
> Is it matching on the ground situation or at least aerials?
> 
> Looking at
> https://gitlab.com/jackarnold/onondaga-building-osm-import/-/blob/master/prepare.py#L56
> Is in area of import something like demolished:building=yes?
> Or maybe someone used other
> https://wiki.openstreetmap.org/wiki/Lifecycle_prefix ?
> https://wiki.openstreetmap.org/wiki/Tag:man_made%3Dstorage_tank 
> appearing in dataset as a building?
> 
> Is dataset including fully underground features (location=undeground,
> maybe also layer tag needed)?
> 
> Feb 4, 2021, 18:11 by imports at openstreetmap.org:
> > I plan on starting by manually reviewing and uploading changesets,
> > so I
> > didn't feel pointing out it was automated necessary. It was poorly
> > phrased. Would this be appropriate for changeset tags?
> > 
> > comment=Onondaga County, NY building footprints import
> > https://wiki.openstreetmap.org/wiki/Import/Catalogue/Onondaga_County_NY_Building_Footprint_Import
> > bot=yes
> > source=http://www.fsihost.com/onondaga/
> > source:date=2020-10-01
> > 
> > On Thu, 2021-02-04 at 11:56 +0100, Mateusz Konieczny via Imports
> > wrote:
> > > "Changeset tags won't be necessary until the import is automated
> > > and
> > > not manually reviewed."
> > > 
> > > https://wiki.openstreetmap.org/wiki/Import/Catalogue/Onondaga_County_NY_Building_Footprint_Import
> > > 
> > > What you mean by that?
> > > Changeset tags should at least link wiki documentation page and
> > > mark it as a bot edit (though wiki documentation page may be also
> > > linked in
> > > the changeset comment).
> > > 
> > > Feb 4, 2021, 01:55 by imports at openstreetmap.org:
> > > > Hello,
> > > > 
> > > > I previously discussed importing building footprints for
> > > > Onondaga
> > > > County, NY from data provided by the Syracuse-Onondaga County
> > > > Planning
> > > > Agency. The data source was prepared for the county by
> > > > “Pictometry
> > > > International using digital orthogonal
> > > > aerial photography flown by Pictometry”. The data have been
> > > > updated
> > > > as
> > > > recently as October 2020 and not since, after checking with
> > > > SOCPA.
> > > > It
> > > > is accurate to between 2 and 5 feet when compared against Bing
> > > > Imagery
> > > > or ESRI World Imagery. SOCPA has given OpenStreetMap a waiver
> > > > to
> > > > use
> > > > this data, which has been verified by the legal team on their
> > > > mailing
> > > > list.
> > > > 
> > > > Recently I’ve been working on formalizing the conversion script
> > > > and
> > > > wiki page, which is available here:
> > > > 
> > > > https://wiki.openstreetmap.org/wiki/Import/Catalogue/Onondaga_County_NY_Building_Footprint_Import
> > > > 
> > > > To allow the community to review the import at this state, I
> > > > have
> > > > created a shapefile from converted data for the Village of
> > > > Liverpool,
> > > > NY:
> > > > 
> > > > https://gitlab.com/jackarnold/onondaga-building-osm-import-example/-/raw/master/20210203/28_Village%20of%20Liverpool.geojson
> > > > 
> > > > I hope that there will be no issues with the data, and minimal
> > > > tweaking
> > > > to be required to move forward with the import. From here I
> > > > will
> > > > manually verify the data against satellite imagery, then upload
> > > > the
> > > > OSM
> > > > file to the test server, and verify it once again. With
> > > > approval
> > > > from
> > > > the community, I will continue to import one
> > > > municipality/town/or
> > > > smaller boundary at a time on the main server, and update the
> > > > wiki
> > > > page
> > > > with my progress.
> > > > 
> > > > I would appreciate and comments, suggestions, or concerns!
> > > > 
> > > > Thanks,
> > > > Jack
> > > > 
> > > > 
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> > > > Imports at openstreetmap.org
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