[Imports] [Talk-us] Import WestCOG building footprints in south-west Connecticut

[Martin Machyna]

So to update this thread, I have integrated addresses from CT Open Data
dataset and also updated the wiki page (
https://wiki.openstreetmap.org/wiki/Connecticut/Western_COG_Building_Import)

The whole dataset can be looked at:
https://drive.google.com/file/d/10hUl09WSmK-I8h1hkMlELIGwDYsEziSe/view?usp=sharing
For quick loading I also made a subset for one town (Westport):
https://drive.google.com/file/d/1oMSbHXpPY5eLSHhGlikGy2uudyq3VyoV/view?usp=sharing

If there is any issue, please let us know.

On the side note of the CT Open Data buildings suitability for import I
found a way how to simplify all buildings in an automated way in python.
Here is a quick comparison of before/after
https://files.slack.com/files-pri/T029HV94T-F01AD0FNFD3/simplified.png (you
need to have Slack account)
It doesn't look so bad and we could consider it for a next round of import.

Just for a future reference in case someone would need to do the same, the
python code is:

import geopandas as gpd
import pandas as pd
from shapely import speedups
speedups.enable()

address =
gpd.read_file("Connecticut_Buildings_with_Addresses_experimental.shp")
simple = address.simplify(0.000005, preserve_topology=True)
simple.to_file('Buildings-simplified.geojson', driver='GeoJSON')



On Sat, Aug 29, 2020 at 6:50 PM <joe.sapletal at charter.net> wrote:

> I was going to look at the buildings too.  I’ve used a tool in ArcGIS to
> correct some pretty awful buildings, but I couldn’t download them either.
>   If there is no hurry, I’d check in again with the contact on Monday.  It
> would be nice to have the buildings with addresses on them.
>
>
>
> Joe
>
>
>
> *From:* Yury Yatsynovich <yury.yatsynovich at gmail.com>
> *Sent:* Saturday, August 29, 2020 5:05 PM
> *To:* Julien Lepiller <osm at lepiller.eu>
> *Cc:* imports at openstreetmap.org; talk-us at openstreetmap.org
> *Subject:* Re: [Talk-us] [Imports] Import WestCOG building footprints in
> south-west Connecticut
>
>
>
> Hi Julien,
>
> Unfortunately, I have limited knowledge on the data quality as I wasn't
> able to download it (the server returns error). I let the CT point of
> contact (Scott) know about the problem -- he mentioned in our communication
> that he forwarded the issue to the tech support team, but I haven't heard
> from them since then and I'm still unable to download it.
>
>
>
> On Sat, Aug 29, 2020, 4:57 PM Julien Lepiller <osm at lepiller.eu> wrote:
>
> So, it's been a week since that last message. Do you think we should
> import addresses and buildings at the same time? Should we import the
> buildings first and care about addresses later?
>
> Yury, what are your thoughts about the data source quality? Do you
> think it's a good idea to import from WestCOG and maybe rely on CT data
> for the rest of CT? I tried playing with the data and I didn't see any
> difference between drawing the buildings from scratch and having to
> simplify and correct CT's data.
>
> Thanks!
>
> Le Sat, 22 Aug 2020 19:36:23 -0400,
> Martin Machyna <machyna at gmail.com> a écrit :
>
> > Thank Julien for pushing this forward!
> >
> > yeah, I tried to get addresses from here:
> >
> http://geodata-ctmaps.opendata.arcgis.com/datasets/bfa7da83da384c2aa809882179369dc4_0/features/305004
> > and add them on top of the westCOG buildings.
> >
> > The data is a big mess because it's a join_table of like 30 different
> > address databases. I lost a bit of motivation there, but I could have
> > a look at it again.
> >
> > Martin
> >
> > On Sat, Aug 22, 2020 at 2:19 PM Julien Lepiller <osm at lepiller.eu>
> > wrote:
> >
> > > Le Sat, 22 Aug 2020 13:30:02 -0400,
> > > Yury Yatsynovich <yury.yatsynovich at gmail.com> a écrit :
> > >
> > > > Hi Julien,
> > > > The following communication that I've had recently with a CT
> > > > official might be of interest to you:
> > > >
> > > >
> > >
> > > Oh, great! I think we already saw this data (I tried to contact them
> > > too, but never got a reply :/). From what we saw (I think it was in
> > > February?) the footprints have simplification issues (see
> > > https://files.slack.com/files-pri/T029HV94T-FTDGDHXTM/image.png for
> > > instance) where they are too detailed, not square enough, etc. Some
> > > buildings also have holes in them, when there's none in the imagery.
> > >
> > > So I think it's too bad to be used directly, without a lot of manual
> > > effort to simplify, square and redraw the shapes. However, the
> > > address data is very interesting, so maybe we could extract from
> > > it? Or we could use a separate dataset if they have addresses
> > > separately.
> > >
> > > _______________________________________________
> > > Imports mailing list
> > > Imports at openstreetmap.org
> > > https://lists.openstreetmap.org/listinfo/imports
> > >
>
>
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