[Imports] RFC for Denver Planimetrics Buildings Import

Denis Carriere carriere.denis at gmail.com
Tue Oct 3 01:52:20 UTC 2017


Hey Russell,

To start off, great import wiki! +1 on my vote

Just wanted to comment on the spatial joins you are performing, we
experienced the same pitfall when conducting Ottawa's OSM building import.

> To achieve a match, two spatial joins were performed with the OIT address
points and roofprint polygons.  First using “point falling inside polygon”,
then using “closest point” for the remaining records.

1. *Address fall inside polygon* (Should be a match)
2. *"Closest point"* - Normally the closest polygon doesn't mean that's the
main building, it could actually be a shed or a garage depending on how
accurate the address point is.

*How we solved that issue:*

1. Using parcel data (seems like you have access to that type of dataset)
find all the buildings which are contained inside that parcel.
2. Exclude sheds & garages (sqft 240 or less)
3. Find the largest area building (typically the main building).
4. If more than 3 buildings in the same parcel, ignore matching since this
would be typically a farm land and it would be impossible to automatically
match the address point with multiple building footprints.

Best of luck with the import!

*~~~~~~*
*@DenisCarriere*
*GIS Software & Systems Specialist*

On Mon, Oct 2, 2017 at 8:17 PM, Russell Deffner <russdeffner at gmail.com>
wrote:

> Greetings everyone,
>
>
>
> After a long discussion and planning period locally, we are pleased to
> announce the plan for importing Buildings in the Denver metro of Colorado,
> United States.
>
>
>
> The import wiki is here: http://wiki.openstreetmap.org/
> wiki/Denver_Planimetrics_Import
>
>
>
> A few notes:
>
> * As you can see in the schedule on the wiki-page, this has been under
> discussion with the local community since the beginning of the year.  We
> hope that all questions and concerns have been raised and addressed either
> on the talk-us and imports-us mailing lists and/or one of our many meetups.
>
> * We’re working on a nicer workflow document coming soon.
>
> * We’re working on getting the processed data hosted for review, also
> coming very soon.
>
>
>
> Please use the discussion tab on the wiki-page or a reply to imports@ so
> the entire team can follow, although you’re welcome to contact me directly
> as well;
>
>
>
> Look forward to your comments,
>
> =Russ
>
>
>
> Russell Deffner
>
> russdeffner at gmail.com
>
> *https://www.meetup.com/OSM-Colorado <https://www.meetup.com/OSM-Colorado>
> *
>
> _______________________________________________
> Imports mailing list
> Imports at openstreetmap.org
> https://lists.openstreetmap.org/listinfo/imports
>
>
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