[HOT] Comment to project managers of Building projects

Bjoern Hassler bjohas+mw at gmail.com
Wed Dec 27 22:23:44 UTC 2017

Hi John,

Thanks for this suggestion.

Would it be an idea to enhance the mapathon instructions, to include
suggestions such as running scripts like these (at the validation stage, or
perhaps run by the task owner)?

If anybody wants to get together to discuss those planning/ best
practice-related issues, I'd be very happy to  join in!


On Wed, 27 Dec 2017 at 19:12, john whelan <jwhelan0112 at gmail.com> wrote:

> A snapshot of 10% of Uganda gave me 870 duplicate buildings. This is where
> two buildings overlap by more than 50%. This is merely to give you an idea
> of the scope of the problem.
> If you are relying on the data then running Mike Thompson's detect
> building script will find any duplicates in your project.
> Typically I'm seeing clusters of up to 200 duplicate buildings in a small
> area, that one was on a project to count buildings for a solar panels.
> These are not uploaded twice but the buildings have been mapped twice with
> small differences.
> https://github.com/MikeTho16/JOSM-Scripts
> Select Duplicate Buildings
> Selects duplicate, or near duplicate, area buildings in JOSM's active
> datalayer.
> A "near duplicate" is a building whose area overlaps another building's
> area by more than 50%. Only the first building encountered of an
> overlapping pair is selected. This is done so the issue does not have to
> be
> looked at twice. The selected buildings are added to the current
> selection.
> Currently only works with buildings that are ways (not multipolygons).
> To Run:
> * Install JOSM's Scripting Plugin (only necessary once)
> * Place file in a convenient location on your system (only necessary once)
> * Click "Scripting" (on top menu bar)
> * Click "Run"
> * Click "..." button and select the script file.
> * Click "Run"
> If you decide to delete some I'd recommend downloading the area fresh in
> JOSM then running the script, inspect each building deleting if need be
> then upload the results quickly to reduce the risk of a another mapper
> deleting the other building of a pair.
> Cheerio John
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