[HOT] Mapping buildings

Jo winfixit at gmail.com
Thu Mar 23 01:17:47 UTC 2017


I created a document to help people coming to our National Mapathon
containing a fast introduction to JOSM:

https://docs.google.com/document/d/1VgTydfSsWGE0Bv34GrekHn8qPUW9CppR_1N66RoIDok/edit?usp=sharing

2017-03-21 22:37 GMT+01:00 Kretzer <kretzer at gmx.net>:

>
> I didn't know about the JOSM shortcut. Thanks, that's  very useful!
>
> Also Iove the idea of having a scaling tool in iD - would second that
> suggestion.
> On the other hand I don't have much practical use for the new mirroring
> tools. Maybe others have the same priorities?
>
>
>
> Am 20.03.17 um 08:29 schrieb Jo
>
> > In JOSM you can use the 'Improve way accuracy' tool (w) to conveniently
> > drag those corners followed by 'q' to square the building. That is
> somewhat
> > less time consuming than redrawing (and it keeps the history). A
> validator
> > can choose to either do this, or to invalidate the task. It's probably a
> > good idea to include a link to a video explaining how to fix the problem,
> > in case the square gets invalidated.
> >
> > Concerning the round buildings, it would be good to make mappers aware of
> > the possibility to use Ctrl-Alt-drag left mouse button to rescale after
> > using Ctrl-d. OK, that's also a JOSM thing. I think we should instruct
> > people to use JOSM for HOT mapping in the first place or finally
> implement
> > this kind of useful functionality in iD. Maybe there is still time to
> > propose it for GSoC? I won't propose it, as I'll only propose things
> that I
> > can mentor myself.
> >
> > Polyglot
> >
> > 2017-03-20 1:31 GMT+01:00 Daniel O'Connor <daniel.oconnor at gmail.com>:
> >
> > > I tend to use osmose to detect 'large building intersection clusters'
> at a
> > > very large scale - IE during the Nepal activation.
> > > Others that show up building-in-building or 'special building due to
> size
> > > marked building=yes' are also useful QA checks, often catching whole
> > > residential areas marked as a building for example.
> > >
> > > I think those may be the low hanging fruit of validation; and worth
> > > considering as a recommended check at the project level.
> > > Would be interesting to integrate those results into a 'validations'
> tab
> > > per tile or per project, keyed off of an osmose feed.
> > >
> > > Beyond that, its reasonably common to encourage 'squaring' the
> buildings -
> > > but I dont think you'd be able to push much further than that and get
> the
> > > majority doing it by default (would have to make it easier to one click
> > > improve the traced data somehow)
> > >
> > > On 20 Mar 2017 7:47 AM, "john whelan" <jwhelan0112 at gmail.com> wrote:
> > >
> > > We tend to think of mapping buildings as one of the simpler tasks we
> ask
> > > mappers to do but recently I've been looking at code that can extract
> > > buildings from OpenStreetMap aggregate the floor area then calculate an
> > > estimated population.
> > >
> > > Trouble is when I look at the map in some areas the buildings are
> > > accurately​ mapped but in others the standard of mapping leaves much
> to be
> > > desired.  Validation is a problem.  Do we expect validators to
> carefully
> > > move the four points to the correct corners and square them?  This is
> more
> > > effort than remapping them with the JOSM building_tool plugin and is
> > > unlikely to happen.  I also come a cross a large number of settlements
> > > tagged building=yes or building=residential these I correct as I come
> > > across them.
> > >
> > > Round huts are a particular problem, it's very easy to copy one hut
> which
> > > means they often end up being mapped the same standard size.
> > >
> > > Perhaps if we explain why it is important to map buildings accurately
> in
> > > the instructions we might get better results.
> > >
> > > Dunno, perhaps answer is not to estimate population based on floor
> area.
> > >
> > > Thoughts?
> > >
> > > Thanks John
> > >
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