[HOT] Mapping buildings

[Kretzer]

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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