[HOT] Mapping buildings

Jo winfixit at gmail.com
Mon Mar 20 07:29:15 UTC 2017


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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