[OSM-talk] Visually detect missing roads

[Sylvain Maillard]

Hi,

I look at your map for Lyon, and don't understand most of the "missing
road" that your tool is showing ...
an example with
http://compare.osm-tools.org/?zoom=15&lat=45.73417&lon=4.82971&layers=BT00F
: the road is there in both maps and seems to have the same kind of
attributes (oneway and classification). Can you explain why there is a big
red mark on it ?

cheers,
Sylvain



2014-09-15 10:53 GMT+02:00 SomeoneElse <lists at mail.atownsend.org.uk>:

> On 15/09/2014 08:53, Stephan Knauss wrote:
>
>>
>> So actually a map with no diff is good. At least a good indication that
>> the map is not missing something important. Assuming for a moment that
>> Google data is a perfect reference (which is not as we all know).
>>
>
> Unfortunately, "we" (as in all OSM users using QA sites) don't all know
> this.  That's why I made the comment up the thread about Google (and
> actually also Apple) Maps showing a road locally to me that doesn't exist.
>
> There's an increasing problem with relatively inexperienced users*
> thinking that if a QA site no longer shows a problem, then the problem is
> "fixed", and here it's compounded by saying "a perfect map is grey".  In
> reality of course you'd need to go there and have a look to make sure.  Of
> course, sometimes you can't do that (the area's physically inaccessible, or
> far away and there are no local mappers available to fix a problem) and in
> those cases QA sites such as yours can be extremely useful.
>
> Other QA sites tend to make it clear what they're actually showing (e.g.
> "musical chairs" has in capital letters at the bottom of the screen "THIS
> IS A LIST OF DISAGREEMENTS, NOT NECESSARILY OSM ERRORS".  Clearly some sort
> of disclaimer text like that would make sense, but would it perhaps also be
> possible to guide new mappers towards other fixing options available, such
> as:
>
> o find a local mapper and contact them - even just to ask if (a) is
> correct and then (b), and then do the edit based on that.
>
> o where there are no local active mappers add a note that someone can see
> when they're next in the area requesting a survey.
>
> Cheers,
>
> Andy
>
> * actually, it's not just relatively inexperienced mappers. Recently in
> the UK we had someone inventing footpaths to join (arguably mistagged)
> highway=pedestrian islands to nearby roads. Just this morning we've had
> someone decided that the actual metal signs describing a road are clearly
> wrong when compared to what Ordnance Survey's open data says.
>
>
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