[Talk-se] Mapbox Organized Editing

Fri Mar 21 06:54:15 UTC 2025

Mapping with nvdb is mostly the best armchair mapping, but I agree with
Zvenzzon. Would go so far as to say if you replace geometry with nvdb it is
hard to be responsible.

I use it for correcting ortoerrors.

Troger is the DEM available as a tile source now?

/emj

Den tors 20 mars 2025 22:01Anders Torger via Talk-se <
talk-se at openstreetmap.org> skrev:

> While there quality in NVDB does vary (it's a collection of multiple
> sources) and geometry simplifications does occur, it's on average very
> good. You cannot get the same accuracy from Bing or ESRI imagery, if you
> want to get similar precision from ortophoto you would need lantmäteriet's
> own. Sure if you have your own diff-GPS system you can get more precise,
> but most maps from some sort of orthophoto, usually with limited elevation
> correction leading to fairly large positional errors.
>
> Ideally you should use NVDB + Orthophoto + strava heatmap for sanity
> checking + local knowledge where available. I've mapped tens of thousands
> of roads in this manner in northern Sweden and quality of NVDB is very
> good, while roads mapped on (especially older) ortophoto in hilly regions
> can be very far off the mark. In city geometry stuff get a bit more
> complicated, because there may be simplifications made for navigation which
> may not match with OSM tradition, and there you need to deviate at times.
> We have an ongoing manual import project with documentation of limitations
> and caveats. You should never import blindly, that's why the NVDB import
> project (or rather manual merging) takes such long time. If you see errors
> like duplicated geometries, clearly the mapper hasn't paid much attention
> to his or her merging effort. Any source if misused leads to poor results.
>
> It's best to use multiple sources and if working in Sweden NVDB should for
> sure be one of them, and if the only positional data you have is NVDB and
> an ortophoto from Bing or Esri, NVDB is nearly always better positioned,
> with the exception of geometry simplification possibly occurring on
> multi-lane roads, or sometimes very new forestry roads with preliminary
> geometry and other rare exceptions. Naming of forestry roads can be wonky
> in places, as the reporting can be patchy and approximate depending on
> forestry company responsible for the reporting. Naming of roads in cities
> are usually of very high quality.
>
> The problem with OSM in Sweden is that the coverage can be patchy in
> places where there are few active mappers, and some mapping can be rather
> outdated. The big cities are usually well covered, or home cities of super
> mappers. There are large areas in Sweden which is only occasionally paid
> attention to, and there mapping work from people without access to the
> ground is needed, and in such a situation using NVDB in a responsible way
> as one of the key sources is the best way to go.
>
> However, if the mapper doesn't really want to make the effort to use NVDB
> responsibly and not knowing about its limitations or how you relate to
> existing mapping, it's best to not use it of course.
>
> /Anders
>
> On 2025-03-20 13:07, Peter Svensson wrote:
>
> I disagree. The only things that shows exact locations of Swedish roads
> are the ground itself. Everything else is approximations and
> simplifications which are by definition "not exact". I've lost count of how
> many things I've cleaned up after various NVDB import efforts, such as
> incorrect names and duplicated/questionable geometries.
>
> I encourage use of other sources than NVDB for mapping missing roads.
>
> With regards,
>
> zvenzzon
>
>
>
> Den tors 20 mars 2025 12:31Markku Siipola via Talk-se <
> talk-se at openstreetmap.org> skrev:
>
> Your answers shows you are not aware of NDBD, the National road database.
> This source should always be used, and not any source. The NVDB shows the
> exact locations of Swedish roads. It's waste of time of not using this db.
>
>
>
>
>
> Den 2025-03-20 kl. 08:38, skrev Valeria Yukovich via Talk-se:
>
> Hello, Snusmumriken! Thank you for the questions.
> We will be using available sources which are appropriate for mapping on
> OSM (satellite and street-level imagery, for example). Besides that, we
> will be also using Mapbox telemetry data and GPS traces in cases when
> there is limited evidence. More information about Mapbox telemetry data can
> be found here: https://www.mapbox.com/telemetry.
> Speaking about our experience with other countries, we mostly encountered
> missing roads in newly built residential areas and around commercial
> objects, which we did not map in cases if the evidence (street-level
> imagery or up-to-date satellites, information from the telemetry) was not
> enough for mapping.
>
> On Wed, Mar 19, 2025 at 12:18 PM Snusmumriken <
> snusmumriken.mapper at runbox.com> wrote:
>
> On Tue, 2025-03-18 at 16:46 +0300, Valeria Yukovich via Talk-se wrote:
> > Hello from the Mapbox team!
> >
> > Our team has been mapping missing roads since May (as described
> > here: https://community.openstreetmap.org/t/mapbox-organized-editing-
> > missing-roads/113678) and currently we are preparing to expand the
> > effort to Sweden.
>
> Hi
>
> I have basically two questions:
> - What sources will you be using in Sweden?
> - What are the most common problems you've encountered in other
> countries?
>
>
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