[Tagging] RENDER

[Marc Gemis]

With overpass you can find all objects that have certain tags, e.g.
http://overpass-turbo.eu/s/4F2 finds all administrative boundaries without
wikidata tag.
By default Overpass Turbo renders those areas in yellow with a blue border.

I have not experimented with overpass + mapcss, but
http://wiki.openstreetmap.org/wiki/Overpass_turbo/MapCSS should give an
idea of the possibilities.
When the UI of Overpass Turbo would be adapted I can imaging that everybody
can write a query that retrieves the needed objects and color them in any
way they want.

Of course it is not integrated into the main map, but might help people
that are mapping rare or items that are not rendered by the default mapnik
to see their data come alive.

I used it for heritage=4 objects, missing lane tags, missing postal code
boundaries and now for missing wikidata tags. None of those tags are
"quickly" available on the maps I know. E.g. I don't want to wait 3-4 days
before ITO updates their missing lane map.
But I always use the "standard" Overpass rendering.

One might define a library (a webpage with a lot of links) of those
overpass queries where people can click on and see e.g.  whether the
miniature golf (of whatever) they want, was added to the database.



IMHO the problems that some people have with your approach is that you
might write:

*l*anduse=boat_storage  sport=kayak   render=darkblue

and I will write

landuse=boat_storage  sport=kayak   render=green for another instance
and
leisure=miniature_golf   render=darkblue

so is darkblue a boat_storage or a miniature golf ?
so in the end, the same thing might be rendered in different colours all
over the world and you would never recognize all the kayak boat storages by
looking at the colour.

when you have control over the complete rendering (as in my proposal), you
define the colour for boat_storage, all over the world. This is some poor
mans version of defining a complete mapcss for mapnik

regards

m


On Wed, Aug 20, 2014 at 2:33 PM, André Pirard <A.Pirard.Papou at gmail.com>
wrote:

>  On 2014-08-15 16:12, André Pirard wrote :
>
> Hi,
>
> It's a well known fact that many people complain to tag in vain because
> what they tag doesn't show on the map (e.g. mini-golf vs tennis pitch),
> because they're told to open a rendering ticket which replies that only
> official tags are supported, and because they open a vote for an official
> tag and nobody signs.
> As a result they are accused of "tagging for the renderer" instead of
> "being forced to tag for the renderer".
>
> The solution is simple however.  A RENDER tag that, typically, would
> assign a color to an area.
> I'll let the rendering specialists define what else it can do.
> ⚠ ⚠ ⚠ RENDER only requests *by default* rendering.
> As soon as rendering is defined for an element, it is used instead and
> RENDER is normally ignored.
>
> I summarize the answers below.
> An example for using RENDER is this:
>
> * landuse=recreation_ground* a sort of holiday/family event site inside
> which you have
> a quite visible   *leisure=pitch  sport=tennis*
> and two perfectly invisible polygon features (official tags or so), hence
> to which we add RENDER:
> *leisure=miniature_golf*   render=coral
> *landuse=boat_storage  sport=kayak*   render=darkblue
>
> As usual, every other reply I received disparaged this suggestion without
> proposing the slightest alternative, for example only force drawing the
> outline without color (that would do if a name can be inside).
>
> Hence, the general consensus is either to tag for the renderer or not to
> tag such touristic POIs at all.
> It's strange to have to campaign for tagging !!!
>
> Except Marc who suggests:
> On 2014-08-15 18:58, Marc Gemis wrote :
>
> maybe it should be even easier for people to play with overpass turbo and
> css. then you get the same effect
>
> Interesting, Marc.
> Could you please elaborate, explain how to use overpass and css and show
> the resulting tagging for example for the above case?
>
>   André.
>
>
> _______________________________________________
> Tagging mailing list
> Tagging at openstreetmap.org
> https://lists.openstreetmap.org/listinfo/tagging
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.openstreetmap.org/pipermail/tagging/attachments/20140820/89a092b5/attachment.html>