[mkgmap-dev] Test if POI is part of a line

Mon Oct 10 14:11:12 BST 2022

*mkgmap:line2poi=true & highway=* & mkgmap:from-node:barrier=gate [...]*

--- I will give this a try. Is this implemented in the main branch? I
thought this tag was related to patch poi-tagged-v3.patch
and never accepted.

I had not fully understood how it worked however. Will try this out and see
if it can work (then if it works, instead of higwhay=* insert the list of
conditions that delete a road)

On Mon, 10 Oct 2022 at 14:45, Gerd Petermann <
gpetermann_muenchen at hotmail.com> wrote:

> Hi Felix,
>
> please check the docu for special tag mkgmap:from-node:attname . I think
> this allows to filter a barrier node which on a highway.
> A rule in points like this should work with option --add-pois-to-line:
>
> mkgmap:line2poi=true & highway=* & mkgmap:from-node:barrier=gate [...]
>
> I didn't try it but this should only render the generated points from ways
> with highway=* and a tag barrier=gate on the node.
>
> Gerd
>
> ________________________________________
> Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag von
> Felix Hartmann <extremecarver at gmail.com>
> Gesendet: Montag, 10. Oktober 2022 11:47
> An: Development list for mkgmap
> Betreff: Re: [mkgmap-dev] Test if POI is part of a line
>
> Hi Gerd,
>
> No  --add-poi-to-lines creates points from a line that has certain tags.
> What I try to achieve is actually to remove points that are NOT part of a
> line / or  part of a line that is not rendered in the map. There is no
> reason to show a gate if you don't have a line/road.So essentially for me
> there is no sense to show a gate for me if it is not part of a routable
> line.
> However points created by add-pois-to-lines are also not what I want -
> because it would show the gate in an incorrect position.
>
> So the clutch of using --link-pois-to-ways  to get the access tags onto
> the line - then never show an actual barrier=gate/highway=gate but only
> show one created by the --add-poi-to-line command?  The logical solution is
> to really only show a gate where it is tagged, but only if the map is
> creating a routable line for it and remove all other barrier=* /
> highway=gate / entrance=yes POI.
>
>
> If this is too much work to implement - then drop it. But as far as I
> understand right now there is no good solution by mkgmap for this. The same
> would be for traffic lights - if you remove a road because your map does
> not show private roads - but a private road has a traffic light - this
> traffic light should not be in the map either. And yes I know the dilemma -
> we need points to be looked at pre lines for --link-pois-to-ways to work,
> but for some other things we would need to look at them later again. So
> this would need to be some kind of seond_finalize rules in the points file
> that is executed after the lines file - and removes points from the map
> again. It's not a big problem - but right now this really makes it
> inconvenient to put gates into your map - as 75% of gates are just
> cluttering up the map without providing any information to the user (except
> if you want to create a cataster type of map showing everything). Leaving
> gates out completely on the other hand makes it very ha
>  rd to show for example with parks where people can enter and where not.
> As very often there are service entries to parks not open to public - so
> these are the main ones that we want to show in a map.
>
> On Mon, 10 Oct 2022 at 08:35, Gerd Petermann <
> gpetermann_muenchen at hotmail.com<mailto:gpetermann_muenchen at hotmail.com>>
> wrote:
> Hi Felix,
>
> my first thought was that --add-poi-to-lines is all that you need, but
> maybe I've missed something?
>
> One problem with your suggested solution is that the current
> implementation in mkgmap processes
> (tagged) nodes before lines. I can't remember exactly why but a change
> probably causes side effects.
>
> Gerd
>
>
> ________________________________________
> Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk<mailto:
> mkgmap-dev-bounces at lists.mkgmap.org.uk>> im Auftrag von Felix Hartmann <
> extremecarver at gmail.com<mailto:extremecarver at gmail.com>>
> Gesendet: Freitag, 7. Oktober 2022 23:12
> An: Development list for mkgmap
> Betreff: [mkgmap-dev] Test if POI is part of a line
>
> I read through the old
> poi-tagged-v3.patch
>
> is_in()function for point on line discussion - but what I want is actually
> different and should be much easier?
>
> Could there be a solution to check if a point is a single point vs if it
> is part of a open/closed line?
> Why?
>
> I would only like to display barrier/highway=gate point icons if they are
> part of a (best routable) line. Especially for gates  most are just useless
> clutter because they are tagged on private houses and similar.
>
> If there was a way to delete afterwards/or create only in first place
> those points that are part of a line would be good, best would be if they
> are only shown if part of a routable line (so after the lines stye-file is
> processed).
>
> --
> Felix Hartman - Outdoormaps LTD - Openmtbmap.org & VeloMap.org
>
> _______________________________________________
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>
>
> --
> Felix Hartman - Outdoormaps LTD - Openmtbmap.org & VeloMap.org
>
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>

-- 
Felix Hartman - Outdoormaps LTD - Openmtbmap.org & VeloMap.org
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