[Talk-ca] Mapping Toronto's PATH entrances and ways to them

George Silva georger.silva at gmail.com
Tue Jun 2 14:53:17 UTC 2015


Hello Kevin and everyone!

This is great.

Kevin, I actually would like to help, whereever I can, mapping the
entrances and/or connecting these entrances to the street network.

What can I do to help?

On Sun, May 31, 2015 at 11:13 AM, Kevin Farrugia <kevinfarrugia at gmail.com>
wrote:

> Hey George,
>
> I'll work towards improving the way the connections are, but because of
> the large size of the network, the fact that it's invisible in imagery &
> GPS is useless, and I can only remember so much, it might take some time to
> make it perfect.  It's a bit of a wild west of connections down there and
> there can be many connections to the surface contained within one city
> block (8+ in some cases) with a mix of stairs, escalators, and elevators
> with varying levels of access based around the time of day.
>
> 1. Entrances are only mapped sometimes. Currently on OSM it seems that the
> underground PATH connects directly with the above ground network rather
> than having an elevator or stairway between the level change.  In the
> latest updates I've made I've added in escalators, elevators, and stairs
> and connected them to the PATH (level=-1) or the ground level network with
> an entrance node included on its intersection with the building.  One thing
> I've also noticed is that the PATH footways are marked using layer=-1, not
> level=-1 - I don't know if this makes a difference to OSRM.
>
> 2. I've been linking the entrances with indoor footways that connect to
> the PATH via elevators and escalators/stairs and then linking the other
> side of the entrance node to the sidewalks or roads so that it should be
> able to route between the two networks.
>
> If you have any suggestions or comments please tell us.
>
> Thanks for the heads up,
> Kevin (Kevo)
>
>
> -Kevin Farrugia
> kevinfarrugia at gmail.com
>
> On Thu, May 28, 2015 at 4:08 PM, George Silva <georger.silva at gmail.com>
> wrote:
>
>> Hello Everyone! Good afternoon!
>>
>> I'm working on a project that uses OpenStreetMap to do some routing. I'm
>> using the OSRM router as a service.
>>
>> We identified a problem with the routing, and the problem does not lie in
>> the router itself. Some routes we try to execute in our software, go
>> underground, into the PATH tunnels. When I try to route between two points
>> inside the PATH, all goes well and the router does it's job just fine.
>>
>> When I'm above ground and try a route that goes underground a few things
>> can happen:
>>
>> 1. OSRM gives me the car route and then traces a direct line to the point;
>> 2. OSRM routes using the PATH;
>>
>> The second only happens when the PATH is connected to the street graph.
>>
>> So, we will be applying a two step routing, to the entrances of the PATH,
>> and from there, to the underground locations, when necessary. When it's
>> above ground > above ground, we'll just use a simple routing scheme.
>>
>> My questions are:
>>
>> 1. How are the entrances mapped? Is there any specific tag on OSM that
>> marks them as entrances or that the level is changing (from 0 to -1, for
>> example)?
>>
>> 2. All of these entrances should be connected to the main graph,
>> otherwise they are unreachable from a street or a sidewalk. How can those
>> be mapped?
>>
>> I'm sorry about the lengthy email, but I want to contribute and I do not
>> want to step on any toes.
>>
>> Thanks
>>
>> --
>> George R. C. Silva
>> Sigma Geosistemas LTDA
>> ----------------------------
>> http://www.sigmageosistemas.com.br/
>>
>> _______________________________________________
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>> Talk-ca at openstreetmap.org
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>>
>>
>


-- 
George R. C. Silva
Sigma Geosistemas LTDA
----------------------------
http://www.sigmageosistemas.com.br/
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