[OSRM-talk] Exclude bridge from OSRM calculation

Tue Oct 29 13:32:16 UTC 2019

Another approach could be to edit your OSM file.  You could identify the OSM nodes of the collapsed bridge (using openstreetmap.org) and remove them from the file.

From: Jason Dalton <jason.dalton at azimuth1.com>
Sent: Tuesday, October 29, 2019 6:54 AM
To: Mailing list to discuss Project OSRM <osrm-talk at openstreetmap.org>
Subject: Re: [OSRM-talk] Exclude bridge from OSRM calculation

Create a class in your OSM extract for the collapsed bridges.  Compile two different OSRM profiles - one that avoids class 'bridge-collapsed' and one that doesn't.

On Tue, Oct 29, 2019 at 7:27 AM ANDRES ABARCA <andres.abarca at iusspavia.it<mailto:andres.abarca at iusspavia.it>> wrote:
Hi Nikhil,

Thanks for the response! I was checking the car.lua and I will keep looking into it, but I think this would work for a generalized restriction. But I don't want to exclude all bridges, I want to exclude some specific ones (detected as collapsed).

Best regards,

Andres

Il giorno mar 29 ott 2019 alle ore 12:14 Nikhil VJ <nikhil.js at gmail.com<mailto:nikhil.js at gmail.com>> ha scritto:
Hi Andres,

Instead of trying to actually remove the bridge data, why not instruct (your own instance of) OSRM to avoid bridges when reading the OSM data?

Take a look at https://github.com/Project-OSRM/osrm-backend/blob/master/profiles/foot.lua

I don't know right now about bridges, but I was able to enable pedestrian routing over trunk roads by tinkering around in this file and then building and running OSRM.

--
Cheers,
Nikhil VJ
https://nikhilvj.co.in

On Tue, Oct 29, 2019 at 4:03 PM ANDRES ABARCA <andres.abarca at iusspavia.it<mailto:andres.abarca at iusspavia.it>> wrote:
Thank you for your response!

I'm still inclining to use OSRM directly. Do you know if it would be possible to exclude bridges from the analysis if I use one of the Docker images?

Also, in general, how would I proceed about removing a bridge? Should I (temporarily) remove it from the road data? Or could I query it out?

Thanks for the help!!

Best regards,

Andres

Il giorno ven 25 ott 2019 alle ore 14:16 Steven M. Ottens <steven at minst.net<mailto:steven at minst.net>> ha scritto:

Hi Andres,

The public web service doesn't allow for exclusion of roads/bridges. If you setup your own copy of OSRM you obviously do have the freedom to exclude anything.

Alternatively you could look into Rural Accessibility Map. An application on top of OSRM developed for the Worldbank which is used to calculate the impact of road improvements on the accessibility of a region. You can use it to other way around as well: Calculate the impact of a bridge collapse.

http://rah.surge.sh/about+

https://github.com/WorldBank-Transport/ram-backend

Cheers

Steven
On 25-10-2019 12:31, ANDRES ABARCA wrote:
Hi! I'm a PhD student at IUSS Pavia doing research on the impact of bridge collapse.

I want to use the OSRM public web server to calculate a duration matrix using the Table Service. How can I exclude a specific bridge (or several) from the query?

We use OSM information, so we do have the OSM id numbers for the bridges we would be excluding.

Thanks for any assistance you can provide.

Best regards,

Andres Abarca
PhD Student
IUSS Pavia

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