DO you mean a new osm tag? Doesn't the existing tags you mention cover surface quality?
Med venlig hilsen Emil Tin IT- og Processpecialist Trafik _______________________________ KØBENHAVNS KOMMUNE Teknik- og Miljøforvaltningen Byens Anvendelse Njalsgade 13 Vær. 118 Postboks 380 2300 København S Direkte 2369 5986 Mobil 2369 5986 Email z...@tmf.kk.dk EAN 5798009493149 -----Oprindelig meddelelse----- Fra: Fernando Trebien [mailto:fernando.treb...@gmail.com] Sendt: 28. februar 2014 17:35 Til: Emil Tin Cc: osrm-talk Emne: Re: [OSRM-talk] Beginner question: default car profile and tracktype/smoothness/surface Thank you Emil and Hans. I didn't know about the biking profile. Even though I'm a cyclist as well, I've been using the website mostly for car routing, and that's what OSRM is most known for here in Brazil. A while ago, I participated in a debate about making OSM-Carto use a different visual style to display roads in "worse than usually expected" state. As the debate developed, I made up a surface classification system that captures similarities among tags that represent "transit effort" (tracktype, smoothness, mtb:scale, sac_scale, wheelchair, 4wd_only, and surface) for various modes of transportation. I wonder if you'd be interested in something along this line, then I would go ahead and propose an official tag for it. On Fri, Feb 28, 2014 at 5:26 AM, Emil Tin <z...@tmf.kk.dk> wrote: > > > Surface is already taken into account for bicycles in the OSRM main repo: > > https://github.com/DennisOSRM/Project-OSRM/blob/master/profiles/bicycl > e.lua > > However, instead of multiplying, I found it more realistic to simply use the > surface speed, instead of multiplying: > > surface_speeds = { > ["asphalt"] = default_speed, > ["cobblestone:flattened"] = 10, > ["paving_stones"] = 10, > ["compacted"] = 10, > ["cobblestone"] = 6, > ["unpaved"] = 6, > ["fine_gravel"] = 6, > ["gravel"] = 6, > ["fine_gravel"] = 6, > ["pebbelstone"] = 6, > ["ground"] = 6, > ["dirt"] = 6, > ["earth"] = 6, > ["grass"] = 6, > ["mud"] = 3, > ["sand"] = 3 > } > > > -- surfaces > if surface then > surface_speed = surface_speeds[surface] > if surface_speed then > if way.speed > 0 then > way.speed = surface_speed > end > if way.backward_speed > 0 then > way.backward_speed = surface_speed > end > end > end > > Both approaches might have merit. > > > > Kind regards, > > Emil Tin > IT- and Process Specialist > Traffic Design > ________________________________ > CITY OF COPENHAGEN > The Technical and Environmental Administration Traffic Department > > Islands Brygge 37 Vær. 118 > Postboks 450 > 2300 København S > > Telefon +45 2369 5986 > Email z...@tmf.kk.dk > EAN 5798009493149 > > > -----Oprindelig meddelelse----- > Fra: Hans Gregers Petersen [mailto:greg...@septima.dk] > Sendt: 28. februar 2014 09:16 > Til: osrm-talk@openstreetmap.org > Emne: Re: [OSRM-talk] Beginner question: default car profile and > tracktype/smoothness/surface > > Hi Fernando, > >> I've always wondered if there are any plans taking surface >> type/quality into account in the default profiles. I live in a >> developing country (Brazil) with poorly maintained roads and these >> conditions make a big difference at the beginning and at the end of >> many routes if ignored. > > I do not know about the plans regarding the default profile, but I > successfully used a simple "factor approach" to surfaces when doing our > routing on bicycle paths here in Denmark. > For instance setting the following in the LUA profile: > > -- How much does speed depreciate by surface surface_factors = { > ["unpaved"] = 0.8, ["gravel"] = 0.8, ["cobblestone"] = 0.8, ["dirt"] = > 0.8, ["earth"] = 0.8, ["sand"] = 0.8, ["cobblestone:flattened"] = 0.9, > ["compacted"] = 0.9, ["fine_gravel"] = 0.9, ["wood"] = 0.9 } > > and then later adjuste the speed accordingly: > > -- Surface tag > local surfacetag = way.tags:Find("surface") > > -- Surface factor > if surface_factors[surfacetag] then > way.speed = way.speed * surface_factors[surfacetag] way.backward_speed > = way.backward_speed * surface_factors[surfacetag] end > > > > Best regards, > > Greg > > > > Hans Gregers Petersen > Partner, Senior Consultant > www.septima.dk > > _______________________________________________ > OSRM-talk mailing list > OSRM-talk@openstreetmap.org > https://lists.openstreetmap.org/listinfo/osrm-talk > > _______________________________________________ > OSRM-talk mailing list > OSRM-talk@openstreetmap.org > https://lists.openstreetmap.org/listinfo/osrm-talk -- Fernando Trebien +55 (51) 9962-5409 "The speed of computer chips doubles every 18 months." (Moore's law) "The speed of software halves every 18 months." (Gates' law) _______________________________________________ OSRM-talk mailing list OSRM-talk@openstreetmap.org https://lists.openstreetmap.org/listinfo/osrm-talk
