CODEWITHSUNDEEP
openstreetmaposrm
Sim
Sim

Reputation: 97

OSM routing on ferry lines

I am building a tool that aims to display and store public transport trips. I currently have train, bus and air travel working, and I would like to add ferry.

For Bus, I currently use the OSRM. For train, I use a custom version of the OSRM that uses tracks instead of roads. And for air, I simply plot a geodesic between the airports.

I am at a bit of a loss concerning the ferries. In OSM, they are stored as either relations or ways, but I don't know how I could find only the part between 2 points.

Would anyone have an idea of how to get this ?

Upvotes: 0

Views: 518

Answers (2)

Chris
Chris

Reputation: 85

Valhalla comes with built-in support for ferries. You can try it using the public instance hosted on openstreetmap.

It also lets you define custom preference and waiting time for ferries, as specified in the API reference.

If you really only want to route on ferry lines, you would probably have to build a custom graph from an OSM extract that only includes ferry lines.

Upvotes: 0

Sim
Sim

Reputation: 97

I ended up running another OSRM server with a ferry.lua like so :


api_version = 4

Set = require('lib/set')
Sequence = require('lib/sequence')
Handlers = require("lib/way_handlers")

function setup()
  local ferry_speed = 30  -- ferry speed in km/h
  return {
    properties = {
      weight_name                   = 'duration',
      max_speed_for_map_matching    = 30/3.6,  -- kmph -> m/s
      call_tagless_node_function    = false,
      use_turn_restrictions         = false,
    },

    default_mode            = mode.ferry,
    default_speed           = ferry_speed,
    oneway_handling         = 'ignore',  -- allow traversal in both directions

    -- Only allow ways tagged as ferry route
    access_tag_whitelist = Set {
      'ferry'
    },

    speeds = Sequence {
      route = {
        ferry = ferry_speed,
      }
    },
  }
end

function process_node(profile, node, result)
  -- empty, ferry routes are mainly defined by ways, not nodes
end

function process_way(profile, way, result)
  -- only consider ways tagged with 'route=ferry'
  local is_ferry = way:get_value_by_key('route')
  if is_ferry == 'ferry' then
    result.forward_mode = mode.ferry
    result.backward_mode = mode.ferry
    result.forward_speed = profile.default_speed
    result.backward_speed = profile.default_speed
  else
    result.forward_mode = mode.inaccessible
    result.backward_mode = mode.inaccessible
  end
end

return {
  setup = setup,
  process_way =  process_way,
  process_node = process_node,
}

Upvotes: 0

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