[OSRM-talk] Plotting position in time using OSRM

[S R]

Hi Carsten 

Many thanks....the link you mention shows the route instructions describe each street and gives the position of the start point, its length, and time in seconds.
This is very helpful.
Still the documentation is not fully clear (to me).

Take the example in the link: 
    ["Turn left",    "High Street",    200,                   <------ 200 m long
    4,                        <------ position (of the starting point on the street?)
    10,                      <------- time to traverse this street?
    "200m",    "NE",    22.5    ]
My questions are:
1. What is the lat/long of the starting position on High Street i.e how to convert "4" to lat/long. 

    I think this has to do with via indices and via points in the link you mention, but that seems a bit murky (at least to me). Any clarification would help a lot.    What is the difference between via_indices and via_points. Is there a via_point for each point in the route instruction? Can I just use one or the other?

2. After say 5 seconds of travel on High Street, what would be the lat/long of the new position.

ThanksSriram

      From: Carsten Malchow <carsten64stadt at gmx.de>
 To: osrm-talk at openstreetmap.org 
 Sent: Wednesday, December 3, 2014 10:43 AM
 Subject: Re: [OSRM-talk] Plotting position in time using OSRM
   
Hi Sriram to reply a part of your question:take a look at this documentacion [1]The first number is driving directions.The geomerty is a compressed tring that you have to decompress.also discripted in the Link below. Kind regards Carsten [1] https://github.com/Project-OSRM/osrm-backend/wiki/Output-jsonGesendet: Mittwoch, 03. Dezember 2014 um 09:58 Uhr
Von: "S R" <sriram_ott at yahoo.com>
An: "osrm-talk at openstreetmap.org" <osrm-talk at openstreetmap.org>
Betreff: [OSRM-talk] Plotting position in time using OSRM

I would like to create a simple simulation of  a trip using OSRM. I believe the steps would be as follows (my questions are in parenthesis below) a. Load OSM map of a city into OSRMb. Choose a random begin, end location that falls within the city lat/long (how to find lat/long limits of the loaded map?)c. Compute the distance (in time) between start, end using OSRMd. Also compute a path between start, end using OSRM (are the node vertices mentioned in route the same as in the OSM map?)e. The difficult part:    -- start the simulation by displaying the map along with position marker (Leaflet?)    -- As time progresses, determine the location along the OSRM route computed above (how can this be done?)       and adjust the position marker.   An OSRM route looks like this:"route_instructions": [
        [
            "10",    <-------------------- what is this id and how to convert it to lat/long
            "Schulstraße",
            126,
            0,
            18,
            "126m",
            "SE",
            116
        ],
        [
            "7",     <----------------  how to find elapsed time to this point from previous one
            "Am Rahmtor",
            57,
            2,
            11,
            "57m",
            "NE",
            38
        ]

Given a start and end lat/long, a network distance (time) can be obtained as follows:
"distance_table": [
        [
            0,
            26084
        ],
        [
            26084,
            0
        ]

This would be useful if the route way-points above could be converted into time units.
Would appreciate any help with the above questions,Sriram_______________________________________________ OSRM-talk mailing list OSRM-talk at openstreetmap.org https://lists.openstreetmap.org/listinfo/osrm-talk
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