Thanks Carsten.
To clarify then:
a. if position is 4, i can find the location of the corresponding start point
using via_point[4].
This does not seem correct though when I look at the example API
(Requesting Routes section):
https://github.com/Project-OSRM/osrm-backend/wiki/Server-api
In that case there is only start and end, but the route_instructions
array has 6 elements.
The position values of these 6 elements are 0, 2, 3, 8, 17, 20.
The via_points array has only 2 elements.
So it is not clear how to interpret the "position" attribute.
b. I realize now that the travel times is the time for travel to the next via
point. That is why the end point has a travel time of 0.
It is still unclear of course how I can figure out the lat+long of position
along a street.
ThanksSriram
From: Carsten Malchow <[email protected]>
To: [email protected]
Sent: Wednesday, December 3, 2014 11:49 AM
Subject: Re: [OSRM-talk] Plotting position in time using OSRM
Hi, ["Turn left", "High Street", 200, /// yes this is
Integer in the unit of meters from the last instruction 4,
// Posistion of instructions according to the geomerty and of course to
the start point // dont be scared if this number
not follwong the ristrict order if of 3 not follwos 4.
// as I understand this correct this occur because of a generalizaion of
the raw geomerty, with this some points can be eliminate. 10,
//Travel time to this point from the last instructions "200m",
"NE", 22.5 ]1.)via_points just give the coordinates back of start/end and
intermieat pointsvia_indices look this:
https://github.com/Project-OSRM/osrm-backend/issues/1020 2.) I think this you
have to calculated by your self. regards CarstenGesendet: Mittwoch, 03.
Dezember 2014 um 11:04 Uhr
Von: "S R" <[email protected]>
An: "Mailing list to discuss Project OSRM" <[email protected]>
Betreff: Re: [OSRM-talk] Plotting position in time using OSRM
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 <[email protected]>
To: [email protected]
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" <[email protected]>
An: "[email protected]" <[email protected]>
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
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