Thanks Carsten...I understand a bit better now..
By the way, I am not clear where I should be looking for the AJAX response (to
see the via_point values and route_instructions) in firebug output...can you
provide some guidance? I see the firebug output at the bottom of the map...
I will ignore the via_indices as you pointed out there may be errors with it.
And I guess interpolation using the azimuth? would work?
Regards
Sriram
From: Carsten Malchow <[email protected]>
To: [email protected]
Sent: Wednesday, December 3, 2014 12:35 PM
Subject: Re: [OSRM-talk] Plotting position in time using OSRM
Please look at this exampleand open firebug to see the JSON response.here I add
a Way point. there you see that the via_point has 3 elements as also the
via_indices, but this via_indices not corrosponed to any numbers in the
route_instruction.If you reach the way point then in the route instruction the
driving directions contains the number 9, for the start points is 10 and for
the end point is 15. Also you start from a point and all information you have
is related to the next point. Means for example your startpoint contains an
entry of 200m means that in 200m the next point is coming. osrm.at/ag6 I hope I
could example this clearly now. According to you b.) question may be
interpolation would help, becouse you have only route instructions if a bigger
change in the direction will occure.reagardsCGesendet: Mittwoch, 03. Dezember
2014 um 12:20 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
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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