[OSRM-talk] Direction detection

[Gábor Boskovits]

Hello!

I have a project, where I need to know, in which direction a way was
traversed. I already file an issue on github, issue #4579. I basically
tried to extract the infomation by applying different forward and backward
tags, the results seems to be not ok though. Do you have any better way to
find out what direction the way is traversed? I the result I'm getting
really problematic, or it's just me misinterpreting it?
___
OSRM-talk mailing list
OSRM-talk@openstreetmap.org
https://lists.openstreetmap.org/listinfo/osrm-talk

Re: [OSRM-talk] Some questions

[Gandalf Corvotempesta]

2017-11-22 20:34 GMT+01:00 Daniel Patterson :
>   2) There is no built-in isochrone service.  I assume you're looking
>for GeoJSON polygons that contour away from the start point?
>   There are some WIP pull requests for isochrones (take a look
>   at the active pull requests), but nothing in the main codeline yet.
>   You can also generate them client-side using an approach like this:
>
> https://blog.mapbox.com/add-isochrones-to-your-next-application-e9e84a62345f
>   which uses the `table` plugin, instead of the route plugin.

Yes, I would like to generate some polygon, one for each travel time.
Probably, the best way would be to use one of the free online services (if any)
as I don't need to make this polygons very often (maybe once per month)
thus having the whole OSRM installed may be over kill.

___
OSRM-talk mailing list
OSRM-talk@openstreetmap.org
https://lists.openstreetmap.org/listinfo/osrm-talk

Re: [OSRM-talk] Some questions

[Daniel Patterson]

Hi Gandalf,

  1) If you edit `car.lua`, you can turn off the "exclusions",
  which will save some memory (perhaps 20%).  Other than that,
  not really.  If you pre-process using `car.lua`, you'll only get
  datafiles that are useful for car driving, it doesn't care about
  truck/walk/other restrictions.  In theory yes, much of the data
  isn't needed, but OSRM currently doesn't support *not* loading
  everything.

  2) There is no built-in isochrone service.  I assume you're looking
   for GeoJSON polygons that contour away from the start point?
  There are some WIP pull requests for isochrones (take a look
  at the active pull requests), but nothing in the main codeline yet.
  You can also generate them client-side using an approach like this:

https://blog.mapbox.com/add-isochrones-to-your-next-application-e9e84a62345f
  which uses the `table` plugin, instead of the route plugin.

  In general though, consider simply requesting the actual routes from
OSRM -
  they're generated pretty fast, even for interactive use.

3) The simplest way is to pre-merge the OSM datafiles using something
like
http://docs.osmcode.org/osmium/latest/osmium-merge.html

The only alternative would be to run several OSRM servers on
different
HTTP ports, and create a proxy in front that looks at the request
coordinates
and directs each request to the appropriate map.  No such thing
comes
with OSRM however, you'll need to build it yourself.

4) The osrm-routed memory usage depends on the size of your map.  For
the planet,
 with the car profile, it's in the order of 60-70GB.

5) Yes, `osrm-routed` supports seamless dataswaps.  Use `osrm-datastore
`
to load your data into shared memory, then run `osrm-routed -s` to
tell `osrm-routed`
to look in shared memory instead of loading files itself.
You can then replace the shared memory data with another invocation
of
`osrm-datastore `, and `osrm-routed` will seamlessly
swap to the
new dataset.
Note that you will need sufficient RAM to hold both sets of data in
memory during
the swapover.

daniel

On Wed, Nov 22, 2017 at 11:09 AM, Gandalf Corvotempesta <
gandalf.corvotempe...@gmail.com> wrote:

> Hi to all
> for a project, I have to calculate distance and travel time between 2
> points.
> I've tried, with success, OSRM. Some questions:
>
> 1) can I strip down as much as possible to keep the memory usage low ?
> I don't need any restricted turns for trucks and so on,
> the only needed profile is "car" and I only need to fetch distance and
> time, even directions are not needed.
>
> 2) would be possible to return a GeoJSON (or any other format) with
> isochrones from a defined point ? I would use this to pre-calculate an
> estimated travel time between points.
>
> 3) how can I load multiple maps with osrm-routed ?
>
> 4) which is the memory usage for osrm-routed ? I've pre-processed the
> maps on a huge computer and then i'm running osrm-routed on a server.
> Is that the sum of all *.osrm.* files ?
>
> 5) in case of map updates, can I "reload" osrm-routed without restarting
> it ?
>
> Thank you in advange.
>
> ___
> 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

[OSRM-talk] Some questions

[Gandalf Corvotempesta]

Hi to all
for a project, I have to calculate distance and travel time between 2 points.
I've tried, with success, OSRM. Some questions:

1) can I strip down as much as possible to keep the memory usage low ?
I don't need any restricted turns for trucks and so on,
the only needed profile is "car" and I only need to fetch distance and
time, even directions are not needed.

2) would be possible to return a GeoJSON (or any other format) with
isochrones from a defined point ? I would use this to pre-calculate an
estimated travel time between points.

3) how can I load multiple maps with osrm-routed ?

4) which is the memory usage for osrm-routed ? I've pre-processed the
maps on a huge computer and then i'm running osrm-routed on a server.
Is that the sum of all *.osrm.* files ?

5) in case of map updates, can I "reload" osrm-routed without restarting it ?

Thank you in advange.

___
OSRM-talk mailing list
OSRM-talk@openstreetmap.org
https://lists.openstreetmap.org/listinfo/osrm-talk