[GraphHopper] Routing has gaps

[Timothy Lehner]

What is the best way to suppress the Douglas-Peucker filter?
If I am using the routing in one of my java applications, and I open it
using:

hopper = new GraphHopper().
hopper.setInMemory(true);
hopper.setOSMFile(osmFile);

// where to store graphhopper files?

hopper.setGraphHopperLocation(graphFolder);
hopper.setEncodingManager(new EncodingManager("car"));

// now this can take minutes if it imports or a few seconds for loading
// of course this is dependent on the area you import
hopper.importOrLoad();


Do I need to stop the map getting simplified before this? That is to say,
should this setting be changed BEFORE the contents of graphFolder are
generated? (should I re-generate the graph?)

It is vital that I don't lose any information on the customised .osm maps
that I give, the nodes all need to be accounted for. Luckilly I am not
doing large scale routing (city - scale only) so I think any performance
hits this takes should be manageable. Please advise where to go next / what
to read to better familiarise myself with GraphHopper

Many thanks!
Tim


On 4 August 2014 17:08, Nop <ekkehart at gmx.de> wrote:

>
> Hi!
>
> As Timothy said, the result is simplified by default. Most likely those
> points were removed, as additional points along a straigt line are not
> needed.
>
> So I think everything is working fine. If you want ALL points, you need to
> disable the Douglas-Peucker or set the tolerance to a very small value.
>
>
> bye
>                     Nop
>
>
> Am 04.08.2014 16:38, schrieb Timothy Lehner:
>
>> Hello All,
>>
>> Sorry for the confusion, I'll try to be clearer.
>>
>> I have an open street map with a section that may look like this:
>>
>>
>> ​
>> I want to travel along the green path. When routing, the route is
>> returned as a list of co-ordinate points.
>>
>> For the stretch of road with the circles, the route says I should travel
>> from the co-ordinate of the green circle, to that of the blue circle,
>> however it has missed out the three nodes in between (red).
>>
>> As a result I cannot traverse the route, as I see no way to travel from
>> the green circle, directly to the blue circle, I must travel via the red
>> circles which have been omitted.
>>
>> I was wondering if there was a way to have the route returned detailing
>> every node that needs to be visited, and in the order it needs visiting,
>> (so instead of getting 2 points, here I'd expect to get 5)
>>
>> Does this make things clearer?
>>
>> Many thanks,
>>
>> Tim
>> ​
>>
>>
>> On 4 August 2014 15:20, Jan Torben Heuer <jan at komoot.de
>> <mailto:jan at komoot.de>> wrote:
>>
>>
>>     Am 04.08.2014 um 15:22 schrieb Timothy Lehner <tim at accelogress.com
>>     <mailto:tim at accelogress.com>>:
>>
>>
>>      For example, if my OpenStreetMap has a few close packed nodes, the
>>>     route calulcated will have maybe two latLong points. The lat long
>>>     points of the nodes in between are missed.
>>>
>>
>>     Not sure what „close packed nodes“ are but:
>>     - There is a maximum accuracy (10e-6?) due to packing the
>>     coordinates into integer values.
>>     - There is a default douglas peucker hat simplifies geometries.
>>
>>     Maybe one of it is the reason.
>>
>>     Ja
>>
>>     _______________________________________________
>>     GraphHopper mailing list
>>     GraphHopper at openstreetmap.org <mailto:GraphHopper at openstreetmap.org>
>>     https://lists.openstreetmap.org/listinfo/graphhopper
>>
>>
>>
>>
>>
>> _______________________________________________
>> GraphHopper mailing list
>> GraphHopper at openstreetmap.org
>> https://lists.openstreetmap.org/listinfo/graphhopper
>>
>>
>
> _______________________________________________
> GraphHopper mailing list
> GraphHopper at openstreetmap.org
> https://lists.openstreetmap.org/listinfo/graphhopper
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.openstreetmap.org/pipermail/graphhopper/attachments/20140805/d3b520c6/attachment.html>