[GraphHopper] Building Distance Matrix offline

[Giampaolo]

Thanks for the answer Peter :)

Studying the code I realized that in the
class com.graphhopper.routing.util.CarFlagEncoder we have :

+ // autobahn+ defaultSpeedMap.put("motorway", 100);+ defaultSpeedMap.put("
motorway_link", 70);+ // bundesstraße+ defaultSpeedMap.put("trunk", 70);+
defaultSpeedMap.put("trunk_link", 65);+ // linking bigger town+
defaultSpeedMap.put("primary", 65);+ defaultSpeedMap.put("primary_link", 60
);+ // linking towns + villages+ defaultSpeedMap.put("secondary", 60);+
defaultSpeedMap.put("secondary_link", 50);+ // streets without middle line
separation+ defaultSpeedMap.put("tertiary", 50);+ defaultSpeedMap.put("
tertiary_link", 40);+ defaultSpeedMap.put("unclassified", 30);+
defaultSpeedMap.put("residential", 30);+ // spielstraße+ defaultSpeedMap.
put("living_street", 5);+ defaultSpeedMap.put("service", 20);+ // unknown
road+ defaultSpeedMap.put("road", 20);+ // forestry stuff+ defaultSpeedMap.
put("track", 15);
So in the hashMap defaultSpeedMap we have the default speed values for each
type of highway (http://wiki.openstreetmap.org/wiki/Key:highway) and i
suppose that these values are used to calculate travel times of each route.
Are they expressed in Km/h (e.g. motorway ? 100Km/h)? So if i decrement
these values the result is an increase  in travel time is right?

Thank for your help

Giampaolo

2014-11-27 13:22 GMT+01:00 Peter <graphhopper at gmx.de>:

>  This is a known issue and will be fixed soon:
> https://github.com/graphhopper/graphhopper/issues/230
>
> Regards,
> Peter
>
> On 27.11.2014 13:19, Giampaolo wrote:
>
> Hi Peter,
>
> thanks for your answer,I managed to build distance and time matrix :)
>
> I have a question about values returned from res.getMillis() : they are
>  always lower than the values provided by google maps or bing.
>
> As example , a route of 3,7 Km in the center of Milan city is :
>
> 10 Min - GoogleMaps
> 8 Min - Bing
> About 4 Min - my time matrix
>
> these values are referred to routes without traffic.How can I make my
> values consistent with those?
>
>
>
> 2014-11-23 15:31 GMT+01:00 Peter <graphhopper at gmx.de>:
>
>>  Hi Giampaolo,
>>
>> you need to get the route information like distance and time from the
>> hopper.route() call like in this example:
>>
>> https://github.com/karussell/optaplanner-graphhopper-example/blob/master/src/main/java/com/graphhopper/optaplanner/Main.java#L59
>>
>> Regards,
>> Peter
>>
>>
>>
>> On 23.11.2014 14:38, Giampaolo wrote:
>>
>>   Hi all J ,
>>
>> My name is Giampaolo, I’m currently trying to build a Distance Matrix
>> offline, based on Italy’region OSM Map, using GH
>>
>> As a first step I’ve run the main.java successfully ,my sourcefile is
>> lombardia.pbf (the region that contains Milan city) , then I pass the
>> GHPoint(45.4974413, 9.1865076) of a station point placed inside the city,
>> then I call hopper.route().
>> At the end of the process, it generates  some files like edges, names,
>> nodes etc …
>>
>> Now , how can I read/open the files created? All the path from the
>> GHPoint to all other nodes of the map are placed inside these files?
>>
>> thanks a lot for your support!
>>
>> Giampaolo
>>
>>
>
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