[GraphHopper] Load a custom edge weight

[Peter]

Hi!

> Do you have any documentation on how simplification works? For
> example, raising the value of the property
> osmreader.wayPointMaxDistance to 5 (suggested value for Android)
> reduces  the overall number of edges generated or the complexity of
> the single edge?

just the number of lat/lon points per edge via douglas peucker algorithm

> By disabling this option do you mean set the value to 0?
Yes

Peter

>
> On 3/4/15 6:25 PM, Peter wrote:
>> If you turn off simplification while import, yes
>> (hopper.setWayPointMaxDistance). Although still not identical as you can
>> get rounding differences
>>
>> Peter
>>
>> On 04.03.2015 18:13, Rossano Schifanella wrote:
>>> Are those coordinates exactly the ones in the OSM node data without
>>> any kind of processing?
>>>
>>> Thanks
>>> Rossano
>>>
>>> On 3/4/15 1:41 PM, Peter wrote:
>>>> edgeState.fetchGeometry() gives you all the geometry
>>>>
>>>> or use nodeAccess.getLat/Lon(edgeState.getBaseNode/AdjNode) to get
>>>> only
>>>> the end points
>>>>
>>>> Peter
>>>>
>>>> On 04.03.2015 13:36, Rossano Schifanella wrote:
>>>>> That was the problem! I didn't specify the vehicle with setVehicle
>>>>> when a GHRequest was created.
>>>>>
>>>>> I have another quick question: is it possible through the
>>>>> LocationIndex or something similar to have for each edge in the graph
>>>>> the coordinates (lat, lon) of the end points?
>>>>>
>>>>> Thanks!
>>>>> Rossano
>>>>>
>>>>>
>>>>> On 3/4/15 1:26 PM, Peter wrote:
>>>>>>> In my case CH is turned off and I still get this exception when I
>>>>>>> issue a routing request. Do you think is it possible?
>>>>>> This should not happen - maybe this was a bug. Do you explicitly
>>>>>> specify
>>>>>> the vehicle in the request?
>>>>>> And is it still the case with the current master?
>>>>>>
>>>>>> Peter
>>>>>>
>>>>>>>> Regards,
>>>>>>>> Peter
>>>>>>>>
>>>>>>>> On 02.03.2015 22:44, Rossano Schifanella wrote:
>>>>>>>>> Peter,
>>>>>>>>>
>>>>>>>>> thanks for the hint, I used the location index to find the
>>>>>>>>> closest
>>>>>>>>> edge and it worked. I have a couple of additional questions:
>>>>>>>>>
>>>>>>>>> - After having implemented a custom weight, I'm wandering if it's
>>>>>>>>> possible to set a threshold in the length or travel time over
>>>>>>>>> which a
>>>>>>>>> tentative path is discarded (e.g., using astarbi)? Note that the
>>>>>>>>> implemented custom weight doesn't use distance nor speed as
>>>>>>>>> measure.
>>>>>>>>> - What is the meaning of the method getMinWeight when, for
>>>>>>>>> example,
>>>>>>>>> astarbi is used?
>>>>>>>>> - Is it possible to specify more than a value for the property
>>>>>>>>> graph.flagEncoders (e.g., BIKE, FOOT) ? When I tried I got this
>>>>>>>>> exception: java.lang.IllegalStateException: Multiple encoders are
>>>>>>>>> active. cannot return one:bike,foot
>>>>>>>>> What am I doing wrong?
>>>>>>>>>
>>>>>>>>> Thanks a lot!
>>>>>>>>> Regards,
>>>>>>>>> Rossano
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> On 2/28/15 9:21 PM, Peter wrote:
>>>>>>>>>> Hi Rossano,
>>>>>>>>>>
>>>>>>>>>> while import you'll have to store the mapping from osm node to
>>>>>>>>>> internal
>>>>>>>>>> node, then you can easily do what you proposed. A more generic
>>>>>>>>>> solution
>>>>>>>>>> would be to use GPS locations instead of OSM nodes to specify
>>>>>>>>>> the
>>>>>>>>>> weighting and then using the location index to lookup the
>>>>>>>>>> closest
>>>>>>>>>> edge.
>>>>>>>>>>
>>>>>>>>>> Then you have the edgeId to weight mapping which you could
>>>>>>>>>> either
>>>>>>>>>> put
>>>>>>>>>> into the edge directly, or just use a double array where the
>>>>>>>>>> edgeId is
>>>>>>>>>> the index. Or use DataAcess which is a storable array for many
>>>>>>>>>> purposed.
>>>>>>>>>>
>>>>>>>>>> Regards,
>>>>>>>>>> Peter
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> On 27.02.2015 23:08, Rossano Schifanella wrote:
>>>>>>>>>>> Hi there,
>>>>>>>>>>>
>>>>>>>>>>> suppose I have an external file with this format
>>>>>>>>>>>
>>>>>>>>>>> OSM_NODE_ID1    OSM_NODE_ID2    w1
>>>>>>>>>>>
>>>>>>>>>>> where OSM_NODE_ID1 and OSM_NODE_ID2 are two OSM node ids and w1
>>>>>>>>>>> is a
>>>>>>>>>>> double that represents a custom weight. What I'd like to do is:
>>>>>>>>>>>
>>>>>>>>>>> 1) Find the edge gh_edge_id in the GraphHopper internal data
>>>>>>>>>>> structure
>>>>>>>>>>> that corresponds to the the edge OSM_NODE_ID1->OSM_NODE_ID2
>>>>>>>>>>>
>>>>>>>>>>> 2) Create a data structure that maps the relation
>>>>>>>>>>>
>>>>>>>>>>> gh_edge_id    w1
>>>>>>>>>>>
>>>>>>>>>>> in a way that at runtime in a custom Weighting class I can
>>>>>>>>>>> retrieve
>>>>>>>>>>> the value w1 when the corresponding edge is visited.
>>>>>>>>>>>
>>>>>>>>>>> Which is the best approach to tackle this problem?
>>>>>>>>>>>
>>>>>>>>>>> Thanks a lot for your support.
>>>>>>>>>>>
>>>>>>>>>>> Rossano
>>