[GraphHopper] Closest edge lookup

[Laurent Bendel]

OK, I’m a happy camper. prepare.minOnewayNetworkSize=800 seems to do the trick. One needs to rebuild the graph though; by looking at the code, it looks like it discards these non-reachable islands at graph building time, which is exactly what I need. Well done ! Any drawback to raising this value to large numbers ?

Laurent

On 1 mars 2015, at 09:47, Laurent Bendel <asianrider at gmail.com> wrote:

> Peter,
> yes, I think you’ve put the finger on the problem: my map has lots of small ways that are not connected to the rest of the graph. So I think it actually finds an edge to start off with, but then it can’t find a route because it’s an island, although not a « oneway island », just an isolated island. So is the config prepare.minOnewayNetworkSize although useful in this case ?
> 
> In the SO issue you mention, it says that one should try to « decrease prepare.minNetworkSize », is that correct or do you mean actually « increase » the value ? and then should I recompile and rebuild the graph when I play with this value or can I just restart the server ?
> 
> Thanks,
> Laurent
> 
> On 28 févr. 2015, at 21:16, Peter <graphhopper at gmx.de> wrote:
> 
>> The default settings should be already sufficient for ~1000m
>> Maybe your start point is in a trap due to a barrier or similar?
>> Maybe you try http://stackoverflow.com/a/26433076/194609
>> 
>> Kind Regards,
>> Peter
>> 
>> 
>> On 28.02.2015 17:27, Laurent Bendel wrote:
>>> Hi all,
>>> no answer, but I’ve found these two setting in config.properties, which I changed as follows:
>>> 
>>> index.highResolution=1000
>>> index.maxRegionSearch=8
>>> 
>>> But it doesn’t seem to help. First question is, do I need to recompile after changing these two variables ? do I need to rebuild the graph ? well, I did both anyway, but it still sometimes returns « point 0 not found » when the coordinates is more than around 300-500m from the nearest road. Do I need to change something else ?
>>> 
>>> Thanks,
>>> Laurent
>>> 
>>> 
>>> On 23 févr. 2015, at 19:08, Laurent Bendel <asianrider at gmail.com> wrote:
>>> 
>>>> Hi all,
>>>> I’m trying to find which option controls the max distance taken in account when looking up the closest edge for the start and end point given in a search. In some areas that are very poorly mapped, it’s sometimes possible to give a coordinate that is too far away from the closest road and the server returns an error. I’d like to increase this value.
>>>> 
>>>> Thanks,
>>>> Laurent
>>>> 
>>> 
>> 
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