[mkgmap-dev] Problem with adjust-turn-headings

Sat May 10 16:34:45 BST 2014

Hi WanMil,

sorry, I read the comments multiple times, but I also don't know what it
does
in detail. It changes the "initial heading" value of an arc if some
criteria are met, this initial heading value is written to the img file
and Garmin uses it to calculate the angle between two arcs.
This angle has an influence on routing (sharp angles are avoided)
and it is used to create hints like "turn left" or "keep left".
I did never try to find out if the used threshold values are good.
I am pretty sure that the algo is not aware that one OSM way
may be used for multiple routable ways, so if you have a closer
look, please check this as well.

Gerd

WanMil wrote
> Hi Gerd,
> 
> mmh, I don't understand what happens in the tweezeArcs method.
> Can you explain in some sentences?
> 
> WanMil
> 
>> Hi WanMil,
>>
>> forget the 1dt sentence. I have no idea why the algo changes anything in
>> this situation.
>>
>> Gerd
>>
>>
>> GerdP wrote
>>> Hi WanMil,
>>>
>>> I think the algo should not use/need the finalHeading value.
>>> You may look at the algo in RoadNetwork.getAngle().
>>>
>>> Gerd
>>> WanMil wrote
>>>> Hi,
>>>>
>>>> I have found a situation where --adjust-turn-headings creates a non
>>>> useful turn hint.
>>>> Compile the file:
>>>>    http://files.mkgmap.org.uk/detail/207
>>>> with parameters --route and --adjust-turn-headings (maybe also
>>>> --x-no-mergeroads for easier debugging).
>>>> Try a route from Frankfurter Straße to Eilper Straße.
>>>> Mapsource and the GPS give a hint that you have to turn right on the
>>>> junction of Frankfurter Straße and Eilper Straße although the street is
>>>> straight.
>>>>
>>>> Logging of the RouteNode class gives the hint:
>>>> Adjusting turn heading from -52.342655 to -99.54512 at junction of
>>>> (http://www.openstreetmap.org/browse/way/31171248) and
>>>> (http://www.openstreetmap.org/browse/way/144387754) at
>>>> http://www.openstreetmap.org/?mlat=51.349647&mlon=7.484266&zoom=17
>>>>
>>>> For me the initial heading -52.34... looks weird.
>>>> Gerd, do you have any ideas?
>>>>
>>>> WanMil
>>>> _______________________________________________
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>>
>>>> mkgmap-dev at .org
>>
>>>> http://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev
>>
>>
>>
>>
>>
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