[mkgmap-dev] Wrong turn heading when using --process-exits

Sun Jan 12 21:41:02 GMT 2014

Hi Jonas,

I have checked your test case. The way 4400960 is still on the right 
side of the motorway even after cutting. But the distance is very small 
and there might be some rounding problems of the GPS device.

mkgmap calculates the angle between the link and the motorway before and 
after cutting. Before cutting the angle is 3.55° and after cutting it is 
0.28°. Maybe the 0.28° is too small and mgkmap need to correct it. I'll 
put it on my TODO list.

WanMil

> Hi Jonas,
>
> thanks for the test case.
> I will have a look on it but it will take some time.
>
> WanMil
>
>> Oh, I forgot the link to the minimal test map and .osm extract:
>>
>> http://brutus.dalom.com/~jetthe/OSM/mkgmap/lkpg_113/
>>
>> /Jonas
>>
>>
>> On Mon, Jan 6, 2014 at 10:18 PM, Jonas Tull <jonas at dalom.com
>> <mailto:jonas at dalom.com>> wrote:
>>
>>     Hi!
>>
>>     I have an issue where a motorway_link which is modified by
>>     --process-exits gives the wrong turn heading instruction in my GPS
>>     (Nüvi 205). "Turn left at Exit 113" instead of "Turn right at Exit
>> 113".
>>
>>     The way is http://www.openstreetmap.org/way/4400960
>>
>>     When looking at the map in QLandkarte it looks like the first two
>>     ways created when the _link way is split are almost parallel to the
>>     motorway. My guess is that it's somehow related to the relatively
>>     long distance between the first and second node in the original
>>     _link way.
>>
>>     I build my maps with the following (relevant?) arguments:
>>     --adjust-turn-headings --route --housenumbers --process-destination
>>     --process-exits
>>
>>     This issue can also be seen in the maps downloaded from
>>     http://garmin.openstreetmap.nl/
>>
>>     /Jonas
>>
>>
>>
>>
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>
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