[mkgmap-dev] Garmin directing to connected crossing roads

Tue Mar 27 20:58:01 BST 2018

Great, I'll check on that one. That seems to hve some similarities to 
GroundTruth style.

I never thought off All In One map because my custom style is based on 
(very old) AIO.

On 03/27/2018 10:06 PM, Gerd Petermann wrote:
> Maybe this one helps:
> https://wiki.openstreetmap.org/wiki/DE:All_in_one_Garmin_Map/Garmin_Types#Lines
> 
> Gerd
> ________________________________________
> Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag von Harri Suomalainen <hsuomal at welho.com>
> Gesendet: Dienstag, 27. März 2018 20:51:48
> An: mkgmap-dev at lists.mkgmap.org.uk
> Betreff: Re: [mkgmap-dev] Garmin directing to connected crossing roads
> 
> I'll need to test that to see more.
> 
> Is there any good source about line types, I'd like to check other types
> as well. (I noticed after some searching that GroundTruth seems to use
> 0x08 as a _link type too but I fail to find a good source for what lines
> garmin usis for what purpose)
> 
> 
> On 03/26/2018 10:08 AM, Gerd Petermann wrote:
>> Hi Harri,
>>
>> I think the problem is that you use type 0x08 for unclassified. This type is special, it should be used for _link  roads.
>> When you use e.g. 0x06 instead the problems are gone.
>>
>> Gerd
>>
>>
>> ________________________________________
>> Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag von Harri Suomalainen <hsuomal at welho.com>
>> Gesendet: Samstag, 24. März 2018 13:35:16
>> An: mkgmap-dev at lists.mkgmap.org.uk
>> Betreff: [mkgmap-dev] Garmin directing to connected crossing roads
>>
>> I've noticed locations where my Garmin gives directions to use crossing
>> street (like small service roads) when routing through a single route.
>>
>> A good example is unclassified "Juurakkotie" at
>> https://www.openstreetmap.org/#map=18/60.29121/24.99298
>> (I'm using current data from Geofabric extracts and the road has not
>> changed recenty and it is verified to be as straight as josm makes it)
>>
>> When Garmin routes through it from west to east, it tells multiple times
>> to go the the service, to the service, ...about 4 times or so (and I
>> think only twice when routing from east to west). Map line is straight
>> through Juurakkotie (ie no routing through yards).
>>
>> (Not sure what word garmin uses exactly in different languages to the
>> road type it suggests taking to, but it varies from device to another
>> anyway)
>>
>> My style has following lines:
>>
>> # To avoid routing through service roads
>> highway=service { set access=destination }
>> # Low road class definition for service
>> highway=service [0x07 road_class=0 road_speed=2 resolution 24]
>> # Higher road class for unclassified
>> highway=unclassified [0x08 road_class=2 road_speed=3 resolution 22]
>> # and in finalize-section
>> access=destination     { set mkgmap:throughroute=no; set access=yes }
>>
>> I see no reason why it should consider the connecting routes something
>> one should go to and instruct so. (My style also should make service
>> type road avoided anyway for routing if possible).
>>
>> I've occationally noticed this kind of behaviour with my old Nuvi 755
>> also (currently using Drivesmart 61). (Getting multiple turn to..turn
>> to..turn to.. instractions repeated is quite annoying when it happens)
>>
>> I wonder if this is some kind of "feature" of Garmin or some kind of bug
>> in stored road geometry or if this is something to deal with my style.
>>
>> I compile map with following options
>> --max-jobs=8 --link-pois-to-ways --add-pois-to-areas
>> --reduce-point-density=3 --merge-lines --reduce-point-density-polygon=1
>> --drive-on=right --country-name=FINLAND --country-abbr=FIN
>> --area-name=Finland --latin1 --code-page=1252
>> --generate-sea=multipolygon,extend-sea-sectors,close-gaps=2000,floodblocker"
>> --location-autofill=is_in --x-housenumbers --housenumbers
>> --process-destination --process-exits
>>
>> This kind of behaviour has existed for years and currently I'm using
>> latest mkgmap-dev. I run into it only occationally and when I do it is
>> repeatable in the locations.
>>
>> Chears,
>> Harri
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