[mkgmap-dev] Garmin directing to connected crossing roads

Tue Mar 27 19:51:48 BST 2018

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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