[mkgmap-dev] routing across tile borders

Thu Aug 30 13:08:51 BST 2012

It would be interesting, if you could compile a testmap with cgpsmapper 
to crosscheck. Maybe cgpsmapper doesn't have this bug - then it would be 
an mkgmap bug (and based on long distance routing with mgkmap created 
maps, I think it is likely such a bug exists). If however an identical 
cgpsmapper created map has the same problem, then it will be difficult 
to know whether both cgpsmapper and mkgmap got it wrong (they are still 
largely based on the same garmin map sourcecode analysis), or whether 
the bug is on Garmins side. Actually however I would guess it's an 
mkgmap and or mkgamp/cgpsmapper bug - as tile borders have always caused 
problems.
On 30.08.2012 13:59, Minko wrote:
> I have found a workaround that forces pedestrian routing across the tile borders, simply by setting toll road avoidance ON.
>
> This seems very irrational because the issue is that roads that are blocked across the tile borders are the ones that carry the flag toll=yes, but somehow they are only accessible in this mode. Clearly there is a bug somewhere...
>
>
>
>> I investigated the case and came to the following conclusion:
>>
>> -roads marked with toll=yes are not routable across a tile border in
>> case of pedestrian routing.
>> -within the tile itself, routing is ok
>> -Car or bicycle navigation respond as expected, no problems here
>> -this isssue is only observed in Mapsource, not in Basecamp nor on the
>> GPS.
>> -I tested it with several maps and also older mkgmap versions they all
>> show the same issue.
>>
>> BTW I use toll=yes to mark all roads without a cycling route to force
>> the routing on cycling routes when you choose toll road avoidance.
>>
>>
>> Is this a known issue?
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-- 
keep on biking and discovering new trails

Felix
openmtbmap.org & www.velomap.org