[mkgmap-dev] [PATCH v2] heed the through_route relation when adjusting turn headings

Wed Feb 10 22:47:25 GMT 2010

Paul escribió:
> Worked for me earlier today on a TOTSO that was previously missed.
>   
Tested with just one through_route relation, and also worked for me.
> Cheers
>
> Paul
>
> On 06/02/10 18:43, Mark Burton wrote:
>   
>> v2 - no longer requires the node to have role "junction"
>>
>> This patch also includes two other changes to the heading adjustment
>> code:
>>
>>     When matching arcs, as a last resort, match road class and speed.
>>     
>>     If at a node, an outgoing arc cannot be matched to an incoming arc by
>>     possiblySameRoad(), try to find a single outgoing arc that has the
>>     same road class and speed as the incoming arc and use that.
>>
>> and:
>>
>>     When adjusting turn headings apply all relevant adjustments.
>>     
>>     Previously, if a heading needed adjusting because the delta from the
>>     outgoing arc was too small, it did not then consider whether the delta
>>     from the incoming arc was too small also. Now, it considers both cases
>>     and adjusts the heading as appropriate.
>>
>> So please test even if you are not adding any through_route relations
>> and if you see any notable changes (good or bad) please say.
>>
>> --------------------
>>
>> This new relation (type through_route) specifies which 2 ways are the
>> "through route" at a junction. The relation requires 2 ways (no role
>> required) and a node with role = junction. It should only be used at
>> those junctions where the through route cannot be reliably inferred
>> from the ways' names and/or refs.
>>
>> Here's an example from my local town:
>>
>>      |   1
>>      |  /
>>      | /
>>      |/
>>      A
>>      |
>>      |
>>      |
>>      |
>>      B
>>     /|
>>    / |
>>   /  |
>>  2   |
>>
>> The vertical road is the "through route", i.e. you can drive from one
>> end to the other without crossing any white lines. But, from point 1 to
>> point 2 is a B road so ways 1-A, A-B, and B-2 all have some ref,
>> say, B1234.
>>
>> Without the through_route relation, mkgmap assumes (erroneously)
>> that the through route is 1-2 because all of the ways in that route
>> have the ref B1234.
>>
>> By adding 2 through_route relations (one at A and the other at B),
>> mkgmap is informed of the real through route and will take that into
>> account when adjusting the turn headings. The end result is that the
>> quality of the routing directions is improved (we hope).
>>
>> In this example, we need to have 2 relations because the B road
>> joins/leaves the through route at two places. 
>>
>> So if you know of any junctions that would benefit from this relation,
>> please add it to the map data and try this patch to see if it improves
>> the routing instructions.
>>
>> Mark
>>
>>   
>>
>>
>> _______________________________________________
>> mkgmap-dev mailing list
>> mkgmap-dev at lists.mkgmap.org.uk
>> http://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev
>>     
>
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>   

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