[mkgmap-dev] Problem in AngleFixer?

Sat Aug 10 08:39:07 BST 2024

Hi Ticker,

Am 2024-08-09 12:48, schrieb Ticker Berkin:
> Hi Thorsten
> 
> I don't see an easy solution to your second example, the "turn-off" is 
> almost
> straight on.
> 
> I don't understand why my change didn't fix your first example, unless 
> you
> allocate different road speed/class for different smoothness, surface, 
> tracktype
> tags, in which case the continuous way might be lower priority than the 
> joining
> way and the algorithm prefers to this.

To get that right: Your patch fixes one half of my first example: if you 
let Garmin calculate the route, it will now use the junction and will 
not use u-turns and detours to avoid it. So your patch is an 
improvement.
What it does not fix is the wrong navigation instruction: it tells you 
to turn right if you need to go straight forward, and if you need to 
turn left it doesn't tell you anything. And this shouldn't have anything 
to do with road speed or surface.

Beside for the tests I made sure that road speed and everything else is 
identical.

Regards,
   Thorsten

> Regards
> Ticker
> 
> On Thu, 2024-08-08 at 17:11 +0200, Thorsten Kukuk wrote:
>> Am 2024-08-08 16:52, schrieb Ticker Berkin:
>> > Hi
>> >
>> > First of all did you have these values in AngleChecker
>> >   COMPACT_DIR_DEGREES = 45+1;
>> >   SHARP_DEGREES = COMPACT_DIR_DEGREES;
>> > If SHARP_DEGREES is less than this, then, with compactDir format, there
>> > might
>> > not be big enough distinction between the directions of the 2 exit ways
>> > to get
>> > the correct turn instruction.
>> 
>> Yes, I haven't changed them. I'm using mkgmap r4921 with your patch.
>> 
>> > Your second example isn't quite clear; there are 3 3-way junctions near
>> > the
>> > coords you gave, and, for one of them, the continuous way bends with
>> > the other
>> > way, starting at the node, almost straight on going south. Without
>> > loading these
>> > nodes and checking all the initial headings I can't tell which angles
>> > are
>> > "sharp" and AngleChecker doesn't do anything if there are no sharp
>> > angles.
>> 
>> The point is https://www.openstreetmap.org/node/261582603
>> The ways are https://www.openstreetmap.org/way/24147681 and
>> https://www.openstreetmap.org/way/24147729
>> 
>> Thorsten
>> _______________________________________________
>> mkgmap-dev mailing list
>> mkgmap-dev at lists.mkgmap.org.uk
>> https://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev
> 
> _______________________________________________
> mkgmap-dev mailing list
> mkgmap-dev at lists.mkgmap.org.uk
> https://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev