[mkgmap-dev] Inter-tile routing now available in trunk

Sat Feb 28 15:40:37 GMT 2009

Paul schrieb:
> Johann Gail wrote:
>   
>>
>>     
>>>> I've tried now with r942 on a etrex and seen the following:
>>>>
>>>> Crossing S/N borders seems to be no problem, routing gives more or less
>>>> reasonable routes.
>>>>
>>>> Crossing E/W borders doesn't work ok, as described by others too. In my
>>>> case it alway finds a route, but the route is really not optimal. The
>>>> inter tile crossing always takes place at a highway or a secondary one,
>>>> even if start and destination are only a few kilometers appart and far
>>>> from a highway.
>>>>
>>>> My impression is, that routing on E/W borders doesn't work at all, but
>>>> takes place at the basemap instead.
>>>>     
>>>>         
>>> I've removed the basemap from my 605 and have the same East/West
>>> problems so I can't see how it can be doing that. As I've already
>>> commented what I saw was that when routing east I would be directed
>>> along primary roads until I'd crossed the tile boundary (I didn't
>>> measure this exactly but it was close) and then directly to the motorway
>>> after which the given route was what I would have chosen myself
>>>   
>>>       
>> Ok, the difference may then be only the road type primary one. As all
>> primarys are in the basemap too, it is hard to distinguish.
>>     
> It's time to eat humble pie. I managed to create a single tile with all
> the places and roads on that I've been testing and this chooses exactly
> the same route as the inter-tile file. It seems it was just a
> coincidence that the routes hit the motorway around the tile boundary.
>
>   
I cant believe that, but will experiment with it later.

In my case I choose start and end left and right from the border, with a 
distance of only a few km. The next primary road is about 15km away.
I cant believe, that it is only a matter of optimization, as there is 
nearly a straight connection (lower order) between the two places.

I will try to get this area in a single tile and see what happens.

> I'm currently experimenting with different options for motorway speed
> and primary road class and speed as the routes being selected are (for
> me anyway) far from optimal
>
>   
In general i can admit, that the choosen routes are not always optimal 
but at least reasonable.