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

Thu Feb 19 16:09:48 GMT 2009

I'm seeing very similar behaviour to this. Travelling North/South or
South/North across a boundary seems to work fine but East/West or
West/East fails. Picking North/South source/destinations I can route a
considerable distance but there is a point where I can route to a town
but not to the next town 5 miles further away. I have heard of a 13000
point limit on Garmin devices so this is possibly what I'm seeing here
as the destinations are all on the same tile. From where I am then
routing into Scotland is North/South boundary and Wales is on the same
tile so this all works fine

If I use the individual England, Scotland, Wales files rather than the
combined great_britain and combine then with mkgmap then routing into
Wales (East/West junction so would fail anyway) or Scotland
(North/South) simply fails. Is this possibly related to the way in which
the individual country files are created from the raw data. I don't have
to run splitter against Scotland or Wales but do against England

When it fails my 605 simply says "Route calculation error" and returns
me to a map of my starting location

Paul

Steve Ratcliffe wrote:
> On Thu, Feb 19, 2009 at 12:56:24AM +0000, Mark Burton wrote:
>> I appears to work fairly well in mapsource although I have found that for
>> long routes it gives up and draws a straight line even though it can route OK
>> if you add some intervening waypoints. So, more work required but it would
>> be great to get some feedback as to how it's currently performing
>> especially on real gps units.
> 
> I'm finding that crossing a vertical edge of a tile almost never works, but
> that crossing a horizontal one is fine.
> 
> So even the simplest route on the same road from west to east takes a long
> time to calculate and then ends up as a straight line or a very weird
> route.
> 
> There is one vertical boundary that seems OK.  It has positive longitude,
> whereas all the others on my mapset have negative longitudes.  So that
> may be something to do with it or just a coincidence.
> 
> ..Steve
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