Reduce number of Table A
entries.
Previously, Table A entries were unique for each combination of start node,
end
node and RoadDef. But no information from the start and end nodes goes
into
Table A so we can ignore the start and end nodes and all roads
within
a given routing centre that use the same RoadDef can now share a
Table
A entry. This reduces the number of entries required which makes
the
.img files smaller and, hopefully, also improves the routing because
routing centres can now cover a larger area.
I have tested this with
mapsource and on a Nuvi and it appears to work
OK but it really needs
more testing before it could be considered for
committing.
So, all feedback is
welcome regarding the effect this patch has on
routing performance. With
the patch, the routing changed and I thought
it was more sensible but
perhaps that's just wishful thinking.
My GB map shrunk from 180
to 174 Mb with this patch.
The Nuvi calculated a
route from Lands End to Thurso (800+ miles and quite a few tiles) in no more
than 10 seconds.
Cheers,
Mark
Hi Mark,
Up to now I've just been following the discussions without any
participation,
since I am IT-challenged, and just barely understand.
But now you touch a subject close to my heart.
I MkGMap Southern Africa for my nuvi200W.
Making
I can approve slightly by increasing
--remove_short_arcs=50, but that
distorts the map :(
Making SA in 2 tiles routing capability reduces to approx. 700km (435m)
roughly half?
I would dearly love to try this patch,
But I don't even have a slight clue how to apply a patch.
Is there a simple tutorial available somewhere that is suitable for
realy simple-minded non-techs?
Or is there a way that someone can apply the patch and make it
available for people like me
(although I feel like the only non-tech around and in that case its
propably too much trouble;(
Anyway if someone would take the time to either explain (in very simple
and precise terms)
or apply the patch for me I would gladly test it.
If not, then I will very impatiently wait for the changes to be
comitted.
Thanks for all the hard work you guys put into this project.
I enjoy it tremenduously.
Groete
BennieD
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