Hi Gerd,
As this new feature would be for areas.list passed to splitter, I
thought it could assign objects to tiles (inlcuding L-shaped ones) in
one step, assuming it can do so once it knows the area of each tile, but
I'm probably wrong, as I don't really know how splitter works internally.
Right/left hand drive side driving is quite difficult to solve in land
borders, but L-shaped tiles can help avoiding the need of tiny tiles in
those areas. For areas with a lot of islands, where some drive on the
right and others on the left, L-shaped tiles would really help.
El 6/12/23 a las 12:23, Gerd Petermann escribió:
Hi Carlos,
since nobody else reacted:
I wonder in what situation an L-shaped tile could be the result of a
split-process.
Do you think about some kind of post-processor which would recombine 2 or more
tiles so that they still don't
reach the maxnodes boundary? Thinking about the way how a split is done, I
think it can happen that the combination of two connected tiles are still below
the limit,
but I would assume that an L-shape is rather rare.
Anyway, if splitter would write non-rectangular tiles we need
a) a further output file (or a new output format) to store the tile-boundary
for input in mkgmap
b) some new logic in mkgmap to cut ways and polygons along that boundary
It might be easier to implement b) when boundary lines are only horizontal or
vertical, but I am pretty sure this wouldn't solve most of the problems
reg. right/left hand side driving.
ciao
Gerd
________________________________________
Von: mkgmap-dev <mkgmap-dev-boun...@lists.mkgmap.org.uk> im Auftrag von Carlos Dávila
<car...@alternativaslibres.org>
Gesendet: Sonntag, 3. Dezember 2023 12:26
An: Development list for mkgmap
Betreff: [mkgmap-dev] Splitter feature request
Hi all
I usually let splitter decide tiles based on max-nodes value, but for
some maps I need to supply splitter an areas.list file which I adjust
manually. Reasons for that include reducing the total number of tiles,
avoiding cutting of some islands and separating right/left hand side
driving areas or reducing number of tiles with both sides driving. For
these cases, it would be helpful to be able to build "L shaped tiles",
as in the attached image. I think these tiles could be defined by three
coordinates (A,B,C), which would define the two rectangles in which the
L shaped tile can be split, and a switch (1,2,3,4) to determine de
orientation of the "L".
1: tile = A-lat, A-lon to B-lat, B-lon + A-lat,B-lon to C-lat,C-lon
2: tile = B-lat, A-lon to C-lat, C-lon + A-lat,B-lon to B-lat,C-lon
3: tile = A-lat, A-lon to B-lat, B-lon + B-lat,A-lon to C-lat,C-lon
4: tile = A-lat, A-lon to C-lat, B-lon + A-lat,B-lon to B-lat,C-lon
This raises several questions. First of all, if is feasible, then if it
is worth the effort to implement it, how would if affect splitter
performance and if it makes sense for other users. Perhaps it could be a
first step towards irregular tiles...
_______________________________________________
mkgmap-dev mailing list
mkgmap-dev@lists.mkgmap.org.uk
https://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev
_______________________________________________
mkgmap-dev mailing list
mkgmap-dev@lists.mkgmap.org.uk
https://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev
