[mkgmap-dev] Problem with splitter

Mon Mar 12 04:56:26 GMT 2012

Hi Wolfgang,

I'll try to find a solution once the remaining problems in the performance branch are solved.

Gerd

> Date: Mon, 12 Mar 2012 00:14:42 +0100
> From: wolfgang.hammel at gmx.de
> To: mkgmap-dev at lists.mkgmap.org.uk
> Subject: Re: [mkgmap-dev] Problem with splitter
> 
> Hi,
> 
> yes you are right, this is a splitter problem which
> is already known.
> 
> As you can see in your example, the lake is split in a way that requires it
> to be split more than once along the bounding rectangle.
> 
> see : http://www.mkgmap.org.uk/pipermail/mkgmap-dev/2011q3/012119.html
> and http://www.mkgmap.org.uk/pipermail/mkgmap-dev/2011q3/012120.html
> 
> This prob. may occur, when the polygon to be split has more than two 
> intersections with the bounding
> rectangle and consists of some ways that have all their nodes outside 
> the clipping rectangle.
> As lakes and riverbanks may have curved outlines this can occasionally 
> occur when the
> bounding rectangle intersects the polygon in a way such that the clipped 
> polygon falls into more than one
> (or probably two) parts.
> 
> I usually take the following manual procedure to circumvent the problem 
> when it occurs.
> 
> 1. Run Tile splitter once and create a map
> 2. check the map for floodings along large riverbanks or lakes
> 3. edit the file areas.list (back up the original one createt by splitter)
>      in order to move the border of the tiles away from the offending 
> riverbank or lake.
>     But take care: you have to modify the corner coordinates of at least two
>    areas in a consistent way in order to get a map without holes
>    The modification of the coordinates should be done in multiples of 0x800.
> 3a. If needed you can visualize the splitting rectangles when you use 
> the --write-kml option in step 1
>        paste the complete contents of the generated kml-file here: 
> http://display-kml.appspot.com/
> 4. rerun splitter using the option --split-file=<edited areas.list>
> 5. I use the same edited areas.list later again after I have downloaded 
> new OSM-data
>     so this manual procedure has to be done only once for a certain area
> 
> Maybe someone has enough time to enhance TileSpltter, I unfortunately 
> don't have at the moment.
> 
> But anyhow: All those working on splitter and mkgmap are doing a great 
> job. Thank you!
> 
> Wolfgang
> 
> 
> Am 11.03.2012 22:16, schrieb Martin:
> > Looks like a coastline-problem.
> > Which parameter you use for mkgmap?
> >
> > //Martin
> >
> > Am 11.03.2012 um 22:10 schrieb GerdP:
> >
> >> Hi Matteo,
> >>
> >> can you please describe the problem and what it is that
> >> makes you believe that this is a splitter problem?
> >>
> >> Gerd
> >>
> >>
> >> Matteo Gottardi-2 wrote
> >>> Hi, I noticed a problem splitting the geofabrik pbf extract of Italy
> >>> using the standard splitter-r200 options.
> >>>
> >>> The area is at http://osm.org/go/0CmXpRz , and at
> >>> http://www.gomatteo.net/10.jpg you can see how it look in
> >>> QlandkarteGT.
> >>>
> >>> The osm data seem ok, is a splitter problem?
> >>> _______________________________________________
> >>> mkgmap-dev mailing list
> >>> mkgmap-dev at .org
> >>> http://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev
> >>>
> >>
> >> --
> >> View this message in context: http://gis.19327.n5.nabble.com/Problem-with-splitter-tp5555886p5555911.html
> >> Sent from the Mkgmap Development mailing list archive at Nabble.com.
> >> _______________________________________________
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> >>
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