[OSM-talk] Osmosis/Mkgmap: Missing ways at tile borders

[Karl Newman]

I'll try to take a look at it, too, and see if I can reproduce the problem.

Karl

On Thu, Apr 3, 2008 at 3:49 AM, Brett Henderson <brett at bretth.com> wrote:

> Hi Christian,
>
> This does sound strange, the completeWays functionality should avoid the
> problem you're seeing.  Can you provide me the id of the way that is
> causing you problems?  I'd like to replicate this bug if possible.
>
> If it turns out to be a limitation of the current design (ie. not easily
> fixable) then there's a backup plan.  I've finished writing a new
> bounding box implementation which might fix your problems.  It uses a
> PostgreSQL database with PostGIS extensions to perform true spatial
> queries.  It is *supposed* to avoid these types of problems but I
> haven't tested it well yet.  This sounds like a good test case.
>
> It might take me a few days to get back to you on this though, I'm away
> for the next few days.
>
> Brett
>
> Christian Linder wrote:
> > I am using a Garmin 60CSx handheld. As you suggested, I looked at the
> > tiles in JOSM. The problem is the same:
> >
> > In the original osm file, the way is contiguous:
> >
> > -------
> >
> > I call osmosis with something like
> >
> > bzcat ~/Desktop/germany.osm.bz2 | java -Xmx512M -jar
> > ~/osm/osmosis/osmosis.jar --rx file=/dev/stdin enableDateParsing=no
> > --tee 2 --bb left=8 right=9 bottom=50.9 top=51 completeWays=yes
> > completeRelations=yes --bb left=8 right=9 bottom=51 top=51.1
> > completeWays=yes completeRelations=yes --wx e008n50-e009n51.osm --wx
> > e008n51-e009n52.osm
> >
> > This gives me two tiles, but right at the border between the two tiles
> > (at 51 degree north), there is one segment missing as one tile
> > contains only data north of the border, the other contains only data
> > south of the border:
> >
> > --- ---
> >
> > I reproduced it with different tiles several times, and when I
> > download the german states from Geofabrik
> > <http://download.geofabrik.de/osm/europe/germany/> and try to
> > concatenate them to one map for the whole of germany, it is the same
> > problem.
> > So I am kind of confident it is not me doing something wrong.
> > Any suggestions?
> >
> >
> > 2008/4/2, Karl Newman <siliconfiend at gmail.com
> > <mailto:siliconfiend at gmail.com>>:
> >
> >     On Wed, Apr 2, 2008 at 6:24 AM, Christian Linder
> >     <christian.linder at gmail.com <mailto:christian.linder at gmail.com>>
> >     wrote:
> >
> >         Hi everybody,
> >
> >         I am trying to split osm data into 1x1 degree tiles with
> >         OSMOSIS, then I want to use MKGMAP to create maps for GARMIN
> >         devices, assembled from these tiles. Although I use the flags
> >         "completeWays=yes" and "completeRelations=yes" in OSMOSIS,
> >         there are always some segments missing right at the border
> >         between tiles if I look at the map on my GARMIN device. Before
> >         I investigate further, does anyone happen to know about this
> >         issue, and wether it is a problem of OSMOSIS, MKGMAP or the
> >         GARMIN device?
> >
> >         Best regards
> >         Chrischan
> >
> >
> >     I wrote the "completeWays" and "completeRelations" addition for
> >     Osmosis. I'm not aware of any problem with it. Try loading the
> >     resulting tile into JOSM to see what's going on. Also, which
> >     Garmin device are you using? I'm not aware of any issues with the
> >     handheld variety, but the Nuvi, etc. work just a bit differently
> >     and it's possible that's where the problem lies.
> >
> >     Karl
> >
> >
> > ------------------------------------------------------------------------
> >
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