[OSM-talk-nl] [OSM-dev] conversion AND data
marc at kessels.name
Sun Jul 29 21:39:35 BST 2007
latest version (v5) is online at http://www.kessels.name/and2osm/
this one seems to result in a proper output of the data, including all
waterways and their islands (which were causing problems see mail below
only remaining "urgent" item is that some AND nodes (~800, so about
0.05%) have more than one ID. this might give problems for one-way
streets. have to check whether this is a real problem or not.
On Sat, 2007-07-28 at 19:03 +0200, Marc Kessels wrote:
> On Sat, 2007-07-28 at 17:47 +0100, Jon Burgess wrote:
> > On Sat, 2007-07-28 at 17:55 +0200, Marc Kessels wrote:
> > > Hi Jon,
> > >
> > > thanks for your feedback. At this moment no aggregation of roads is done
> > > in my code. Apparantly that is really required for good rendering. I
> > > will start to have a look at that.
> > >
> > > I also found several bugs in the code, so please download version 3 from
> > > http://www.kessels.name/and2osm/
> > > It now also includes a bounding box, for faster conversion of a
> > > problamatic area.
> > >
> > > greetz,
> > > Marc
> > Hi,
> > I've just tried version 3. Initially I thought there was a problem
> > becuase ig genreated lots of errors and finished in a few seconds but it
> > looks like you've just got a tiny bounding box. It took me a while to
> > find the data on the map :-)
> > There is an example of where an area isn't closed properly in this data.
> > See the park in the S-W corner: leisure=park, AND=10000013. This has a
> > long N-S segment joining it to another area instead of being closed.
> > I'd be tempted to use the libavl binary tree. It should be more
> > maintainable in the long term, for an example see
> > http://trac.openstreetmap.org/browser/applications/rendering/mapnik/all_tiles/C
> > About the only thing you need to do is link against bst.[ch] and write
> > the comparison function. All the tree management and searching is taken
> > care of for you. libavl also provides other more advanced variants of
> > the binary tree which can be dropped in with just a few lines of code
> > change.
> > Jon
> well, those errors were just reminders to the things that need fixing:
> some nodes (having a ND_ID) in the AND data appear to be a way (or
> area). This would result in a problem: to which point does the ID belong
> second problem: some (lat,lon) coordinates appear as different nodes
> having a different ID, so an easy lookup is not possible for checking
> the direction of a one-way street (which is not always the direction of
> the and-shape...).
> third problem: one-way streets have to be corresponding to the from-ID
> and to-ID and not to the shape direction (requires reversing segments,
> compared to that, merging of ways is only a tiny problem...
> I have to leave now for a party, so feel free to submit a patch for the
> b-tree improvement. That was source-code I was looking for!
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