>From a 'philosophical point of view', I tend to agree that suburbs are made of a set of boundaries between adjacent areas. This was not how I did it in my first (very quick) attempt ;-(
The data is in shapefiles that define each suburb boundary individually, so I'll have a think about how to extract out the individual borders (suggestions welcome) One question about aligning them that springs to mind is 'what should we align' - I wonder if the accuracy of the data is better than the average accuracy of a gps or yahoo imagery. cheers On Thu, Feb 5, 2009 at 3:39 PM, Darrin Smith <[email protected]> wrote: > On Thu, 5 Feb 2009 14:26:13 +1100 > Franc Carter <[email protected]> wrote: > > > There are two issues that I have come across with converting to osm:- > > > > 1. What way do we want to represent the data, e.g closed ways or > > relations consisting > > of borders - something else ? > > I'd personally prefer border relations. But given Franc and I seem > to be the only significant creators of relations in .au anyway (A > search of the australia.osm reveals we're the only two with > 100 > relations) I don't think the majority of regular osm mappers have got > relations yet. > > However I think relations are the way data like this is going in OSM. > > > 2. The more technical problem that the boundaries are defined > > fairly precisely (or more accurately > > there are lots of points defining the boundaries). So the .osm > > file is very large - so eyeballing > > it in josm is not going to work. > > > > So I'm interested in people's suggestions of how we want to represent > > the data and on methods we can > > use to sanity check the data before we upload it. > > Lots of the cases are along roads/rivers/railways I imagine to > make them align with what we actually have on the map, lots of review > is going to have to happen once it's actually in the map anyway. > > Given nearly all suburb boundaries are multiples (one suburb on each > side). I'd think 1 way for a common boundary between 2 suburbs and > joining up all those ways for each suburb in a relation would be the > way to go. Then people can review them in areas where there's existing > data and re-align them down the middle of roads they run along or > remove the chunks than overlap single ways and add those ways to the > boundary. > > > > > _______________________________________________ > Talk-au mailing list > [email protected] > http://lists.openstreetmap.org/listinfo/talk-au > -- Franc
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