Hi I have noticed that in Devonport Tasmania the coastline has appeared with reference ABS-2006 along with an area called beach. It can be a little out so just curious what level of detail/accuracy is this and worthwhile better aligning it. Also am I correct to assume that it is the high water mark? Cheers Brett
> From: [email protected] > Date: Tue, 18 Sep 2012 09:34:46 +1000 > To: [email protected] > CC: [email protected]; [email protected] > Subject: Re: [talk-au] National borders (was: import of state borders?) > > Hi, > > If I understand correctly, the differences should only correspond to > the amount that our coastline differs from the low water mark? Are we > missing parts of the true coastline, is our coastline just inaccurate > do you think? > > I'd be surprised if there was any definitive low water mark data for > the entire coastline. > > Should we start with a simpler section, like NSW? > > Ian. > > On 12 September 2012 23:04, Michael Krämer <[email protected]> wrote: > > Hi, > > > > 2012/8/31 Michael Krämer <[email protected]> > >> > >> 2012/8/31 Ian Sergeant <[email protected]> > >>> > >>> > >>> Well, I think the baseline is defined here.. > >>> > >>> http://www.comlaw.gov.au/Details/F2006L00525 > >>> > >>> I don't think we have any issues using those facts as a source. > >> > >> > >> That looks great, combining this with the coastline should work. The > >> coastline can be either drawn via osmosis from a planet extract or perhaps > >> also from OverpassAPI. But I guess we'll have to generate all those line > >> segments in QGIS to get the coordinate systems right. > > > > > > A quick update from my side on this: I'm afraid it's not as straightforward > > as I had assumed... > > > > I managed to generate an osm file from the points given in the proclamation > > [1]. This gives the straight pieces of the baseline. But the problem is that > > the coastline doesn't really give the right baseline for the rest (high vs. > > low water mark). When I checked briefly I came across some pronounced > > differences for example in the gulf of carpentaria. I guess it will be the > > same along the Great Barrier Reef. > > > > So we would have to do some guesswork to combine coastline and straight > > segements. > > > > BTW, it's very likely not a projection issue. I made sure by doing a check > > of my calculations against the data Geoscience Australia provides. > > > > Michael > > > > ------- > > [1] https://dl.dropbox.com/u/1222615/baseline.osm > > _______________________________________________ > Talk-au mailing list > [email protected] > http://lists.openstreetmap.org/listinfo/talk-au
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