2012/8/27 Ian Sergeant <[email protected]> > The first real divergence I've come across is here, where the ABS > border follows the northern anabranch, but it seems clear from AGRI > that the southern watercourse is now the one with the most flow. I'd > like to declare this land as part of NSW. > > > http://agri.openstreetmap.org/?zoom=16&lat=-36.0233&lon=146.67105&layers=B00 >
Sounds reasonable to me. In fact I also came across the first cut-offs over the weekend, an example is [1]. But I found it rather difficult to decide for one state or the other. According to [2] (page 2) the border does not necessarily change if the river does: "The creation of a new channel after 1850 by sudden avulsion will not alter the location of the state border. [...] The rule of gradual and imperceptible erosion and accretion will apply." So I let Victoria win there, even though I don't have any data from 1850 available.... Best regards, Michael ---------- [1] http://agri.openstreetmap.org/?zoom=15&lat=-34.66479&lon=142.50166&layers=B00 [2] http://www.dse.vic.gov.au/__data/assets/pdf_file/0004/104377/NSW-VIC_Border_Determination.pdf
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