Hi, 2012/8/31 Michael Krämer <ohr...@gmail.com>
> 2012/8/31 Ian Sergeant <inas66+...@gmail.com> > >> >> 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
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