<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto">Hi,<div><br><div>Interesting web link. I did not follow this conversation closely but noticed it hovered between legal definitions and practical definitions like tide levels. I’am not sure anyone pointed out to UNCLOS? There is a link to it on your page. Most countries have signed it or respect it’s general principles.<br><br><div dir="ltr">Nicolas Cadieux<div><a href="https://gitlab.com/njacadieux">https://gitlab.com/njacadieux</a></div></div><div dir="ltr"><br><blockquote type="cite">Le 5 mai 2021 à 20:38, Iain@jcis.net.au a écrit :<br><br></blockquote></div><blockquote type="cite"><div dir="ltr"><meta http-equiv="Content-Type" content="text/html; charset=us-ascii"><meta name="Generator" content="Microsoft Word 15 (filtered medium)"><style><!--
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</o:shapelayout></xml><![endif]--><div class="WordSection1"><p class="MsoNormal">This is an interesting question once you get into it. In Australia it is compounded by States having their own “States Waters” as well as the Commonwealth having its own waters. I once had to deal with a shipwreck whose stern was in the State of Victoria and whose bow was in the Commonwealth. There is an interesting discussion on the Geoscience Australia site <o:p></o:p></p><p class="MsoNormal"><a href="https://www.ga.gov.au/scientific-topics/marine/jurisdiction">https://www.ga.gov.au/scientific-topics/marine/jurisdiction</a> that may be of interest as it talks also about general principals.<o:p></o:p></p><p class="MsoNormal"><o:p> </o:p></p><p class="MsoNormal">In practice I use the 0 elevation contour or shapes of the coast provided by Government Agencies.<o:p></o:p></p><p class="MsoNormal"><o:p> </o:p></p><p class="MsoNormal">Cheers<o:p></o:p></p><p class="MsoNormal"><o:p> </o:p></p><p class="MsoNormal"><b><span style="font-size:12.0pt;font-family:Papyrus;mso-fareast-language:EN-AU">Dr Iain Stuart<o:p></o:p></span></b></p><p class="MsoNormal"><b><i><span style="font-size:12.0pt;font-family:Papyrus;mso-fareast-language:EN-AU">JCIS Consultants <o:p></o:p></span></i></b></p><p class="MsoNormal"><span style="mso-fareast-language:EN-AU">P.O. Box 2397<o:p></o:p></span></p><p class="MsoNormal"><span style="mso-fareast-language:EN-AU">Burwood North<o:p></o:p></span></p><p class="MsoNormal"><span style="mso-fareast-language:EN-AU">NSW, 2134<o:p></o:p></span></p><p class="MsoNormal"><span style="mso-fareast-language:EN-AU"><o:p> </o:p></span></p><p class="MsoNormal"><span style="mso-fareast-language:EN-AU">(02) 9701 0191<br>(0413) 380116 (m)<o:p></o:p></span></p><p class="MsoNormal"><o:p> </o:p></p></div><span>_______________________________________________</span><br><span>Qgis-user mailing list</span><br><span>Qgis-user@lists.osgeo.org</span><br><span>List info: https://lists.osgeo.org/mailman/listinfo/qgis-user</span><br><span>Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user</span><br></div></blockquote></div></div></body></html>