<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
</head>
<body>
<div style="16px" text-align="left"><br></div><div style="16px" text-align="left"><br></div><div style="16px" text-align="left"><br></div><div style="16px" text-align="left">Apr 19, 2019, 1:59 AM by graemefitz1@gmail.com:<br></div><blockquote class="tutanota_quote" style="border-left: 1px solid #93A3B8; padding-left: 10px; margin-left: 5px;"><div dir="ltr"><div dir="ltr"><div style="16px" text-align="left"><br></div><div><div dir="ltr" class="" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><br></div></div></div></div></div></div><div class=""><div dir="ltr" class="">On Fri, 19 Apr 2019 at 07:26, Christoph Hormann <<a href="mailto:osm@imagico.de" rel="noopener noreferrer" target="_blank">osm@imagico.de</a>> wrote:<br></div><blockquote class="" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div style="16px" text-align="left">On Thursday 18 April 2019, Kevin Kenny wrote:<br></div><div style="16px" text-align="left"> > > And how do you verifiably determine if two things are part of the<br></div><div style="16px" text-align="left"> > > same physical object? <br></div><div style="16px" text-align="left"><br></div><div style="16px" text-align="left"> But as already hinted i am not sure if the Drake Passage is something i <br></div><div style="16px" text-align="left"> would consider mappable in OSM based on local knowledge. <br></div></blockquote><div><br></div><div>But, without wishing to sound facetious, how do we then have coastlines for Eurasia, Greenland & Antarctica mapped?<br></div><div><br></div><div><i>Nobody</i> has "local knowledge" of the full coastline of any of them, & for Greenland & Antarctica, what is mapped - the ice cap, which is constantly moving, or the deep underlying rock? Should we erase them off the map as they're not "verifiable"?<br></div></div></div></blockquote><div style="16px" text-align="left">Coastline can be mapped in fragments and every single part of coastline is locally verifiable.<br></div><div style="16px" text-align="left"><br></div><div style="16px" text-align="left">It is not true for objects like oceans, mountain ranges, continents etc.<br></div><div style="16px" text-align="left"><br></div><div style="16px" text-align="left">You can go to a beach and check whatever land is on one side and water on other and check<br></div><div style="16px" text-align="left">shape of a coastline.<br></div><div style="16px" text-align="left"><br></div><div style="16px" text-align="left">It is impossible to do it with border between oceans.<br></div> </body>
</html>