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Removed the previous links, which I should have checked more scrutinously, and found some information and shapefiles which hopefully would be of some use: The EEZ Boundaries (Exclusive Economic Zone) which for this purpose is mainly used to show the coastal lines and outlines of continents. http://www.marineregions.org/downloads.php#eez The main Global ...


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As for the second part of your question, v.build.polylines will connect line "segments", removing nodes as long as exactly two line segments are connected. All intersections with 3 or more segments will be left as nodes. I Can't help with the list of nearest neighbors.


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i) seems like nearest point analysis; it is available in ArcGIS, and in GME (search Hawths Tools (Spatial Ecology)), ii) a line clean should sort this out



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