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separate coastline (from country polygon da...   Hugo Ahlenius Jul 09, 2007
Re: separate coastline (from country polygo...   Hugo Ahlenius Jul 09, 2007
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Subject separate coastline (from country polygon dataset) 
Author Hugo Ahlenius 
Date Jul 09, 2007 
Message Hi,

I have a shape-file with country polygons (it would work similarily for other polygons) and now I want to separate it to two files, one with the coastline (outermost boundary - towards the 'universe polygon') and one with the internal country-to-country boundaries.

I know how to do this reasonably easy in ArcInfo workstation, but is there any smarter way to do this within ArcGIS? (if it involves a lot of steps - then I might as well do it in ArcInfo WS)

It would be interesting if one could do this with some smart queries or representations as well...

I doubt that it is that easy though - since the shape-file doesn't know anything about topology.

:)
 
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Hugo Ahlenius
Cartographer, GIS Analyst at Nordpil http://nordpil.com 
   
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Subject Re: separate coastline (from country polygon dataset) 
Author Hugo Ahlenius 
Date Jul 09, 2007 
Message Ok - I got a quick response at the CartoTalk forum - one just need to run the PolygonToLine toolbox tool, and observe the left/right id's - which should be -1 for universe.

http://www.cartotalk.com/index.php?showtopic=2288 
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Hugo Ahlenius
Cartographer, GIS Analyst at Nordpil http://nordpil.com