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extract coastline data from etopo20
hi,
I am trying to extract coastline data from etopo20. What I need is a series of pairs longitude
and latitude to form a cloased domain or several closed domain(including islands). Is there any
ways to get this with Ferret?
I know there is a web site of USGS providing an online extraction but their data is just too
much detailed and the segments are too many.
Any suggestions appreciated.
Jiang
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