You can get coastline data in Mapgen or Matlab format from NOAA's Coastline Extractor at http://www.ngdc.noaa.gov/mgg/shorelines/shorelines.html.
Matlab vector line maps are simply a series of "x y" data points. Lines
are separated by a row containing NaN NaN.
Output from Matlab with this command:
save filename.txt arrayname -ASCII
You can import 3D lines from Matlab by exporting a 3 column array and using the -z flag.
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