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Re: high resolution coastlines

Thanks for the pointer, Mark, and Liam too, vicariously.

For fun, here are some related links:

WVS Coastline Extractor: http://crusty.er.usgs.gov/coast/getcoast.html
Bathymetry Extractor:


Juliet G. Greenwood
Senior Programmer
Oceanweather Inc.

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Mark Hadfield <m.hadfield@niwa.cri.nz> wrote in message
> Julie Greenwood <julieg@NOSPAMoceanweather.com> wrote in message
> news:saoivr6q2pd44@corp.supernews.com...
> > Hello Everybody
> >
> > I wonder if anyone has adapted the World Vector Shoreline or something
> > similar for use with IDL.  I find the 'hires' coastlines included with
> > to be deficient for my needs.
> Me too.
> Don't bother with the World Vector Shoreline, get the Global
> Self-consistent, Hierarchical, High-resolution Shoreline Database:
> http://www.ngdc.noaa.gov/mgg/shorelines/gshhs.html
> It's a group of shoreline datasets at several different resolutions, based
> on WVS and other datasets, but cleaned up (intersecting segments removed
> etc):
> I mentioned this on the group in December and got a reply from Liam Gumley
> who has done some work on reading & displaying this dataset. Part of his
> message is included below my signature.
> ---
> Mark Hadfield
> m.hadfield@niwa.cri.nz  http://katipo.niwa.cri.nz/~hadfield/
> National Institute for Water and Atmospheric Research
> PO Box 14-901, Wellington, New Zealand
> *** Excerpt of message from Liam Gumley ***
> I've played around with converting this dataset to IDL coastline format,
> because as you've noted, the IDL coastline data is not too flash. I've
> put the relevant files online, feel free to grab any or all of them:
> (ftp://origin.ssec.wisc.edu/pub/gumley/IDL/gshhs/)
> gshhs_frames.xdr -> a saved frame file that you can display with
> (http://cimss.ssec.wisc.edu/~gumley/frame.html)
> It shows the difference in quality between the IDL coastline and the
> GSHHS coastline data off the tip of Florida.
> gshhs_to_idl.pro -> a procedure for converting GSHHS format to IDL map
> format.
> map_con.pro -> a modified version of map_continents.pro which uses the
> coastline data derived from GSHHS. It works in quite a few cases, but in
> some cases it failed to draw the coastlines properly (I think Africa had
> some problems).
> phigh.dat, phigh.ndx -> GSHHS data converted to IDL format (used by
> map_con).