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| Re: high resolution coastlines [message #19069 is a reply to message #18933] |
Tue, 22 February 2000 00:00  |
Julie Greenwood
Messages: 6
Registered: December 1999
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Junior Member |
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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: http://128.160.23.42/dbdbv/dbdbv.html
Julie
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Juliet G. Greenwood
Senior Programmer
Oceanweather Inc.
JulieG@Oceanweather.com
http://www.oceanweather.com/
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Mark Hadfield <m.hadfield@niwa.cri.nz> wrote in message
news:950820600.235630@clam-55...
> 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
IDL
>> 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
> FRESTORE:
> (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).
>
>
>
>
>
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