[Sea-mat] vertical datum conversion?

[Xu, Zhigang]

Hello Mark

Have you got a Matlab toolbox for conversions of vertical datum? If so, may I shear it? 

Zhigang Xu

Research Scientist 
Modelling and Operational Oceanography 
Canadian Hydrographical Service 
Quebec Region 
Fisheries and Oceans Canada 
Maurice Lamontagne Institute 
850, route de la Mer, P.O. 1000 
Mont-Joli (Qc), CANADA G5H 3Z4 
Tél.: (418) 775-0776 Fax.: (418) 775-0654 


-----Original Message-----
From: sea-mat-bounces at whoi.edu [mailto:sea-mat-bounces at whoi.edu] On Behalf Of Rich Signell
Sent: February 27, 2009 7:23 AM
To: Prater, Mark
Cc: Zizang Yang; Edward Myers; sea-mat at whoi.edu
Subject: Re: [Sea-mat] vertical datum conversion?

Mark,

I don't know of any general Matlab tool to do this, but you should be able to obtain the VDATUM conversion grids in NetCDF format from the
VDATUM folks (Ed Myers and Zizang Yang at NOOA).   These are triangle
based grids, generally from ADCIRC, that can then be interpolated in Matlab using triterp.m or other methods.  We used this Matlab-based approach in the Gulf of Maine to convert all MLLW and MLW soundings to
MSL.     I'm cc'ing Ed and Zizang on this, as they might have a
different solution (or correct me if I'm wrong!)

-Rich

On Thu, Feb 26, 2009 at 9:43 AM, Prater, Mark <mdp at weatherpredict.com> wrote:
> Hi all,
>
> I'm looking for a function (or Toolbox) that could convert elevations 
> between various vertical datum used in the US, such as NGVD29, NAVD88, 
> MSL, MLLW, etc.   I know there are several packages available from 
> NOAA (VERTCON and VDatum) that do this, and I may end up using them, 
> but a Matlab equivalent would streamline my life.
>
> Any suggestions?
>
> Thanks,
>
>  -- Mark
>
> ____________________
>
> Mark Prater
> Research Analyst
> WeatherPredict Consulting
> 919-239-8829 (Direct)
> 401-788-9031 (Local)
>
>
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-- 
Dr. Richard P. Signell   (508) 457-2229
USGS, 384 Woods Hole Rd.
Woods Hole, MA 02543-1598

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