[Sea-mat] vertical datum conversion?

[Rich Signell]

Zizang,

It's unfortunate that the VDATUM binary regional data files (e.g.
mlw.gtx, mllw.gtx) are not NetCDF.  Could this be considered for a
future release?   It would be convenient if the NetCDF data files
contained both the unstructured grid data and the connectivity array
to describe the topology.

Thanks,
Rich

On Fri, Feb 27, 2009 at 8:20 AM, zizang.yang <Zizang.Yang at noaa.gov> wrote:
>
> Mark -
>
>   You may want to check the NOAA VDATUM transformation tools at
> http://vdatum.noaa.gov/welcome.html.
>
> Zizang
>
> Rich Signell wrote:
>>
>> 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
>>
>>
>



-- 
Dr. Richard P. Signell   (508) 457-2229
USGS, 384 Woods Hole Rd.
Woods Hole, MA 02543-1598