On Wed, 16 Feb 2005, Latimer, S wrote:
> Robb,
>
> Thanks for all of your help. The netCDF converter works very well.
> I now have a problem with extracting the data in the netCDF format.
> We (my advisor and I) tried to access the netCDF model file using
> IDV and it displays fine. The only problem is that I am attempting
> to obtain u,v wind components at several levels above discrete points
> (i.e. lat, lon). The hope is that if we resolve the projection scheme
> (Lambert Conformal) we would be able to automatically extract the data
> by use of Matlab.
> We have tried to look at various equations in Holton (not helpful)
> and other sources (Penn. state, somewhat helpful) that in essence
> describe
> variables like true latitude, longitude, etc. with several complex
> equations
> describing how a grid point is located on the map at a particular
> location.
> My advisor also tried something called the "Great Circle calculator"
> (method found at this website
> http://www.meridianworlddata.com/Distance-Calculation.asp)
> and found that the grid does not appear to have a "regular grid spacing"
> in terms of distance, nor does it appear to be laid out using a perfect
> "E-W" orientation.
> Do you know (or know someone who might) what or how we can possibly
> extract
> from discrete points the u, v wind components from several levels data,
> given this problem or issue?
Stephen,
that's a tough question. the idv does the conversions at a lower level
so you really don't have access to the routines to request values of
particular lat/lon locations. when you display the data, can't you get the
values over particular lat/lon location by placing the cursor over the
location? if it's more than a few points, this would be hard. there is a
s/w package called MyWorld that may help you, url:
http://www.worldwatcher.northwestern.edu/myworld/
robb...
> Thanks again for your help.
>
> Stephen Latimer
> Meteorology Graduate Student
> Texas Tech University ATMO
> Lubbock, TX 79409
>
==============================================================================
Robb Kambic Unidata Program Center
Software Engineer III Univ. Corp for Atmospheric Research
rkambic@xxxxxxxxxxxxxxxx WWW: http://www.unidata.ucar.edu/
==============================================================================
