data transformation questions

[Don Murray]

Hi Stuart-

Stuart Maclean wrote:
> I did try the geosubsetting in idv 1.3b2, but it didn't quite do what I 
> needed.  My subgrid is actually defined by grid points, or equivalently, 
> kilometers, rather than lat lon as catered for by IDV.  My grid has a 
> lambert conformal projection from x,y to lat,lon.  So I completed a nice 
> netcdf filter app which takes index ranges for coordinate variables and 
> uses Array.section to dice up the data.

We'll think about row/column subsetting to the spatial subsetting
panel for a future release.  The underlying GeoGrid API supports
this, we just haven't exposed it to the user.

> Also, in trying to display my data (wind speed) in IDV as knots rather 
> than ms-1, I don't see a 'Change Display Unit' in the Edit menu of the 
> display control  (I tried all three Plan Views with same result).  The 
> User's Guide mentions that 'Some displays allow you to change the unit 
> that is used in the display' but doesn't state exactly which ones ?

All three plan view displays are set to have that menu if the
unit is not null.  Does the netCDF variable have the unit
attribute and is it a valid unit specification?
Can you provide a copy of your file that I can take a look at?
(send me a link).

> Thanks again.
> 
> BTW if anyone is interested in my netcdf filter app, i can post it.

I'd be interested.

Don
*************************************************************
Don Murray                               UCAR Unidata Program
dmurray at unidata.ucar.edu                        P.O. Box 3000
(303) 497-8628                              Boulder, CO 80307
http://www.unidata.ucar.edu/staff/donm
*************************************************************


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