NJ22 and WRF data

[John Caron]

Hi Robert:

I have seen WRF files where the projection parameters are incorrectly specified. No one noticed because they only use the lat/lon (XLAT,XLON?) variables. However, interpreting the parameters  correctly is difficult. Can you send me the file (or http/ftp URL) and i'll have a look.

Robert B. Schmunk wrote:
> 
> John,
> 
> To follow up on my e-mail of a week ago, I have been able to use
> the NJ22 libraries to get into several sample WRF datasets and
> not only extract the data but also the coordinate transform
> information. Things seem to work beautifully with three different
> datasets that use Lambert conformal conic grids (centered at
> different locations), and I've even been able to doublecheck that
> by comparing plot made with my own code for the L.c.c. projection.
> 
> However, one problem I am still encountering is with a dataset
> that is on a transverse Mercator grid. The data extract and plot
> easily enough, but an eyeball check of how certain variables
> compare to coastline locations suggests that something is awry.
> See for example attached image of HGT (height) and notice how the
> Mediterranean coastline is a mess. Unfortunately, I have no idea
> whether this indicates a potential bug in NJ22 or if the dataset
> is just not gridded as the parameters claim it is gridded. Are
> you aware of any specific issues between NJ22 and WRF data on
> a transverse Mercator grid?
> 
> rbs
> 
> 
> 
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> 
> 
> 
> 
> -- 
> Robert B. Schmunk, rschmunk at giss.nasa.gov
> NASA Goddard Institute for Space Studies, 2880 Broadway, New York, NY 10025
>