Re: shift in wind field

Eric,

Please see attached PNG and wind_mary.ncl. Does this image look more
in line with what you expect?

It's possible that in the original script, the map projection was not
set up to exactly match the grid that the data were measured on.

Since the 2D lat/lon coordinates were available, I used these to
figure out the correct transformation, instead of assuming the map
projection was exactly right.

It does take longer to use the lat2d/lon2d method, so if you can
figure out the exact map projection, you should go this route.

I did notice that on the file it had attributes:

          grid_mapping_name : polar_stereographic

so I'm wondering if the original map projection is polar
stereographic, and not lambert conformal?

--Mary

On Thu, 19 Mar 2009 elu_at_iastate.edu wrote:

> Dear Mary,
>
> I've ftp'ed the full ncl file and the two data files:
>
> wind.ncl
> uas_ECPC_1979010103.nc
> vas_ECPC_1979010103.nc
>
> Thanks,
> Eric
>
>
>> Eric,
>> It looks like you are doing the correct steps.
>> Would it be possible for you to provide the full script and data?
>> Please go to http://www.ncl.ucar.edu/report_bug.shtml
>> and see instructions near the bottom for ftp.
>> Thanks,
>> --Mary
>>
>> On Tue, 17 Mar 2009 elu_at_iastate.edu wrote:
>>> A question for you experts:
>>> I'm plotting the wind speed field of a regional model, and find the field
> has a southeastward shift relative to the map of the region.
>>> The model projection is "polar_stereographic", and I plotted the field
>>> as "LambertConformal".
>
>
>
>

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