Re: wmbarb not working with Lambert Conformal projection

From: <antti.pessi_at_nyahnyahspammersnyahnyah>
Date: Fri Apr 08 2011 - 13:00:50 MDT

Hi Adam,

Yes, that is exactly what I was after. That solved the problem (but
still wondering why wmbarb did work with a non-Lambert map?)

Thanks a lot,
Antti

-----Original Message-----
From: ncl-talk-bounces@ucar.edu [mailto:ncl-talk-bounces@ucar.edu] On
Behalf Of Adam Phillips
Sent: Friday, April 08, 2011 12:07 PM
To: ncl-talk@ucar.edu
Subject: Re: wmbarb not working with Lambert Conformal
projection

Hi Antti,
I ran the script you downloaded to our ftp site, and got it to work by
using wmbarbmap. (You do want to use wmbarbmap as opposed to wmbarb when

drawing wind barbs over a map.)

The key is, wmbarb's inputs are (wks,x,y,...) while wmbarbmap's inputs
are (wks,lat,lon,...)

Thus when I changed this:
wmbarb(wks, lon, lat, u, v)
to this:
wmbarbmap(wks, lat, lon, u, v)

I got the attached plot. Hopefully this is what you were after.. Adam

On 04/06/2011 05:55 PM, antti.pessi@vaisala.com wrote:
> Rick,
>
> Good catch, but I checked the "Lov" values and they are the same in
both
> variables lat2d and lon2d. So the problem is still there...
>
> Antti
>
>
------------------------------------------------------------------------
>
> *From:*Rick Brownrigg [mailto:brownrig@ucar.edu]
> *Sent:* Tuesday, April 05, 2011 1:47 PM
> *To:* Pessi Antti ANPE
> *Cc:* ncl-talk@ucar.edu
> *Subject:* Re: [ncl-talk] wmbarb not working with Lambert Conformal
> projection
>
> Hi,
>
> A central meridian in the Lambert projection is a line of constant
> *longitude*. The assignment below suggests its being set to a value of
> latitude -- is this perhaps the issue?
>
> Rick
>
> On Apr 5, 2011, at 11:51 AM, antti.pessi@vaisala.com
> <mailto:antti.pessi@vaisala.com> wrote:
>
>
>
> Hello,
>
> I'm trying to plot observed wind barbs using wmbarb on a gridded model
> map. My map resources are following:
>
> res1@mpProjection = "LambertConformal"
>
> res1@mpLambertParallel1F = lat2d@Latin1
>
> res1@mpLambertParallel2F = lat2d@Latin2
>
> res1@mpLambertMeridianF = lat2d@Lov
>
> res1@mpLimitMode = "Corners"
>
> res1@mpLeftCornerLatF = lat2d@corners(0)
>
> res1@mpLeftCornerLonF = lon2d@corners(0)
>
> res1@mpRightCornerLatF = lat2d@corners(2)
>
> res1@mpRightCornerLonF = lon2d@corners(2)
>
> res1@tfDoNDCOverlay = True
>
> If I comment out the first four lines, the wmbarb works just fine and
> plots the barbs correctly. However, that way I get a distorted map
with
> straight latitude and longitude lines. If I run the code as above,
> wmbarb doesn't plot anything. I tried wmbarbmap as well but that
didn't
> work either.
>
> Are there some settings that would make the wmbarb to work with
Lambert
> projection?
>
> Thanks,
>
> Antti Pessi
>
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-- 
__________________________________________________
Adam Phillips 
asphilli@ucar.edu
National Center for Atmospheric Research   tel: (303) 497-1726
Climate and Global Dynamics Division         fax: (303) 497-1333
P.O. Box 3000				
Boulder, CO 80307-3000    http://www.cgd.ucar.edu/cas/asphilli
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Received on Sat Apr 9 05:01:07 2011

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