FW: NARR Dataset Zooming into specific region

Rick,

These are the values.

float gridlat_221 ( gridx_221, gridy_221 )
         corners : ( 1, 0.8972797, 46.35283, 46.63458 )
         long_name : latitude
         grid_description : AWIPS - Regional - NOAMHI - High Resolution North American Master Grid (Lambert Conformal)
         units : degrees_north
         mpLambertMeridianF : 253
         mpLambertParallel2F : 50
         mpLambertParallel1F : 50
         mpProjection : LAMBERTCONFORMAL
         Dy : 32463.41
         Dx : 32463.41
         Lov : 253
         Lo1 : 214.5
         La1 : 1

      float gridlon_221 ( gridx_221, gridy_221 )
         corners : ( -145.5, -68.31888, -2.567342, 148.6397 )
         long_name : longitude
         grid_description : AWIPS - Regional - NOAMHI - High Resolution North American Master Grid (Lambert Conformal)
         units : degrees_east
         mpLambertMeridianF : 253
         mpLambertParallel2F : 50
         mpLambertParallel1F : 50
         mpProjection : LAMBERTCONFORMAL
         Latin2 : 50
         Latin1 : 50
         Dy : 32463.41
         Dx : 32463.41
         Lov : 253
         Lo1 : 214.5
         La1 : 1

Jane Okalebo
PhD student
HPRCC, School of Natural Resources
University of Nebraska-Lincoln
249 Hardin Hall
3310 Holdrege,
Lincoln, Nebraska 68583-0749 U.S.A.

________________________________
From: Rick Brownrigg [brownrig@ucar.edu]
Sent: Wednesday, September 05, 2012 12:06 PM
To: jokalebo@huskers.unl.edu
Cc: ncl-talk@ucar.edu
Subject: Re: NARR Dataset Zooming into specific region

Hi,

I don't know for certain, but I am curious about the actual values used in:

    res@mpProjection = "LambertConformal"
    res@mpLambertParallel1F = lat2d@mpLambertParallel1F
    res@mpLambertParallel2F = lat2d@mpLambertParallel2F
    res@mpLambertMeridianF = lat2d@mpLambertMeridianF

In particular, the first plot looks like the value for mpLambertMeridianF is something considerably to the west. What happens if you make it something like the center of your zoom window?

Hope that helps…
Rick

On Sep 5, 2012, at 12:50 PM, jokalebo@huskers.unl.edu<mailto:jokalebo@huskers.unl.edu> wrote:

Dear Sir/Madam,

I have modified the narr_3.ncl to read precipitation from grib files from NARR.

However, I am having difficulties zooming in on Nebraska (Latitude 39 N to 45 N and Longitudes 95 W to 104 W). The diagrams that I obtain do not appear correct.

Please see the pdf attached.

Kindly assist me. Should I use overlay?

I have also tried using the solution I found online but have been struggling for a week now.

Hi David,
>>> Yes, you should be able to overlay contour plots, NARR (w/2D lats/lons)
>>> or otherwise. Can you send the group the code you are using?
>>>
>>> One thing to watch for: Make sure the 2nd plot going into overlay is not
>>> a "_map" plotting function. For instance, if the first plot was created
>>> with this:
>>> plot = gsn_csm_contour_map(wks,data,res)
>>>
>>> then the second plot should be created with gsn_csm_contour:
>>> plot2 = gsn_csm_contour(wks,data2,res)
>>> overlay(plot,plot2)
>>>
>>> Adam

Please find the narr_3.ncl code that I am trying to use.

Jane Okalebo
PhD student
HPRCC, School of Natural Resources
University of Nebraska-Lincoln
249 Hardin Hall
3310 Holdrege,
Lincoln, Nebraska 68583-0749 U.S.A.

<test.pdf><test.ncl>_______________________________________________
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Received on Wed Sep 5 13:44:26 2012