Re: Lambert Conformal Grid

From: Rick Brownrigg <brownrig_at_nyahnyahspammersnyahnyah>
Date: Wed Aug 28 2013 - 13:31:13 MDT

Hi,

I don't know about the source of the error message, but what strikes me is the value for mpLambertMeridianF is somewhat unusual for a map of CONUS: a value of -125 puts the center of projection off the coast of California. A value of -98 would be more typical.

Just FWIW
Rick

On Aug 28, 2013, at 1:21 PM, Agnes Lim Huei Ni <alim@ssec.wisc.edu> wrote:

> Hi,
>
> I have a grb file that contains temperature covering CONUS and part
> south america.
> I had set the following resources to plot it on a lambert conformal grid
> res@mpProjection = "LambertConformal"
> res@mpLambertParallel1F = 20.000
> res@mpLambertParallel2F = 40.000
> res@mpLambertMeridianF = -125.000
> res@gsnMaskLambertConformal = True
>
> The following errors appear
> (0) mask_lambert_conformal: warning: you are not authorized to specify.
> (0) a maxlat that is above the equator and a minlat that is below
> (0) the equator. No masking will take place.
>
> The information in the grb file for T, latitude and longitude in the
> data file are listed belowe.
>
> Please advice.
>
> Thanks
> Agnes
>
> Variable: anal_T
> Type: float
> Total Size: 479364732 bytes
> 119841183 values
> Number of Dimensions: 3
> Dimensions and sizes: [lv_HYBL0 | 99] x [g3_x_1 | 869] x [g3_y_2 | 1393]
> Coordinates:
> lv_HYBL0: [1..99]
> Number Of Attributes: 13
> center : US National Weather Service - NCEP (WMC)
> long_name : Temperature
> units : K
> _FillValue : 1e+20
> coordinates : g3_lat_1 g3_lon_2
> level_indicator : 109
> gds_grid_type : 3
> parameter_table_version : 2
> parameter_number : 11
> model : North Pacific Hurricane Wave Model
> forecast_time : 0
> forecast_time_units : hours
> initial_time : 05/24/2008 (00:00)
>
> Variable: lat2d
> Type: float
> Total Size: 4842068 bytes
> 1210517 values
> Number of Dimensions: 2
> Dimensions and sizes: [g3_x_1 | 869] x [g3_y_2 | 1393]
> Coordinates:
> Number Of Attributes: 11
> corners : ( -8.035, -5.586509, 42.22018, 36.89176 )
> long_name : latitude
> GridType : Lambert Conformal Secant or Tangent, Conical or bipolar
> units : degrees_north
> Latin2 : 36.228
> Latin1 : 36.228
> Dy : 7920
> Dx : 8774
> Lov : -122.246
> Lo1 : -168.719
> La1 : -8.035
>
> Variable: lon2d
> Type: float
> Total Size: 4842068 bytes
> 1210517 values
> Number of Dimensions: 2
> Dimensions and sizes: [g3_x_1 | 869] x [g3_y_2 | 1393]
> Coordinates:
> Number Of Attributes: 11
> corners : ( -168.719, -80.83456, -45.67911, 154.7749 )
> long_name : longitude
> GridType : Lambert Conformal Secant or Tangent, Conical or bipolar
> units : degrees_east
> Latin2 : 36.228
> Latin1 : 36.228
> Dy : 7920
> Dx : 8774
> Lov : -122.246
> Lo1 : -168.719
> La1 : -8.035
>
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Received on Wed Aug 28 13:31:25 2013

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