Re: Lambert Conformal Grid

From: Agnes Lim Huei Ni <alim_at_nyahnyahspammersnyahnyah>
Date: Wed Aug 28 2013 - 19:42:38 MDT

Hi Dave,

I apologist for the typo. I have put my code, the data and the figure
that i generated in the link below.

ftp://ftp.ssec.wisc.edu/pub/ssec/alim/

Thanks
Agnes

On 8/28/13 6:47 PM, David Brown wrote:
> It doesn't seem to be there:
>
> 230 Anonymous access granted, restrictions apply
> Remote system type is UNIX.
> Using binary mode to transfer files.
> ftp> cd pub/alim
> 250 CWD command successful
> ftp> ls
> 227 Entering Passive Mode (128,104,108,86,250,150).
> 150 Opening ASCII mode data connection for file list
> drwxr-xr-x 2 ftp ftp 116 Jun 14 18:31 GEO-HYPER_OSSE
> drwxr-xr-x 5 ftp ftp 12288 Aug 27 16:15 model_levels
> 226 Transfer complete
> ftp> cd GEO-HYPER_OSSE
> 250 CWD command successful
> ftp> ls
> 227 Entering Passive Mode (128,104,108,86,252,184).
> 150 Opening ASCII mode data connection for file list
> -rw-r--r-- 1 ftp ftp 231424 Apr 26 15:00 GEO-HYPER
> OSSE_exp_config.ppt
> -rw-r--r-- 1 ftp ftp 54272 Apr 26 14:54
> Geo-hyper_osse_experiment.doc
> -rw-r--r-- 1 ftp ftp 13106721 Jun 14 18:31 ectc_simcot.gif
> 226 Transfer complete
> ftp> cd ../model_levels
> 250 CWD command successful
> ftp> ls
> 227 Entering Passive Mode (128,104,108,86,213,27).
> 150 Opening ASCII mode data connection for file list
> -rw-r--r-- 1 ftp ftp 713735 Aug 27 16:20
> Inc_1st_outer_loop.pptx
> -rw-r--r-- 1 ftp ftp 3416576 Aug 21 04:01
> Model_top_vart_res_081213.ppt
> -rw-r--r-- 1 ftp ftp 17796 Mar 8 15:28 P.png
> -rw-r--r-- 1 ftp ftp 13671 Mar 8 15:28 P_zoom.png
> -rw-r--r-- 1 ftp ftp 1278464 Feb 21 2013 Vert_Res_tests.ppt
> -rw-r--r-- 1 ftp ftp 940032 Mar 9 03:44
> Vert_Res_tests_II.ppt
> drwxr-xr-x 2 ftp ftp 12288 Jun 12 03:40 airs
> -rw-r--r-- 1 ftp ftp 16505451 May 14 16:19 gsi_profiles
> -rw-r--r-- 1 ftp ftp 15446618 May 23 02:13 gsi_profiles_0.5Pa
> drwxr-xr-x 2 ftp ftp 8192 Jun 12 18:21 hirs-3
> drwxr-xr-x 2 ftp ftp 16384 Jun 13 20:24 iasi
> -rw-r--r-- 1 ftp ftp 15731 Mar 8 15:28 lnP.png
> -rw-r--r-- 1 ftp ftp 10305 Jun 10 20:18
> sigma_levels_0_0.01.png
> -rw-r--r-- 1 ftp ftp 11186 Jun 10 20:18
> sigma_levels_0_1.png
> 226 Transfer complete
> ftp> pwd
> 257 "/pub/alim/model_levels" is the current directory
>
> ======
>
> It would be helpful to have your code and the grib file as well
> (unless it's a simple fix -- but I can't tell with out the picture).
> Thanks.
> -dave
>
>
> On Aug 28, 2013, at 5:15 PM, Agnes Lim Huei Ni <alim@ssec.wisc.edu
> <mailto:alim@ssec.wisc.edu>> wrote:
>
>> Hi David,
>>
>> Thanks for clarifying what the purpose of the masking option is for.
>>
>> I have set my resource options to what you suggested but coordinates
>> still does not look right.
>> I have placed the figure at
>> ftp.ssec.wisc.edu/pub/alim/T_test.pdf
>>
>> Please advise.
>>
>> Thanks
>> Agnes
>>
>> PS The following is the code segment for the plotting.
>>
>> res@gsnSpreadColors = True
>> res@mpLandFillColor = -1 ; set land to be
>> transperant
>> res@mpOutlineOn = True
>> res@mpOutlineBoundarySets = "AllBoundaries"
>> res@mpProjection = "LambertConformal"
>> res@mpLambertParallel1F = lat2d@Latin1 ; ncl adds
>> from grib file
>> res@mpLambertParallel2F = lat2d@Latin2 ; ncl adds from
>> grib file
>> res@mpLambertMeridianF = lat2d@Lov ; ncl adds
>> from grib file
>> res@mpLimitMode = "corners"
>> res@mpLeftCornerLonF = lon2d@corners(0) ; (-168.719)
>> res@mpLeftCornerLatF = lat2d@corners(0) ; (-8.035)
>> res@mpRightCornerLonF = lon2d@corners(2) ; (-45.67911)
>> res@mpRightCornerLatF = lat2d@corners(2) ; (42.22018)
>> res@tfDoNDCOverlay = True
>> res@cnFillOn = True
>> res@cnLinesOn = False
>> res@cnLineLabelsOn = False
>> res@lbBoxLinesOn = True
>>
>> res@gsnAddCyclic = False
>> res@gsnDraw=False
>> res@gsnFrame=False
>> res@mpEllipticalBoundary = False
>> res@tmXBLabelFontHeightF = 0.01 ; resize tick labels
>> res@tmYLLabelFontHeightF = 0.01
>> res@pmTickMarkDisplayMode = "Always"
>> res@lbLabelAutoStride = True
>> res@lbLabelBarOn = False
>> res@lbLabelFontHeightF=0.012
>> res@cnLevelSelectionMode = "ExplicitLevels"
>> res@cnLevels=(/-2.0, -1.5, -1.0, -0.5, 0.5, 1, 1.5, 2.0/)
>>
>> plot(0)=gsn_csm_contour_map(wks,inc(97,:,:), res)
>> plot(1)=gsn_csm_contour_map(wks,inc(94,:,:), res)
>> plot(2)=gsn_csm_contour_map(wks,inc(91,:,:), res)
>> plot(3)=gsn_csm_contour_map(wks,inc(88,:,:), res)
>> plot(4)=gsn_csm_contour_map(wks,inc(85,:,:), res)
>> plot(5)=gsn_csm_contour_map(wks,inc(82,:,:), res)
>>
>> resP=True
>> resPgsnPanelFigureStngsPerimOn=False
>> resP@gsnPanelLabelBar = False
>> resP@lbLabelFontHeightF=0.012
>> resP@pmLabelBarOrthogonalPosF = -0.05
>> resP@lbLabelStride = 1
>> resP@gsnPanelFigureStrings= (/"a)","b)","c)","d)","e)","f)"/)
>> gsn_panel(wks, plot, (/3,2/), resP)
>> gsnMaximize = True
>>
>>
>> On 8/28/13 4:53 PM, David Brown wrote:
>>> Agnes (and Rick):
>>> Well the model this GRIB is associated with is the "North Pacific
>>> Hurricane Wave Model" so it seems natural that it is centered over
>>> the Pacific. I am attaching a plot of the area covered by the data as
>>> specified in the GRIB lat/lon coordinate attributes. As the message
>>> indicates, the error stems from attempting to mask the conformal
>>> projection. The masking routine expects the plot to lie solely in
>>> the Northern or Southern
>>> hemisphere. That is because its purpose is to remove the "hole" in
>>> the projection that occurs wrapping around the pole. See the two
>>> frames of the first plot in the masked LC example page if this is
>>> not clear (http://www.ncl.ucar.edu/Applications/lcmask.shtml).
>>>
>>> For a regional LC projection that does not include the polar area,
>>> there is no need to mask the projection.
>>> So the first suggestion is to remove:
>>> res@gsnMaskLambertConformal = True
>>>
>>> Second if you set up the projection based on the lat/lon variable
>>> attributes in the GRIB file you can do a "native" projection, which
>>> is faster and presents the data as the GRIB producer output it.
>>> The projection resources you would use are:
>>>
>>> res@mpProjection = "lambertconforma
>>> res@mpLambertParallel1F = lat2d@Latin1 ; (36.228)
>>> res@mpLambertParallel2F = lat2d@Latin2 ; (36.228)
>>> res@mpLambertMeridianF" : lat2d@Lov ; (-122.246)
>>> res@mpLimitMode = "corners"
>>> res@mpLeftCornerLonF = lon2d@corners(0) ; (-168.719)
>>> res@mpLeftCornerLatF = lat2d@corners(0) ; (-8.035)
>>> res@mpRightCornerLonF = lon2d@corners(2) : (-45.67911)
>>> res@mpRightCornerLatF = lat2d@corners(2) ; (42.22018)
>>>
>>> Additionally set
>>>
>>> res@tfDoNDCOverlay = True
>>>
>>> and don't use the lat2d, lon2d coordinate attributes.
>>>
>>> However, you can use any projection for this data if you don't set
>>> tfDoNDCOverlay and do use the lat2d, lon2d coordinates.
>>>
>>> Hope this helps.
>>> -dave
>>> <Mail Attachment.png>
>>>
>>>
>>>
>>>
>>>
>>> On Aug 28, 2013, at 1:31 PM, Rick Brownrigg <brownrig@ucar.edu
>>> <mailto:brownrig@ucar.edu>> wrote:
>>>
>>>> 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
>>>> <mailto: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 19:42:50 2013

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