[ncl-talk] limit map region for Lambert Conformal projection

[Zhifeng Yang]

Hi Dennis,
Thank you. I tried to add
  res at mpLimitMode            = "Corners"          ; choose range of map
  res at mpLeftCornerLatF       = lat2d(0,0)
  res at mpLeftCornerLonF       = lon2d(0,0)
  res at mpRightCornerLatF      = lat2d(nlat-1,mlon-1)
  res at mpRightCornerLonF      = lon2d(nlat-1,mlon-1)
It can select map range. However, it seems that contour does not move along
with map. So there is a shift between contour and map. Then I want to add
  res at mpProjection           = "LambertConformal"
  res at mpLambertParallel1F    = lat2d at mpLambertParallel1F
  res at mpLambertParallel2F    = lat2d at mpLambertParallel2F
  res at mpLambertMeridianF     = lat2d at mpLambertMeridianF

The problem is there is no latitude attributes (mpLambertParallel1F,
mpLambertParallel2F, mpLambertMeridianF) in wrfout files.

Best,
Zhifeng

On Mon, Jan 27, 2020 at 6:06 PM Dennis Shea <shea at ucar.edu> wrote:

> NARR are Lambert Conformat:
>
> *http://www.ncl.ucar.edu/Applications/narr.shtml*
> <http://www.ncl.ucar.edu/Applications/narr.shtml>
> ncl_3.ncl
>
> See plot section
> ===
> WRF projection information  is contained within the file attributes
>
>    fwrf = addfile("wrf...nc","r")
>    ...
> Something like:
>
> res at mpLambertParallel1F   = fwrf->Latin1
> res at mpLambertParallel2F   = fwrf->Latin2
> res at mpLambertMeridianF    = fwrf->LoV
>
> ========================================
>
>   res at gsnAddCyclic           = False              ; regional data
>
>   res at mpLimitMode            = "Corners"          ; choose range of map
>   res at mpLeftCornerLatF       = lat2d(0,0)
>   res at mpLeftCornerLonF       = lon2d(0,0)
>   res at mpRightCornerLatF      = lat2d(nlat-1,mlon-1)
>   res at mpRightCornerLonF      = lon2d(nlat-1,mlon-1)
>   res at tfDoNDCOverlay         = True
>   res at mpProjection           = "LambertConformal"
>   res at mpLambertParallel1F    = lat2d at mpLambertParallel1F
>   res at mpLambertParallel2F    = lat2d at mpLambertParallel2F
>   res at mpLambertMeridianF     = lat2d at mpLambertMeridianF
>
>
> On Mon, Jan 27, 2020 at 2:02 PM Zhifeng Yang via ncl-talk <
> ncl-talk at ucar.edu> wrote:
>
>> Hi all,
>> I have WRF output files with Lambert Conformal projection. When I plot
>> images with contour on maps, I tried to limit the plot over a specific
>> region, not the whole domain. I tried the following
>>    res at mpLimitMode                  = "latlon"
>>    res at mpMinLatF                    = minlat
>>    res at mpMaxLatF                    = maxlat
>>    res at mpMinLonF                    = minlon
>>    res at mpMaxLonF                    = maxlon
>>
>> However, it seems it does not work. Do you have any ideas on it? Thank
>> you!
>>
>> Best,
>> Zhifeng
>> _______________________________________________
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