[ncl-talk] Misaligned correlation coefficient map

[Ipshita Majhi]

Yes I will look definitely look into my lat lon info and thank you so much


On Friday, February 12, 2016, Mary Haley <haley at ucar.edu> wrote:

> You reordered the data with:
>
> Jan_reorder=Jan_sce(x|:,y|:,time|:)
>
> If "x" corresponds to longitude, and "y" to latitude, then you will be
> unable to plot this over a map, because NCL expects the "latitude"
> dimension to be the leftmost dimension.
>
> You may need to transpose the array before plotting.
>
> You also have to make sure "lat" and "lon" are in the right order as well.
>
> --Mary
>
>
> On Fri, Feb 12, 2016 at 1:44 PM, Ipshita Majhi <ipmajhi at alaska.edu
> <javascript:_e(%7B%7D,'cvml','ipmajhi at alaska.edu');>> wrote:
>
>> Dear NCL,
>>
>> I would like to plot correlation coefficient, the snow cover extent by
>> itself plots well. When I try to plot correlation coefficient it is
>> misaligned, I am not sure why that is happening. I am attaching the plot
>> with this email
>> Any guidance will be helpful
>>
>>
>>
>> ;*********************************************************************************
>> a=addfile("~/Documents/NCL_files/Snow_cover_IMS/NCL_codes/sce_mon_mean.nc","r")
>> ; open output netCDF file
>> b=addfile("~/Documents/NCL_files/Snow_cover_IMS/
>> nhsce_v01r01_19661004_20140602.nc","r")
>>
>> ;Extracting time and snow cover extent (sce) from respective data files
>>
>>
>> time_sce=a->time
>>
>>
>> sce=byte2flt(a->sce)
>>
>> lat=b->latitude
>> lon=b->longitude
>>
>> sce at lat2d=lat
>> sce at lon2d=lon
>>
>> sce at _FillValue = 9.9621e+36
>>
>> ;==============================================
>> ;Now lets correlate with JJAS
>> JJAS_1871_2012
>> =asciiread("~/Documents/NCL_files/SST/Monthly/jjas_1871_2012.txt",(/142,1/),"float")
>> ;Extracting JJAS for 1967 to 2012
>>
>> JJAS_1967_2012=JJAS_1871_2012(96:141,0)
>>
>> ;============================================
>> ;Extracting monthly data for sce
>>
>> Jan_sce = new((/46,88,88/),float)
>>
>> Jan_sce at _FillValue = 9.9621e+36
>>
>> ;==========================================
>>
>> do nyr=0,551,12
>>
>> Jan_sce(nyr/12,:,:) =sce(nyr,:,:)
>>
>> end do
>>
>>
>> Jan_reorder=Jan_sce(x|:,y|:,time|:)
>>
>>
>> corr_jan=escorc(Jan_reorder,JJAS_1967_2012)
>>
>>
>> corr_jan at lat2d=lat
>> corr_jan at lon2d=lon
>>
>> copy_VarCoords_1(sce,corr_jan)
>>
>> ;************************************************
>> ; create plot
>> ;************************************************
>>   wks = gsn_open_wks("x11","Jan_sce_jjas_cor")               ;
>>
>> ;***********************************************
>> ; create array of named colors. Note that you have
>> ; to include the forground (white), and background (black)
>> ; as the first two colors
>> ;***********************************************
>>
>>   res = True                                     ; plot mods desired
>>
>>   res at tiMainString         = "January SCE and JJAS cor" ; plot title
>>
>>   res at cnFillOn             = True               ; turns on the color
>>   res at mpFillOn             = False              ; turns off continent
>> gray
>>   res at cnLinesOn            = False              ; turn off contour lines
>>
>>   res at gsnPolar             = "NH"               ; specify the hemisphere
>>   res at mpMinLatF            = 20               ; specify min lat
>>
>>   plot = gsn_csm_contour_map_polar(wks,corr_jan,res)
>> ;=============================================
>>
>>
>>
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>

-- 
Ipshita Majhi
PhD Candidate
University of Alaska , Fairbanks
Atmospheric Science Department
(907)978-4220 ipmajhi at alaska.edu
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