[ncl-talk] Significance calculation
Ipshita Majhi
ipmajhi at alaska.edu
Tue Sep 1 11:43:41 MDT 2015
Thank you, I will try it and let you know. It is very unlikely that
everything is significant
On Tue, Sep 1, 2015 at 12:21 PM, Adam Phillips <asphilli at ucar.edu> wrote:
> Hi Ipshita,
> Is it possible that all your grid points are significant using your
> definition of greater than 0.9? If that is the case NCL may not draw your
> stippling field depending on your NCL version. Try setting
> cnConstFEnableFill = True or you can try setting prob_djf(0,0) = 0.89.
>
>
> http://www.ncl.ucar.edu/Document/Graphics/Resources/cn.shtml#cnConstFEnableFill
>
> If that does not fix your issue or if you have any further questions
> please respond to the ncl-talk email list.
> Adam
>
>
> On Sat, Aug 29, 2015 at 11:06 PM, Ipshita Majhi <ipmajhi at alaska.edu>
> wrote:
>
>> Dear NCL,
>>
>> I would like to calculate the significance. I am using the probability
>> function, i am not sure where things are not working out. There are no
>> error message, the code runs but no stippling show for significance.
>> Here is the code
>>
>> ;This is for correlating JJAS monthly precp with JJAS temperature with lag
>>
>> ;******************************************************
>> load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"
>> load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_csm.ncl"
>> load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/contributed.ncl"
>> load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/shea_util.ncl"
>> ;*******************************************************
>>
>> ;=============================================
>> ; Reading data
>> ;=============================================
>>
>> a=addfile("~/Documents/SST/Monthly/sst.mnmean.v4.nc","r")
>>
>> ;==============================================
>>
>> JJAS_1871_2012
>> =asciiread("~/Documents/SST/Monthly/jjas_1871_2012.txt",(/142,1/),"float")
>> ;Extracting JJAS for 1967 to 2012
>>
>> JJAS_1967_2012=JJAS_1871_2012(96:141,0)
>> print(dimsizes(JJAS_1967_2012))
>>
>> e=transpose(transpose(JJAS_1967_2012))
>> ;print(dimsizes(e))
>>
>> ;=============================================
>>
>> ;For some months around september it is better to
>> ;=============================================
>> ;The dataset goes from 1854-2015
>> sst=a->sst
>> ; copy meta data and coordinate variables using contributed functions
>> copy_VarAtts(a,sst)
>> copy_VarCoords_1(a,sst)
>> ;============================================
>>
>> ;Extracting 1967-2012 for SST
>> sst_1967_2012=sst(1367:1918,:,:)
>>
>>
>> copy_VarAtts(sst,sst_1967_2012)
>> copy_VarCoords_1(a,sst_1967_2012)
>>
>> ;============================================
>> ;Seasonal three month average
>>
>>
>> sst_djf=month_to_season(sst_1967_2012, "DJF")
>> sst_jfm=month_to_season(sst_1967_2012, "JFM")
>> sst_fma=month_to_season(sst_1967_2012, "FMA")
>> sst_mam=month_to_season(sst_1967_2012, "MAM")
>> sst_amj=month_to_season(sst_1967_2012, "AMJ")
>> sst_mjj=month_to_season(sst_1967_2012, "MJJ")
>> sst_jja=month_to_season(sst_1967_2012, "JJA")
>> sst_jas=month_to_season(sst_1967_2012, "JAS")
>> sst_aso=month_to_season(sst_1967_2012, "ASO")
>> sst_son=month_to_season(sst_1967_2012, "SON")
>> sst_ond=month_to_season(sst_1967_2012, "OND")
>> sst_ndj=month_to_season(sst_1967_2012, "NDJ")
>>
>> ;==============================================
>> ;Copying Attributes and Coordinates
>>
>> copy_VarAtts(sst_1967_2012,sst_djf)
>> copy_VarCoords_1(sst_1967_2012,sst_djf)
>>
>> copy_VarAtts(sst_1967_2012,sst_jfm)
>> copy_VarCoords_1(sst_1967_2012,sst_jfm)
>>
>> copy_VarAtts(sst_1967_2012,sst_fma)
>> copy_VarCoords_1(sst_1967_2012,sst_fma)
>>
>> copy_VarAtts(sst_1967_2012,sst_mam)
>> copy_VarCoords_1(sst_1967_2012,sst_mam)
>>
>> copy_VarAtts(sst_1967_2012,sst_amj)
>> copy_VarCoords_1(sst_1967_2012,sst_amj)
>>
>> copy_VarAtts(sst_1967_2012,sst_mjj)
>> copy_VarCoords_1(sst_1967_2012,sst_mjj)
>>
>> copy_VarAtts(sst_1967_2012,sst_jja)
>> copy_VarCoords_1(sst_1967_2012,sst_jja)
>>
>> copy_VarAtts(sst_1967_2012,sst_jas)
>> copy_VarCoords_1(sst_1967_2012,sst_jas)
>>
>> copy_VarAtts(sst_1967_2012,sst_aso)
>> copy_VarCoords_1(sst_1967_2012,sst_aso)
>>
>> copy_VarAtts(sst_1967_2012,sst_son)
>> copy_VarCoords_1(sst_1967_2012,sst_son)
>>
>> copy_VarAtts(sst_1967_2012,sst_ond)
>> copy_VarCoords_1(sst_1967_2012,sst_ond)
>>
>> copy_VarAtts(sst_1967_2012,sst_ndj)
>> copy_VarCoords_1(sst_1967_2012,sst_ndj)
>>
>> ;=============================================
>>
>> ;Calculating correlation
>>
>>
>>
>> djf_reorder=sst_djf(lat|:,lon|:,time|:)
>> jfm_reorder=sst_jfm(lat|:,lon|:,time|:)
>> fma_reorder=sst_fma(lat|:,lon|:,time|:)
>> mam_reorder=sst_mam(lat|:,lon|:,time|:)
>> amj_reorder=sst_amj(lat|:,lon|:,time|:)
>> mjj_reorder=sst_mjj(lat|:,lon|:,time|:)
>> jja_reorder=sst_jja(lat|:,lon|:,time|:)
>> jas_reorder=sst_jas(lat|:,lon|:,time|:)
>> aso_reorder=sst_aso(lat|:,lon|:,time|:)
>> son_reorder=sst_son(lat|:,lon|:,time|:)
>> ond_reorder=sst_ond(lat|:,lon|:,time|:)
>> ndj_reorder=sst_ndj(lat|:,lon|:,time|:)
>>
>> ;===================================================
>>
>> copy_VarAtts(sst_djf,djf_reorder)
>> copy_VarCoords_1(sst_djf,djf_reorder)
>>
>> copy_VarAtts(sst_jfm,jfm_reorder)
>> copy_VarCoords_1(sst_jfm,jfm_reorder)
>>
>> copy_VarAtts(sst_fma,fma_reorder)
>> copy_VarCoords_1(sst_fma,fma_reorder)
>>
>> copy_VarAtts(sst_mam,mam_reorder)
>> copy_VarCoords_1(sst_mam,mam_reorder)
>>
>> copy_VarAtts(sst_amj,amj_reorder)
>> copy_VarCoords_1(sst_amj,amj_reorder)
>>
>> copy_VarAtts(sst_mjj,mjj_reorder)
>> copy_VarCoords_1(sst_mjj,mjj_reorder)
>>
>> copy_VarAtts(sst_jja,jja_reorder)
>> copy_VarCoords_1(sst_jja,jja_reorder)
>>
>> copy_VarAtts(sst_jas,jas_reorder)
>> copy_VarCoords_1(sst_jas,jas_reorder)
>>
>> copy_VarAtts(sst_aso,aso_reorder)
>> copy_VarCoords_1(sst_aso,aso_reorder)
>>
>> copy_VarAtts(sst_son,son_reorder)
>> copy_VarCoords_1(sst_son,son_reorder)
>>
>> copy_VarAtts(sst_ond,ond_reorder)
>> copy_VarCoords_1(sst_ond,ond_reorder)
>>
>> copy_VarAtts(sst_ndj,ndj_reorder)
>> copy_VarCoords_1(sst_ndj,ndj_reorder)
>>
>> ;=======================================
>> ;Calculating Correlation Coefficient
>>
>> ;Months with Lag
>> corr_djf=esccr(JJAS_1967_2012,djf_reorder,1)
>> corr_ndj=escorc(ndj_reorder(:,:,0:44),JJAS_1967_2012(1:45))
>> corr_ond=escorc(ond_reorder(:,:,0:44),JJAS_1967_2012(1:45))
>> corr_son=escorc(son_reorder(:,:,0:44),JJAS_1967_2012(1:45))
>> corr_aso=escorc(aso_reorder(:,:,0:44),JJAS_1967_2012(1:45))
>>
>> copy_VarAtts(djf_reorder,corr_djf)
>> copy_VarCoords_1(djf_reorder,corr_djf)
>>
>> copy_VarAtts(ndj_reorder,corr_ndj)
>> copy_VarCoords_1(ndj_reorder,corr_ndj)
>>
>> copy_VarAtts(ond_reorder,corr_ond)
>> copy_VarCoords_1(ond_reorder,corr_ond)
>>
>> copy_VarAtts(son_reorder,corr_son)
>> copy_VarCoords_1(son_reorder,corr_son)
>>
>> copy_VarAtts(aso_reorder,corr_aso)
>> copy_VarCoords_1(aso_reorder,corr_aso)
>>
>> ;========================================
>> ;Probability
>> x=corr_djf(:,:,1)
>> print(dimsizes(x))
>> ;==============================
>> ; Now plotting the correlation
>>
>> ;===========================================
>>
>> ; Now plotting the correlation
>>
>>
>> wks =
>> gsn_open_wks("pdf","DJF_sst_jjas_cor_prob_sig_lag")
>> gsn_define_colormap(wks,"BlWhRe") ; choose colormap
>>
>> res = True ; make plot mods
>> res at gsnDraw = False
>> res at gsnFrame = False
>> res at cnFillOn = True ; turn on color
>> res at gsnSpreadColors = True ; use full colormap
>> res at lbLabelAutoStride = True ; automatic lb label stride
>>
>> res at cnLinesOn = False ; turn off contour lines
>> res at cnLevelSelectionMode = "ManualLevels" ; manually set cnlev
>> res at cnMinLevelValF = -1. ; min level
>> res at cnMaxLevelValF = 1. ; max level
>> res at cnLevelSpacingF = .1 ; contour level spacing
>>
>> lag = 0
>> res at tiMainString = "DJF SST with JJAS rainfall"
>> plotA = gsn_csm_contour_map_ce(wks,corr_djf,res)
>>
>> ; Significance plot on top of correlation plot
>> ;========================= PLOT 2 =========
>> res2 = True ; res2 probability plots
>>
>> res2 at gsnDraw = False ; Do not draw plot
>> res2 at gsnFrame = False ; Do not advance frome
>> res2 at cnFillOn = True ; turn on color/pattern fill
>> res2 at cnMonoFillPattern = False ; allow different patterns
>> res2 at cnMonoFillColor = True ; only use one color (black)
>>
>> res2 at cnLevelSelectionMode = "ExplicitLevels" ; set explicit cnlev
>> res2 at cnLevels = (/.90/) ; only have 1 contour level
>> res2 at cnFillPatterns = (/-1,17/) ; don't fill <0.95, stipple >=0.95
>>
>> res2 at gsnAddCyclic = True ; may or may not be needed
>>
>> res2 at cnInfoLabelOn = False ; turn off info label
>>
>> res2 at cnLinesOn = False ; do not draw contour lines
>> res2 at cnLineLabelsOn = False ; do not draw contour labels
>>
>> res2 at cnFillScaleF = 0.5 ; add extra density
>>
>> printMinMax(prob_djf,0) ; check to make sure values are
>> ; between 0 and 1.
>>
>> plot2 = gsn_csm_contour(wks,prob_djf, res2)
>> overlay (plotA, plot2)
>>
>> draw (plotA)
>> frame(wks)
>>
>> Best Regards
>> Ipshita
>>
>>
>>
>>
>> _______________________________________________
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>>
>>
>
>
> --
> Adam Phillips
> Associate Scientist, Climate and Global Dynamics Laboratory, NCAR
> www.cgd.ucar.edu/staff/asphilli/ 303-497-1726
>
> <http://www.cgd.ucar.edu/staff/asphilli>
>
--
Ipshita Majhi
PhD Candidate
University of Alaska , Fairbanks
Atmospheric Science Department
(907)978-4220 ipmajhi at alaska.edu
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