[ncl-talk] How to avoid Interpolation outside shapefile

[Rick Brownrigg]

Can you either i) provide the shapefile (and I'll point out that means the
.shp, .shx, .dbf files), or perhaps show us the results of

   ncl_filedump District_Boundary.shp

Rick


On Wed, Jan 8, 2020 at 7:24 AM Ajay Bankar via ncl-talk <ncl-talk at ucar.edu>
wrote:

> Dear NCL Users,
>                             I'm trying to make spatial plot of rainfall
> from station data available in csv file. I tried different options in
> resources but data is not masking with shapefile.
> I have attached plot and data file for reference.
>
> Thanks for any help!
>
> Here is my script
>
> load "/shp.ncl"
>
> begin
>  ;-- shapefile name
>  shp_filename =
> "/scratch/Administrative_Boundary_Headquarters/District_Boundary.shp"
>
>  infile = "station_data.csv"
>  lines = asciiread(infile, -1, "string")
>
> rain = tofloat( str_get_field(lines(1:), 7, ","))
> rain at lat1d  = tofloat( str_get_field(lines(1:), 5, ","))
> rain at lon1d  = tofloat( str_get_field(lines(1:), 6, ","))
> ;print(rain)
>
> ;-- define sub-region, here for Karnataka
>      minlat =  11
>      maxlat =  19
>      minlon =  73.5
>      maxlon =  79.1
>
> ;-- open workstation
>      wks_type          = "pdf"
>      wks  = gsn_open_wks(wks_type, "station_plot")
>  ;-- resource settings
>      res                        =  True
>      res at gsnDraw                =  False                       ;-- don't
> draw plot yet
>      res at gsnFrame               =  False                       ;-- don't
> advance frame yet
>      res at gsnMaximize            =  True                        ;--
> maximize plot in frame
>
>   ;  res at tfDoNDCOverlay        = True
>
>     cmap     := read_colormap_file("BlAqGrYeOrReVi200")
>     cmap(0,:) = (/0,0,0,0/)    ; make first color fully transparent
>     res at cnFillOn               =  True
>     res at cnLinesOn              =  False
>     res at cnLineLabelsOn         =  False
>     res at cnFillPalette          = cmap
> ;"BlueYellowRed"
>     res at cnLevelSelectionMode   = "ExplicitLevels"               ;--
> manually set contour levels
>     res at cnLevels        = (/5,20,35,50,65,80,95,110,125,140,155/)
>     res at gsnAddCyclic           = False
>
>     res at mpGridLineColor        =  0                          ;"grey40"
>     res at mpFillOn               =  False
>     res at mpOutlineOn            =  False
>     res at mpGeophysicalLineColor = "black"
>     res at mpLimitMode            = "LatLon"
>     res at mpMinLatF              = minlat
>     res at mpMaxLatF              = maxlat
>     res at mpMinLonF              = minlon
>     res at mpMaxLonF              = maxlon
>     ;res at mpAreaMaskingOn        = True
>
>    res at lbBoxMinorExtentF      =  0.1                         ;-- decrease
> height of labelbar boxes
>    res at pmLabelBarOrthogonalPosF = 0.08                      ;-- move
> labelbar to the left side of plot
>    res at lbBoxMinorExtentF      =  0.2                         ;-- decrease
> height of labelbar boxes
>
>    res at pmTickMarkDisplayMode  = "Always"
>    res at tmXTOn                 =  False
>    res at tiMainString           = "STATION DATA PLOT"
>
>  ;-- create plot
>     plot = gsn_csm_contour_map(wks,rain,res)
>     var_mask = shapefile_mask_data(rain,shp_filename,True)
>
>  ;-- create contours of masked data
>     plot_mask = gsn_csm_contour_map(wks,var_mask,res)
>
>  ;-- add plot_mask to plot
>      lnres                    =  True
>      lnres at gsLineColor        = "black"
>      lnres at gsLineThicknessF   =  1.0
>
>      plot at lines = gsn_add_shapefile_polylines(wks, plot_mask,
> shp_filename, lnres)
>
>   ;-- draw the plot and advance the frame
>      draw(plot_mask)
>      frame(wks)
>  end
> --
>
> *Thanks & Regards,*
>
> *Ajay*
>
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