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plot_with_correct_Chinamap.ncl
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plot_with_correct_Chinamap.ncl
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;***********************************************************;
; ;
; This script is a example to plot contours on China map. ;
; Written by Huang Yongjie(IAP/CAS), 2016-05-22. ;
; ;
;***********************************************************;
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"
begin
f=addfile("pres.mon.ltm.nc","r")
pres= f->pres(0,:,:)
;---------------------------------------------------------------
wks = gsn_open_wks("x11","Correct_China_boundary")
gsn_define_colormap( wks ,"gui_default")
res = True
res@gsnMaximize = True
res@gsnDraw = False
res@gsnFrame = False
;---------------------------------------------------------------
; set for the map
res@mpMinLatF = 0.
res@mpMaxLatF = 55.
res@mpMinLonF = 72.
res@mpMaxLonF = 136.
res@mpFillOn = True
res@mpDataSetName = "./database/Earth..4"
res@mpDataBaseVersion = "MediumRes" ; or "Ncarg4_1"
res@mpAreaMaskingOn = True
res@mpMaskAreaSpecifiers = (/"China"/)
res@mpOutlineSpecifiers = (/"China","China:Provinces"/)
res@mpLandFillColor = "white"
res@mpInlandWaterFillColor = "white"
res@mpOceanFillColor = "white"
res@mpFillBoundarySets = "NoBoundaries"
res@mpOutlineBoundarySets = "NoBoundaries"
res@mpNationalLineColor = "black"
res@mpProvincialLineColor = "black"
res@mpGeophysicalLineColor = "black"
res@mpNationalLineThicknessF = 2
res@mpProvincialLineThicknessF = 1
;---------------------------------------------------------------
; set for the plot
res@cnFillOn = True
res@cnFillDrawOrder = "PreDraw"
res@cnLinesOn = False
res@cnLineLabelsOn = False
res@cnLevelSelectionMode = "ExplicitLevels"
res@cnLevels = ispan(520,1080,20)
res@cnFillPalette = "gui_default"
res@lbLabelAutoStride = True
res@pmTickMarkDisplayMode = "Always"
res@gsnRightString = "hPa"
;---------------------------------------------------------------
; plot the full China map
res@gsnLeftString = "Surface pressure over full China Map"
map = gsn_csm_contour_map(wks,pres,res)
draw(map)
frame(wks)
;---------------------------------------------------------------
; plot one part of China map with South China Sea subplot
res@mpMinLatF = 17.
res@gsnLeftString = "Surface pressure over part China Map with SCS"
map1 = gsn_csm_contour_map(wks,pres,res)
;--- add South China Sea ---
nhres = True
nhres@gsnFrame = False
nhres@gsnDraw = False
nhres@vpHeightF = 0.18
nhres@vpWidthF = 0.18
nhres@mpMinLatF = 2.0
nhres@mpMaxLatF = 23.0
nhres@mpMinLonF = 105.0
nhres@mpMaxLonF = 123.0
getvalues map1
"mpDataSetName" : nhres@mpDataSetName
"mpDataBaseVersion" : nhres@mpDataBaseVersion
"mpFillOn" : nhres@mpFillOn
"mpFillDrawOrder" : nhres@mpFillDrawOrder
"mpAreaMaskingOn" : nhres@mpAreaMaskingOn
"mpMaskAreaSpecifiers" : nhres@mpMaskAreaSpecifiers
"mpOutlineSpecifiers" : nhres@mpOutlineSpecifiers
"mpOutlineBoundarySets" : nhres@mpOutlineBoundarySets
"mpLandFillColor" : nhres@mpLandFillColor
"mpOceanFillColor" : nhres@mpOceanFillColor
"mpInlandWaterFillColor" : nhres@mpInlandWaterFillColor
"mpNationalLineColor" : nhres@mpNationalLineColor
"mpProvincialLineColor" : nhres@mpProvincialLineColor
end getvalues
getvalues map1@contour
"cnFillOn" : nhres@cnFillOn
"cnLevelSelectionMode" : nhres@cnLevelSelectionMode
"cnLevels" : nhres@cnLevels
"cnFillColors" : nhres@cnFillColors
"cnFillDrawOrder" : nhres@cnFillDrawOrder
"cnLinesOn" : nhres@cnLinesOn
"cnLineLabelsOn" : nhres@cnLineLabelsOn
end getvalues
nhres@lbLabelBarOn = False
nhres@tmXBOn = False
nhres@tmYLOn = False
nhres@tmYROn = False
nhres@tmXTOn = False
nhres@gsnLeftString = ""
nhres@gsnRightString = ""
map_nanhai = gsn_csm_contour_map(wks,pres,nhres)
adres = True
adres@amParallelPosF = 0.495 ; -0.5 is the left edge of the plot.
adres@amOrthogonalPosF = 0.49 ; -0.5 is the top edge of the plot.
adres@amJust = "BottomRight"
plotnh = gsn_add_annotation(map1,map_nanhai,adres)
draw(map1)
frame(wks)
;---------------------------------------------------------------
; Mask Xinjiang plot
res@mpMaskAreaSpecifiers = "Xinjiang Uygur"
res@gsnLeftString = "Surface pressure in Xinjiang with NCL Mask"
map2 = gsn_csm_contour_map(wks,pres,res)
;---------------------------------------------------------------
; Mask Xizang plot
res@mpMaskAreaSpecifiers = "Xizang"
res@gsnLeftString = "Surface pressure in Xizang with NCL Mask"
map3 = gsn_csm_contour_map(wks,pres,res)
;---------------------------------------------------------------
; Mask Beijing plot
res@mpOutlineSpecifiers := "Beijing Shi"
res@mpMaskAreaSpecifiers = "Beijing Shi"
res@mpMinLatF = 39.4
res@mpMaxLatF = 41.15
res@mpMinLonF = 115.25
res@mpMaxLonF = 117.6
res@mpShapeMode = "FreeAspect"
res@gsnLeftString = "Surface pressure in Beijing with NCL Mask and shp boundaries"
res@gsnRightString = ""
map4 = gsn_csm_contour_map(wks,pres,res)
;--- add shp file boundaries ---
ShpDir = "./cnmap/" ;"$NCARG_ROOT/lib/ncarg/nclscripts/cnmap/"
cnres = True
cnres@gsLineThicknessF = 2.0
cnres@gsLineColor = "red"
getvalues map4
"mpMinLatF" : cnres@minlat
"mpMaxLatF" : cnres@maxlat
"mpMinLonF" : cnres@minlon
"mpMaxLonF" : cnres@maxlon
end getvalues
plotshp = gsn_add_shapefile_polylines(wks,map4,ShpDir+"cnhimap.shp",cnres)
;---------------------------------------------------------------
gsn_panel(wks,(/map1,map2,map3,map4/),(/2,2/),True)
end