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求助各位大神:我的nc文件是兰伯特投影的,但是试了半天发现南海不能准确加在图上。
大陆倒是可以兰伯特投影,但是只能用‘latlon’的设置,‘lambert’也不可以。
代码如下
wks = gsn_open_wks ("png", "diff") ; open workstation
gsn_define_colormap(wks,"BlueWhiteOrangeRed")
; cmap = read_colormap_file("BlAqGrYeOrReVi200")
res = True ; plot mods desired
res@gsnMaximize = True
res@gsnDraw = False
res@gsnFrame = False
res@pmTickMarkDisplayMode = "Always" ; turn on tickmarks
res@mpMinLatF = 17.
res@mpMaxLatF = 55.
res@mpMinLonF = 72.
res@mpMaxLonF = 136.
res@tiMainString = "New - Bak"
res@gsnLeftString = "2018-11-10 00:00"
res@gsnRightString = "ppm"
res@tiMainFontHeightF = 0.020 ; smaller title
res@tiMainOffsetYF = -0.005 ; move title down
res@gsnAddCyclic = False ; regional data
res@gsnMaximize = True ; enlarge image
res@mpLimitMode = "LatLon" ; choose region of map
res@mpMinLatF = min(lat2d)-1 ; Add a little bit of
res@mpMinLonF = min(lon2d)-1 ; a margin around
res@mpMaxLatF = max(lat2d)+1 ; the plot.
res@mpMaxLonF = max(lon2d)+1
res@trGridType = "TriangularMesh"
res@sfXArray = lon2d
res@sfYArray = lat2d
res@mpFillOn = False
res@mpGridAndLimbOn = True
res@mpGridLineThicknessF = 0.5
res@mpGridLineDashPattern = 2
res@mpGridSpacingF =15.
res@tfDoNDCOverlay = True
res@mpFillOn = True
res@mpDataSetName = "/export/home/zhangshan/pics/NCL-Chinamap/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
res@cnFillOn = True
res@cnFillDrawOrder = "PreDraw" ; draw contours first
; res@cnFillPalette = cmap(2:,:) ; subset the color map
res@cnLinesOn = False ; no contour lines
res@cnLineLabelsOn = False ; no contour labels
res@cnInfoLabelOn = False ; no contour info label
res@lbLabelAutoStride = True
res@tmXTOn =False
res@tmYROn =False
;res@mpOutlineDrawOrder = "PostDraw" ; draw continental outline last
;res@mpOutlineBoundarySets = "GeophysicalAndUSStates" ; state boundaries
res@mpGridAndLimbOn = True
res@mpGridLineThicknessF = 0.5
res@mpGridLineDashPattern = 2
res@mpGridSpacingF =10.
res@cnFillOn = True
res@cnLevelSelectionMode = "ExplicitLevels"
res@cnLevels = (/-60,-50,-40,-30,-20,-10,0,10,20,30,40,50,60/)
res@cnFillColors = (/2,17,30,40,50,65,88,158,177,186,202,220,238,255/)
;res@mpOutlineDrawOrder = "PostDraw" ; draw continental outline last
;res@mpOutlineBoundarySets = "GeophysicalAndUSStates" ; state boundaries
res@pmLabelBarWidthF = 0.5
res@pmLabelBarHeightF = 0.1
res@lbLabelFontHeightF = 0.01 ; label bar font height
res@pmLabelBarOrthogonalPosF = 0.05
res@lbBoxLinesOn = False
;res@tfDoNDCOverlay = True
plot = gsn_csm_contour_map(wks,diff,res)
;--- add South China Sea ---
nhres = True
nhres@gsnMaximize = 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
nhres@lbLabelBarOn = False
nhres@tmXBOn = False
nhres@tmXTOn = False
nhres@tmYLOn = False
nhres@tmYROn = False
nhres@gsnLeftString = ""
nhres@gsnRightString = ""
map_nanhai = gsn_csm_contour_map(wks,diff,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(plot,map_nanhai,adres)
draw(plot)
frame(wks)
end
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