ncl 画图时等值线不圆滑，直角拐弯

liyuan3970

begin
path = "hwf.nc"
f=addfile(path,"r")
;f1=addfile("avg.nc","c")
ap=f->ap
b=dim_avg_n(ap,0)
b!0="lat"
b!1="lon"
lon=fspan(-180,180,96)
lat=fspan(-90,90,73)
b&lon=lon
b&lat=lat
b&lon@long_name="lon"
b&lon@units="degrees_east"
b&lat@long_name="lat"
b&lat@units="degrees_north"
print(max(b))
print(min(b))
;f1->avg=b
;»-í¼
wks = gsn_open_wks("png","hwfavg")
res=True
;éèÖþ-Î3¶è
res@cnMissingValFillColor = "white"      
res@gsnAddCyclic        = False
res@mpCenterLonF         = 100  
res@mpLimitMode       = "LatLon"
res@mpMinLatF         = 20         
res@mpMaxLatF         = 60
res@mpMinLonF         = 70
res@mpMaxLonF         = 140
res@cnLineLabelsOn             = True  
;ÏÔê¾ÖD1úÇøóòμÄí¼
res@mpDataBaseVersion="Ncarg4_1"       ;ÖDμè·Ö±æÂê
res@mpDataSetName="Earth..4"           ;μú4°æμØí¼￡¬óDÖD1ú±ß½çêy¾Y
res@mpOutlineOn            = True
res@mpOutlineSpecifiers=(/"China:states","Taiwan"/)   ;ÖD1ú±ß½çóDÎêìa￡¬è±2ØÄÏ¡￠ì¨íå
res@mpOutlineBoundarySets ="NoBoundaries"
;í¼Ï¸½ú
res@cnFillOn       = True
res@cnMissingValFillColor = "white"
res@cnLevelSelectionMode = "ExplicitLevels"
res@cnLevels = (/8,8.5,9,9.5,10,10.5/)
res@cnSmoothingOn      =True
;res@cnRasterSmoothingOn =True

res@cnSmoothingTensionF   =0.006




res@cnSmoothingDistanceF  =0.07
;é«°å
;gsn_define_colormap(wks,"11colors")
;±êìa
res@tiMainString    = "hwfavg1950-2014"
;×ø±ê
res@tmXBMode = "Explicit"
res@tmXBValues = (/"70","80","90","100","110","120","130","140"/)
res@tmXBLabels  = (/"70E","80E", "90E", "100E","110E","120E","130E","140E"/)
;¼ä¾à
;res@cnLevelSelectionMode="ManualLevels"
;res@cnMinLevelValF=7.5
;res@cnMaxLevelValF=11
;res@cnLevelSpacingF=0.5
;res@cnLineLabelInterval =1
plot = gsn_csm_contour_map(wks,b,res)      
end