<div style="line-height:1.7;color:#000000;font-size:14px;font-family:Arial"><div style="margin:0;">Dear all:</div><div style="margin:0;"><span style="font-family: verdana, sans-serif; font-size: 13.3333px; background-color: rgb(255, 231, 198);">I have failed to draw a color filled contour field  over the area specified in </span><em style="margin: 0px; padding: 0px; text-decoration-line: none; color: rgb(133, 45, 133); font-family: verdana, sans-serif; font-size: 13.3333px;"><a href="http://www.ncl.ucar.edu/Document/Graphics/Resources/mp.shtml#mpFillAreaSpecifiers" style="margin: 0px; padding: 0px; text-decoration-line: none; color: rgb(133, 45, 133); font-family: verdana, sans-serif; font-size: 13.3333px;">mpFillAreaSpecifiers</a><span style="background-color: rgb(255, 231, 198);">,</span></em><span style="background-color: rgb(255, 231, 198); font-family: verdana, sans-serif; font-size: 13.3333px;"> </span><span style="background-color: rgb(255, 231, 198); font-family: verdana, sans-serif; font-size: 13.3333px;"> but i can't figure out the reason.Please help me,thank you very much.</span></div><div style="margin:0;"><br></div><div style="margin:0;"><div style="margin: 0px;"><div style="margin: 0px;">;*************************************************</div><div style="margin: 0px;">; This file is loaded by default in NCL V6.2.0 and newer</div><div style="margin: 0px;">  load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl" </div><div style="margin: 0px;">  load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_csm.ncl"</div><div style="margin: 0px;">  load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/contributed.ncl"  </div><div style="margin: 0px;">;************************************************</div><div style="margin: 0px;">begin</div><div style="margin: 0px;">;************************************************</div><div style="margin: 0px;">; read in txt file</div><div style="margin: 0px;">;************************************************</div><div style="margin: 0px;">  fname = "./20210725_1200.txt"</div><div style="margin: 0px;">  lines  = asciiread(fname,-1,"string")</div><div style="margin: 0px;">  lon=stringtofloat(str_get_field(lines(0:),1," "))</div><div style="margin: 0px;">  lat=stringtofloat(str_get_field(lines(0:),2," "))</div><div style="margin: 0px;">  pre=stringtofloat(str_get_field(lines(0:),3," "))</div><div style="margin: 0px;"><br></div><div style="margin: 0px;">;************************************************</div><div style="margin: 0px;">; plotting parameters</div><div style="margin: 0px;">;************************************************</div><div style="margin: 0px;">  wks = gsn_open_wks("png","pre-19")             ; send graphics to PNG file</div><div style="margin: 0px;">  gsn_define_colormap(wks,"WhViBlGrYeOrReWh")</div><div style="margin: 0px;"><br></div><div style="margin: 0px;">  </div><div style="margin: 0px;">  res                 = True </div><div style="margin: 0px;">  res@gsnDraw        = False</div><div style="margin: 0px;">  res@gsnFrame       = False </div><div style="margin: 0px;">  res@gsnMaximize    = True </div><div style="margin: 0px;"><br></div><div style="margin: 0px;">;  res@gsnLeftString  = ""</div><div style="margin: 0px;">;  res@gsnRightString = ""                 </div><div style="margin: 0px;"><br></div><div style="margin: 0px;">;----map---------------------  </div><div style="margin: 0px;">  res@mpMinLatF           = 30.                  </div><div style="margin: 0px;">  res@mpMaxLatF           = 45.</div><div style="margin: 0px;">  res@mpMinLonF           = 90.</div><div style="margin: 0px;">  res@mpMaxLonF           = 110.</div><div style="margin: 0px;"><br></div><div style="margin: 0px;">  res@mpFillOn                   = True</div><div style="margin: 0px;">  res@mpDataSetName               = "Earth..4"</div><div style="margin: 0px;">  res@mpDataBaseVersion           = "MediumRes"</div><div style="margin: 0px;">  res@mpAreaMaskingOn            = True</div><div style="margin: 0px;">  res@mpMaskAreaSpecifiers       = (/"China:states"/)</div><div style="margin: 0px;">  res@mpOutlineSpecifiers        = (/"China:states"/)</div><div style="margin: 0px;">    </div><div style="margin: 0px;">  res@mpLandFillColor            = "white"</div><div style="margin: 0px;">  res@mpInlandWaterFillColor     = "white"</div><div style="margin: 0px;">  res@mpOceanFillColor           = "white"</div><div style="margin: 0px;">  res@mpFillBoundarySets         = "NoBoundaries"</div><div style="margin: 0px;">  res@mpOutlineBoundarySets      = "NoBoundaries"</div><div style="margin: 0px;">  res@mpNationalLineColor        = "black"</div><div style="margin: 0px;">  res@mpProvincialLineColor      = "black"</div><div style="margin: 0px;">  res@mpGeophysicalLineColor     = "black"</div><div style="margin: 0px;">  res@mpNationalLineThicknessF   = 2</div><div style="margin: 0px;">  res@mpProvincialLineThicknessF = 1</div><div style="margin: 0px;"><br></div><div style="margin: 0px;">;--contour------------------------</div><div style="margin: 0px;"> </div><div style="margin: 0px;">  res@cnFillOn                   = True</div><div style="margin: 0px;">  res@cnFillDrawOrder            = "PreDraw"</div><div style="margin: 0px;">  res@cnLinesOn                  = False</div><div style="margin: 0px;">  res@cnLineLabelsOn             = False</div><div style="margin: 0px;">  res@sfXArray            =lon</div><div style="margin: 0px;">  res@sfYArray            =lat</div><div style="margin: 0px;">  res@cnLevelSelectionMode = "ExplicitLevels"</div><div style="margin: 0px;">  res@cnLevels             = (/0.1,1.0,5.0,10.0,20.0,30.0,40,50/)</div><div style="margin: 0px;">  res@cnFillColors = (/"White","DarkOliveGreen1", \</div><div style="margin: 0px;">                       "Chartreuse3","Green", \</div><div style="margin: 0px;">                       "Yellow","Orange","Red","Violet"/)</div><div style="margin: 0px;"><br></div><div style="margin: 0px;">  res@lbLabelAutoStride          = True</div><div style="margin: 0px;">  res@pmTickMarkDisplayMode      = "Always"</div><div style="margin: 0px;">  res@gsnRightString             = "mm"</div><div style="margin: 0px;"><br></div><div style="margin: 0px;">;--full map-----------------------</div><div style="margin: 0px;">  res@gsnLeftString              = "Precipitation"</div><div style="margin: 0px;">  map = gsn_csm_contour_map(wks,pre,res) </div><div style="margin: 0px;">  draw(map)</div><div style="margin: 0px;">  frame(wks)                                           </div><div style="margin: 0px;">;--gansu-------------------------- </div><div style="margin: 0px;">  res@mpMaskAreaSpecifiers       = "Gansu"</div><div style="margin: 0px;">  res@gsnLeftString              = "Precipitation"</div><div style="margin: 0px;">  map2 = gsn_csm_contour_map(wks,pre,res) </div><div style="margin: 0px;">  draw(map2)</div><div style="margin: 0px;">  frame(wks)</div><div style="margin: 0px;">end</div></div></div></div><br><br><span title="neteasefooter"><p> </p></span>