[ncl-talk] Artifacts at date-line

[Wei Huang]

I am plotting a transparent image (of precipitation) with png file, then slice it to (for example 16, or 64) tiles and then
Put these tiled images on top of Google Map. As you can see, there are two vertical lines (sometimes none, and sometimes one).

Is there any way we can get rid of those lines?

Here are the major resource parameters:

   res                   = True
   res at mpProjection      = "Mercator"       ; choose projection
   res at mpGridAndLimbOn   = False            ; turn on lat/lon lines
   res at mpPerimOn         = False            ; turn off box around plot
   res at mpOutlineOn       = False
   res at mpFillOn               = False
   res at mpLimitMode       = "LatLon"
   res at mpMinLatF         =  -85.0511
   res at mpMaxLatF         =   85.0511
   res at mpMinLonF         = -180.0
   res at mpMaxLonF         =  180.0

   res at vpXF              = 0.0
   res at vpYF              = 1.0
   res at vpWidthF          = 1.0
   res at vpHeightF         = 1.0

   res at gsnAddCyclic      = True

   res at cnFillOn             = True              ; color plot desired
   res at cnLineLabelsOn       = False             ; turn off contour lines
   res at cnLinesOn            = False
   res at cnFillMode           = "AreaFill"
   res at cnLevelSelectionMode = "ExplicitLevels"   ; set explicit contour levels
   res at cnLevels            := levels
   res at cnFillColors        := colors
   res at cnConstFEnableFill   = True ; so zoomed in that filed is const
   res at cnConstFLabelOn      = False

   res at lbLabelBarOn         = False

Thanks,

Wei Huang
whuang at univ-wea.com


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