[ncl-talk] Artifacts at date-line

[Rick Brownrigg]

Hi Wei,

I'm not sure where the lines are coming from.  Are they present in your
pre-tiled image?  Are they in the individual tiles.  Or is it a Google Map
artifact?

I presume they are occurring along tile boundaries?  Its curious that in
the image you sent, the double-lines don't cut across all contour levels?!

Rick




On Tue, Jan 12, 2016 at 12:12 PM, Wei Huang <whuang at univ-wea.com> wrote:

> 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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