Re: unknown diagonal white line on gsn_csm_map plot

Hi Rick,

you are right, its independent from setting @mpLandFillColor (i changed my map corners...)

> Hmmm…I believe you, but that's counter to what I was about to report. What color did you set the resource to, and which workstation device are you using (always png?)?
x11 or png

> For my part, what I've observed is that whenever the map background is completely solid (i.e., solid landmass or solid ocean, etc.) the line appears. If there's a sliver of ocean present against a landmass, or the presence of islands in a plot of predominantly ocean, the line does not appear. I've been reliably able to produce and predict when/if it will occur, and for me it happens whether or not mpLandFillColor is set (in fact, I set it to a dark color to emphasize the diagonal when its present). It also happens regardless of workstation type.

same for me

> All this and some other experiments suggests to me its an artifact of our graphics subsystem, the nature and origin of which I don't understand at the moment. Thus I don't really have a work-around to offer, other than the line seems to be less visible (but not invisible) for the older postscript/pdf formats (device names "oldps", "oldpdf" with ncl 6.1.0, or just "ps", "pdf" with 6.0.0)
>
> I'm going to file a ticket on this one…
>
> Rick

on gsn_csm_contour_map, the problem doesn't seem to exist...

Ronny

>
>
> On Dec 18, 2012, at 3:01 PM, Ronny Berndt <ronny.berndt@uni-jena.de> wrote:
>
>> Hi,
>>
>> it seems that if you set the resource @mpLandFillColor the white line is gone.
>> Is @mpLandFillColor unset, the white line comes again...
>>
>> Ronny
>>
>> Am 18.12.2012 um 21:57 schrieb Rick Brownrigg:
>>
>>> That's interesting -- it shows up in every output format we support. I don't know why at the moment, but am checking in to it…
>>>
>>> Rick
>>>
>>> On Dec 18, 2012, at 12:43 PM, Ronny Berndt <ronny.berndt@uni-jena.de> wrote:
>>>
>>>> Hi,
>>>>
>>>> why is there a diagonal white line from the lower left corner to upper right?
>>>> How can I prevent this?
>>>>
>>>> ncl-script:
>>>>
>>>> load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"
>>>> load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_csm.ncl"
>>>>
>>>> begin
>>>>
>>>> wks_type = "png"
>>>> wks_name = "latlines"
>>>> wks = gsn_open_wks(wks_type, wks_name) ; Open a workstation.
>>>>
>>>> res = True
>>>> res@gsnFrame = False ; Don't draw or advance
>>>> res@gsnDraw = False ; frame yet.
>>>> res@gsnMaximize = True
>>>>
>>>>
>>>> ;---This will be our base, so make it a map plot.
>>>> ;res@tfDoNDCOverlay = False
>>>> ;res@gsnAddCyclic = False
>>>> res@mpProjection = "CylindricalEquidistant" ; Projection
>>>> res@mpOutlineOn = True
>>>> res@mpDataBaseVersion = "MediumRes"
>>>> res@mpOutlineBoundarySets = "AllBoundaries"
>>>> ;res@mpOutlineBoundarySets = "National" ; country borders
>>>> res@mpNationalLineThicknessF = 2.0
>>>> res@mpLimitMode ="LatLon"
>>>> res@mpMinLatF = -21.87
>>>> res@mpMaxLatF = -11.09
>>>> res@mpMinLonF = 14.21
>>>> res@mpMaxLonF = 25.87
>>>>
>>>> Map = gsn_csm_map(wks, res)
>>>>
>>>> pres = True ; polyline mods desired
>>>> pres@gsLineThicknessF = 2.0 ; line thickness
>>>> pres@gsLineColor = "blue" ; color of lines
>>>>
>>>> val = gsn_add_polyline(wks,Map,(/14.21,25.87/),(/-12.63,-12.63/),pres)
>>>>
>>>> draw(Map)
>>>> frame(wks)
>>>>
>>>> ;delete(res)
>>>>
>>>> ;make high density png with imagemagick
>>>> ;delete(wks)
>>>>
>>>> options = "mogrify -strip -trim -geometry 1000x1000 -density 300 -units pixelsperinch " + wks_name + ".png"
>>>> ;system(options)
>>>>
>>>> end
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>>
>

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Received on Tue Dec 18 15:48:46 2012