Re: Drawing streamlines freezes NCL script

Hi Samuel,

It is hard to tell what's going on as there are a number of streamline
resources
being set, any of which could be the problem.

Can you provide us with a full script and data so we can run it here?
You
can email me with this information offline.

Thanks,

--Mary

On Apr 15, 2009, at 6:59 PM, Samuel Leung wrote:

> Hello NCL team,
>
> I faced a problem overlaying streamlines on a map. I used
> gsn_csm_streamline to draw the streamlines.
>
> When I ran the ncl for generating the images, the ncl stopped at the
> line where gsn_csm_streamline is located, and the postscript file
> generated then became bigger and bigger in filesize. This status
> seemed not to have an end as I saw the filesize of the postscript file
> can reach in giga byte (normally a 10MB postscript is adequate for
> making the images I am working on). I needed to terminate the ncl by
> myself and no images were obtained.
>
> The scripts I used for the streamline are as follows. It is also in
> the end of the ncl.
> -----------------------
> ...
> plot = gsn_csm_vector_scalar_map(wks,
> uu,vv,rh,res)
>
> resS = True
> resS_at_gsnTickMarksOn = False
>
> resS_at_vpWidthF = 0.879
> resS_at_vpHeightF = 0.7
> resS_at_vpXF = 0.102
> resS_at_vpYF = 0.922
>
> resS_at_stMinStepFactorF = 2 ; 2
> resS_at_stLengthCheckCount = 4 ; 35
> resS_at_stCrossoverCheckCount = -1
> resS_at_stMinDistanceF = 0.2
> resS_at_stArrowLengthF = 0.01 ; changes the size of the
> arrows.
> resS_at_stLineThicknessF = 1.5 ; changes the line thickness
> resS_at_stMinArrowSpacingF = 0.3
>
> resS_at_stLineColor = "black" ; changes color
> resS_at_gsnRightString = ""
> resS_at_gsnLeftString = ""
> resS_at_gsnCenterString = ""
> ;resS_at_tfDoNDCOverlay = True
>
> plotS = gsn_csm_streamline(wks,uu,vv,resS)
> overlay(plot,plotS)
> draw(plot)
>
> frame(wks)
>
> end
> -----------------------
>
> I tried to comment the gsn_csm_streamline and the map itself can be
> generated successfully. I thought the streamline drawing part is the
> root cause of the problem.
>
> This problem can be skipped by setting a larger stMinDistanceF value
> but it will result as almost no streamlines drawn.
>
> The ncl version I am using is 4.2.0.a033. I also tried 5.0.0 but it
> looked like no difference.
>
> Thanks in advance for your help.
>
> Regards,
> Samuel Leung
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Received on Wed Apr 15 2009 - 22:52:08 MDT