[ncl-talk] plot masked vectors

[Michele Petrini - CITG]

Hi Adam,

thank you for the reply.

However, even setting the resource I don’t get rid of the tiny vectors. Below the resources I set for vector plot


        res_vc                            = res

        res_vc at vcRefMagnitudeF           = 20.             ; define vector ref mag
        res_vc at vcRefLengthF              = 0.01          ; define length of vec ref
        res_vc at vcRefAnnoArrowLineColor   = "black"         ; change ref vector color
        res_vc at vcRefAnnoArrowUseVecColor = False           ; don't use vec color for ref
        res_vc at vcGlyphStyle            = "CurlyVector"     ; turn on curly vectors
        res_vc at vcLineArrowColor        = "white"           ; change vector color
        res_vc at vcLineArrowThicknessF   = 2.5           ; change vector thickness
        res_vc at vcVectorDrawOrder       = "Draw"        ; draw vectors last
        res_vc at tfDoNDCOverlay         = True
        res_vc at vcMinDistanceF             = 0.017
        res_vc at vcMinFracLengthF         = 0.0
res_vc at vcMinMagnitudeF            = 300.

any thoughts?

thanks!

******************************************************************
Michele Petrini, PhD

Department of Geoscience and Remote Sensing, TUDelft
Delft, The Netherlands

M.Petrini at tudelft.nl<mailto:M.Petrini at tudelft.nl>
+39 3398367372
michele.petrins (Skype alias)



On 31 May 2018, at 00:48, Adam Phillips <asphilli at ucar.edu<mailto:asphilli at ucar.edu>> wrote:

Hi Michele,
Yes there is. Try setting vcMinMagnitudeF:
http://www.ncl.ucar.edu/Document/Graphics/Resources/vc.shtml#vcMinMagnitudeF

Three examples use this resource:
http://www.ncl.ucar.edu/Applications/res_list.shtml#vcMinMagnitudeF

Hope that helps!
Adam



On Wed, May 30, 2018 at 4:38 PM, Michele Petrini - CITG <M.Petrini at tudelft.nl<mailto:M.Petrini at tudelft.nl>> wrote:
Dear helpdesk,

I am trying to plot velocity vectors over a contour (+other stuff, see attached pdf).

I have a question, is there a way to mask out the small vectors and leave only velocity vectors exceeding some threshold (let’s say 100 m/yr)?

If I try to mask the u/v variables, I get an error.

Looking on the internet, I see that there is someone suggesting to overlay two vector contours, but the procedure seems to be a little bit complicated, and I wonder if there exists a simpler way,..

thanks!
Michele


******************************************************************
Michele Petrini, PhD

Department of Geoscience and Remote Sensing, TUDelft
Delft, The Netherlands

M.Petrini at tudelft.nl<mailto:M.Petrini at tudelft.nl>
+39 3398367372
michele.petrins (Skype alias)




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--
Adam Phillips
Associate Scientist,  Climate and Global Dynamics Laboratory, NCAR
www.cgd.ucar.edu/staff/asphilli/<http://www.cgd.ucar.edu/staff/asphilli/>   303-497-1726

<http://www.cgd.ucar.edu/staff/asphilli>

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