[ncl-talk] gsn_csm_vector_scalar can't color at right speed

[Mary Haley]

The thing to remember about vector and contour levels both is that they
represent values between colors, and not exactly equal to colors.

I'm not sure what you mean by "but the color is less than the speed. It is
at too low class at speed about ."  Can you please describe your problem
another way, and may include an image and explain what you think is wrong
about it?

Thanks,

--Mary


On Fri, Oct 10, 2014 at 6:40 AM, chenxiaochen <chenxiaochen at aliyun.com>
wrote:

> dear nc-talk everyone~
>     I found a problem when I use gsn_csm_vector_scalar . I use CurlyVector
> ,  I set res at vcLevelSelectionMode = "ManualLevels"  and res at vcMaxLevelValF
> = 15 to control the color of vectors,but the color is less than the speed.
> It is at too low class at speed about . if  I  remove these item or use
> another vector style  it colored well.please help me，maybe it's a bug.
> my script
>
> load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"
> load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_csm.ncl"
> begin
> f1 = addfile("~/ncl/uwnd.mon.ltm.nc","r")
> f2 = addfile("~/ncl/vwnd.mon.ltm.nc","r")
> level=925
> wks_type = "pdf"
> wks=gsn_open_wks(wks_type,"003")
> u=f1->uwnd(6,925,:,:)
> v=f2->vwnd(6,925,:,:)
> speed=u
> speed=sqrt(u^2+v^2)
>
> vres = True
> vres at vcLevelPalette = "ncl_default"
>
> vres at vcLevelSelectionMode = "ManualLevels"
> vres at vcMaxLevelValF = 20
>
> vres at vcGlyphStyle = "CurlyVector"
> vres at vcRefMagnitudeF = 5.0 ; make vectors larger
> vres at vcRefLengthF = 0.050 ; ref vec length
> vres at vcMinDistanceF = 0.02 ; thin out vectors
> vres at vcRefAnnoOn = True
> plot = gsn_csm_vector_scalar_map_ce(wks,u,v,speed, vres)
> end
>
>
>
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