Re: vector plot

Hi Chao,

sfXArray and sfYArray apply to scalar fields. The corresponding resources to use for vector fields are vfXArray and vfYArray.
 -dave

On Apr 8, 2011, at 4:30 PM, Chao Luo wrote:

> Hi,
>
> I am trying to plot wind vector. What I am doing is to read U and V from ascii data file and read 2D lat and lon, and use
> res@sfXArray = lon2d
> res@sfYArray = lat2d
> the error message like:
> warning:sfXArray is not a valid resource in vector_vector at this time
> warning:sfYArray is not a valid resource in vector_vector at this time
>
> How to set lat and lon attributes to U and V, since U and V read from ASCII data file?
>
> here is my short script
>
> --------------------------------------
> ;***************************************************************************
> ; tstvec_1.ncl
> ;
> ;***************************************************************************
> load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"
> load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_csm.ncl"
> ;load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/shea_util.ncl"
> load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/contributed.ncl"
>
> procedure metaUtil (z[*][*][*]:numeric, time[*], lat[*], lon[*])
>
> begin
> z!0 = "time" ; name dimensions
> z!1 = "lat"
> z!2 = "lon"
> z&time = time ; assign coordinate variables
> z&lat = lat
> z&lon = lon
> end
>
>
> begin
> f = addfile ("GRIDCRO2D_4km.20060101.nc", "r")
> lat2d = f->LAT(0,0,:,:)
> lon2d = f->LON(0,0,:,:)
>
> ;;;; read model simulated IC2CG data
> lat_nbr = 100
> lon_nbr = 142
> ;;; read ASCII data
>
> uw = asciiread("/data12/cluo/cmaq4.6/data/post/4km/dat/uu_sfc_dot.dat", (/lat_nbr,lon_nbr/),"float")
> vw = asciiread("/data12/cluo/cmaq4.6/data/post/4km/dat/vv_sfc_dot.dat", (/lat_nbr,lon_nbr/),"float")
>
> ;*************create plots*******************
> wks = gsn_open_wks ("ps", "vector") ; open workstation
> gsn_define_colormap(wks,"BlAqGrYeOrRe") ; choose colormap
> res = True ; plot mods desired
> res@gsnDraw = False ; Don't draw plot or advance the
> res@gsnFrame = False ; frame after plot is created.
> res@gsnFrame = False ; so we can draw time stamp
> res@vcRefAnnoOrthogonalPosF = -1.0 ; move ref vector up
> res@vcRefMagnitudeF = 10.0 ; define vector ref mag
> res@vcRefLengthF = 0.045 ; define length of vec ref
> res@vcGlyphStyle = "CurlyVector" ; turn on curly vectors
> res@vcMinDistanceF = 0.017
> res@sfXArray = lon2d
> res@sfYArray = lat2d
> res@mpLimitMode = "Corners"
> res@mpLeftCornerLatF = lat2d(0,0)
> res@mpLeftCornerLonF = lon2d(0,0)
> res@mpRightCornerLatF = lat2d(99,141)
> res@mpRightCornerLonF = lon2d(99,141)
>
> vector = gsn_csm_vector_map_ce(wks,uw,vw,res)
> frame (wks)
> end
>
> --------------------------------------------------
> Thanks,
> Chao
>
>
> Thanks,
>
> Chao
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Received on Sat Apr 9 08:55:17 2011