Creates and draws a streamline plot, using a scalar field to color the streamlines.
Available in version 6.3.0 and later.
load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl" load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_csm.ncl" function gsn_csm_streamline_scalar ( wks  : graphic, u [*][*] : numeric, v [*][*] : numeric, data [*][*] : numeric, res  : logical ) return_val  : graphic
The u and v data for the streamline plot; must be two-dimensional.data
The data field for which to color the streamlines by; must be one- or two-dimensional.res
A variable containing an optional list of plot resources, attached as attributes. Set to True if you want the attached attributes to be applied, and False if you either don't have any resources to set, or you don't want the resources applied.
A scalar id of the streamline plot created is returned. The id of the streamline data object is returned as an attribute called vfdata, and the id of the scalar data object is returned as an attribute called sfdata. These ids are useful if you want to use setvalues to change some data or plot options after this function has been called.
This function creates and draws a streamline plot. The scalar field is used to color the streamlines. Note that the gsnScalarContour resource is NOT recognized by this routine. See gsn_csm_streamline_contour_map instead.
If you want to turn the labelbar off, set lbLabelBarOn to False.
If u, v, or data have a _FillValue attribute, these values will be used as missing values.
If u has an attribute called "long_name", and gsnLeftString hasn't explicitly been set, then the value of this attribute is used for the left string title.
If u has an attribute called "units", and gsnRightString hasn't explicitly been set, then the value of this attribute is used for the right string title.
To maximize the area that the plot is drawn in, set the special resource gsnMaximize to True.
gsn_csm_streamline, gsn_csm_streamline_contour_map, gsn_csm_streamline_contour_map_polar, gsn_csm_streamline_map, gsn_csm_streamline_scalar_map, gsn_csm_streamline_scalar_map_polar, gsn_csm_streamline_map_polar, gsn_streamline, gsn_streamline_scalar, gsn_streamline_scalar_map, gsn_streamline_map, gsn_csm_pres_hgt_streamline
Special gsn resources
;---Read in 2D data only uvf = addfile("$NCARG_ROOT/lib/ncarg/data/cdf/941110_UV.cdf","r") pf = addfile("$NCARG_ROOT/lib/ncarg/data/cdf/941110_P.cdf","r") u = uvf->u v = uvf->v p = pf->Psl ;---Send graphics to an X11 window wks = gsn_open_wks("x11","streamlines") ;---Set some plotting resources res = True ; plot mods desired res@gsnMaximize = True res@gsnAddCyclic = False res@stLevelPalette = "SVG_Lindaa07" res@stLineThicknessF = 3.0 res@tiMainString = "Example of a streamline/scalar plot" res@lbOrientation = "Vertical" res@stLevelSelectionMode = "ExplicitLevels" res@stLevels = ispan(950,1040,5) ; default is a spacing of 10 plot = gsn_csm_streamline_scalar(wks,u,v,p,res)