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wrf_contour

Creates a contour plot from ARW WRF model output.

Available in version 4.3.1 or later.

Prototype

load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"
load "$NCARG_ROOT/lib/ncarg/nclscripts/wrf/WRFUserARW.ncl"

	function wrf_contour (
		nc_file     : file,     
		wks         : graphic,  
		data [*][*] : numeric,  
		res         : logical   
	)

	return_val [1] :  graphic

Arguments

nc_file

Input netCDF file name.

wks

An NCL Workstation identifier. The identifier is one returned either from calling gsn_open_wks or calling create to create a Workstation object.

data

A two-dimensional array to be contoured.

res

A variable containing an optional list of plot resources, attached as attributes.

Return value

A scalar id of the plot created is returned.

Description

This function creates and draws a contour plot.

If data has a _FillValue attribute, this value will be used as a missing value.

If data has a "description" attribute, this value will be used in the plot title.

wrf_contour is part of a library of functions and procedures in WRFUserARW.ncl written to help users plot ARW WRF model data.

WRF-related questions should be sent to wrfhelp@ucar.edu.

See Also

wrf_vector, wrf_map_overlays, wrf_overlays, wrf_map

Examples

Example 1

  load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"
  load "$NCARG_ROOT/lib/ncarg/nclscripts/wrf/WRFUserARW.ncl"

  a = addfile("wrfout_d01_2000-01-24_12:00:00.nc","r")

  wks = gsn_open_wks("x11","test")

  ter = wrf_user_getvar(a,"HGT",0)   ; Get terrain height for time 0

  res = True
  res@cnFillOn = True
  contour = wrf_contour(a,wks,ter,res)

You can see some other example scripts and their resultant images at:

http://www.mmm.ucar.edu/wrf/OnLineTutorial/Graphics/NCL/