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wrf_user_intrp2d

Interpolates ARW WRF 2D model data along a give line.

Prototype

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

	function wrf_user_intrp2d (
		var2d   : numeric,  
		loc [*] : numeric,  ; up to four values
		angle   : numeric,  
		res [1] : logical   
	)

	return_val  :  numeric

Arguments

var2d

Data that will be interpolated. The rightmost dimensions of this array is ny x nx.

loc

Interpolation information. Can contain up to four scalar values.

Use 2 values if extracting a line through a given point on the model domain. The two values represent the x/y location through which the line will pass. Must also specify angle in this case.

Use 4 values if extracting data from point A to point B. The 4 values represent the x/y locations of points A and B.

angle

Only valid if a lne will be extracted through a given point on the model domain. 0.0 represents S-N and 90.0 W-E.

res

Set to True if extracting a line from point A to point B; otherwise set to False.

Return value

Data interpolated to a specified line on the model domain.

Description

This function interpolates 2D model data onto a specfied line.

wrf_user_intrp2d is part of a library of functions and procedures in WRFUserARW.ncl written to help users plot ARW WRF model data.

Questions on this function should be sent to wrfhelp@ucar.edu.

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")

  t2 = wrf_user_getvar(a,"T2",-1)        ; get T2 data for all time periods

  dims = dimsizes(t2)

  plane = (/ dims(2)/2, dims(1)/2 /)       ; pivot point (x,y) through center of domain   
  angle = 90.                              ; plot from west to east
  opts = False                             ; start and end point not supplied

  X_plane = wrf_user_intrp2d(t2,plane,angle,opts)

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