gsn_contour_map

Creates and draws a contour plot over a map.

Prototype

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

	function gsn_contour_map (
		wks [1] : graphic,  
		data    : numeric,  
		res [1] : logical   
	)

	return_val [1] :  graphic

Arguments

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

The data to contour.

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.

Return value

A scalar id of the map created is returned. The id of the contour plot is returned as an attribute called contour, and the id of the data is returned as an attribute called data. This is useful if you want to use setvalues to change some data or contour options after this function has been called.

Description

This function creates and draws a contour plot over a map on the given workstation.

If data is two-dimensional, then a contour plot is generated in the usual way.

If data is one-dimensional, then res@sfXArray and res@sfYArray must also be set to one-dimensional arrays of the same length, and a triangulation algorithm will be used to generate the contours.

If data has a _FillValue attribute, this value will be used as a missing value. If data has a long_name attribute, this value will be used as the main title.

You should use gsn_csm_contour_map if you want a more customized contour plot and/or if your data has coordinate arrays.

See Also

gsn_contour

Examples

For some application examples, see:

• "rcm_4.ncl" (view example)
• "sat_1.ncl" (view example)
• "sat_2.ncl" (view example)