kml contour plot

This function can be called exactly the same as one would call MATLAB's CONTOUR function. It directly calls CONTOUR and then takes the output and converts it into a KML file, so that the contour lines display nicely and natively in Google Earth.

NOTE:
If you want to change the color and/or width of the contour lines, you will have to edit lines 38-40 of the function. There are some comments there to guide you.

Syntax:
KML_CONTOUR(LON,LAT,Z) writes contour lines in the same format as
matlab's CONTOUR(LON,LAT,Z) or CONTOURC(LON,LAT,Z).
KML_CONTOUR(LON,LAT,Z,N) draws N contour lines, overriding the
automatic value
KML_CONTOUR(LON,LAT,Z,V) draws LENGTH(V) contour lines at the values
specified in the vector V
KML_CONTOUR(LON,LAT,Z,[v v]) computes a single contour at the level v

Input:
LON: This can be either a matrix the same size as Z or a vector with
length the same as the number of columns in Z.
LAT: This can be either a matrix the same size as Z or a vector with
length the same as the number of rows in Z.
Z: Matrix of elevations

Output:
This function creates a kml file called 'doc.kml' in the current
working directory

for anyone interested, I also have a version written in Python available here:
http://www.cameronsparr.com/pytools/