created with command line:

spfinalize -i saint_helens.files -ilof -ilas -ospb -level 8 | \
spdelaunay2d -ispb -osmb | \
tin2iso -ismb -kill 500 -range 500 2500 50 -oslb | \
slclean -islb -oslb -length 5 | \
slsimp -islb -oslb -area 1 | \ 
sl2sl -islb -okml -tiling_nllsxy c:\kml_tiles\saint_helens 550000 5110000 10000 2 2 -utm 10S -ellipsoid 23

data available here:

http://wagda.lib.washington.edu/data/type/elevation/lidar/st_helens/toutle03.html
http://www.cs.unc.edu/~isenburg/googleearth/contour/saint_helens/saint_helens.files

converted to LAS format with LAStools available here:

http://www.cs.unc.edu/~isenburg/lastools/

download executables and sources here:

http://www.cs.unc.edu/~isenburg/googleearth/