created with command line:

spfinalize -i TO_core_last.las -ospb | \
spdelaunay2d -ispb -osmb | \
tin2dem -ismb -opng -zone 17S -ellipse 23 -step 0.5 -kill 1000 -tiling_ns toronto 500 -ll 629750 4834000

data available here:

http://www.geoict.net/LidarData/Data/OptechSampleLAS.zip

download executables and sources here:

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