created with command line:

spfinalize -i fitchburg.files -ilof -ilas -ospb | \
spdelaunay2d -ispb -osmb | \
tin2dem -ismb -opng -zone 19S -ellipse 11 -step 0.5 -kill 1000 -tiling_ns fitchburg 500 -ll 272000 4714000

data available here:

http://www.qcoherent.com/data/LP360_Sample_Data.rar
http://www.cs.unc.edu/~isenburg/googleearth/raster/fitchburg/fitchburg.files

download executables and sources here:

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