created with command line: spfinalize -i new_orleans.files -ilas -lof -ospb | spdelaunay2d -ispb -osmb | tin2dem -ismb -opng -zone 15R -step 2 -kill 20000 -ellipse 11 -tiling_ns new_orleans 500 -ll 777250 3308000 data available here: http://atlas.lsu.edu/lidar/ (search for new orleans) http://www.cs.unc.edu/~isenburg/googleearth/raster/new_orleans/new_orleans.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/