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  lasboundary: reads LIDAR data in the LAS format and computes
               a boundary polygon for the points. By default
               this is a concave hull of the points. For this
               it Delaunay triangulate the points into a TIN,
               deletes triangles with large edges from the
               boundary, and outputs the resulting boundary
               polygon. The output is either a list of line
               segments in ASCII format or an ESRI Shapefile. 
 
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example usage:

>> las2boundary -i lidar.las -o lidar_boundary.shp

computes the boundary of the LAS file 'lidar.las' and stores
the result to ESRI's Shapefile 'lidar_boundary.shp'

>> las2boundary -i lidar.las -o lidar_boundary.txt

the same but it stores the result to an ASCII file

>> las2boundary -i lidar.las -o lidar_boundary.shp -concave 100

the same but with creating less detailed concavities. the default
value for concavities is 50 (meaning edges along the convex hull
that are longer than 50 units get "pushed" inwards)

C:\lastools\bin>lasboundary -h
usage:
lasboundary -i lidar.las -o boundary.shp
lasboundary -i lidar.las -o boundary.txt
lasboundary -i lidar.las -o boundary.shape -concave 100 (default is 50)
lasboundary -i lidar.las -first_only -o boundary.shp
lasboundary -i lidar.las -last_only -o boundary.shp
lasboundary -i lidar.las -last_only -keep_class 2 -keep_class 3 -keep_class 9 -o boundary.shp
lasboundary -h

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if you find bugs let me (isenburg@cs.unc.edu) know.