The -r flag limits the export to the current computational region extent (see g.region). The where option limits the export by attributes (applied only when the columns are used for export).
LAS format stores the coordinates as integers rounding the decimal places. Before that a scale is applied to preserve a certain number of decimal places. This scale can be set using las_xyscale and las_xscale options. For example, the scale value 0.01 will preserve two decimal places while the value 1.0 will preserve none.
g.region raster=elevation res=100 r.surf.fractal output=fractals r.to.vect input=fractals output=fractals type=point -z v.out.lidar input=fractals output=fractals.las
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