[GRASS-dev] Re: [GRASS-user] LiDAR LAS import
markus.metz.giswork at googlemail.com
Fri Jun 3 02:20:40 EDT 2011
> Markus Metz wrote:
>> v.in.lidar is a notch faster than las2txt | v.in.ascii. And
>> easier to use...
> I'm not too surprised the speed difference is not so huge, as
> unix pipes are very efficient. but the easier to use thing is
> very important.. both las2txt and v.in.ascii are a bundle of
> command line switches to get right.
>> Speed comparisons:
>> # sample las file with 1,287,775 points
>> # with table and topology
>> real 6m34.430s
>> real 6m13.823s
>> # without table, with topology
>> real 1m53.578s
>> real 1m44.876s
> I take it that without topology it runs in just seconds?
Update: no attribute table, no topology
time las2txt -i points.las --stdout --parse xyz --delimiter "|" |
v.in.ascii in=- out=points_ascii -ztb x=1 y=2 z=3
time v.in.lidar in=points.las out=points_las -obt
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