Extracting Building footprint polygon using Las Tools

[Florina Dutt]

Hi , 

I would like to know how I would extract just building footprint polygon from Lidar point cloud data? 

I do not need the entire building shape polygon that might be possible using las Boundary tool but just footprint polygons. If anyone could explain me the possible steps it would be really helpful. 

[Martin Isenburg]

Hello,

with lasboundary you can extract polygons of where buildings are when you have a the points corresponding to buildings (or their roofs) classified in the point cloud. You will not get simple, rectified polygons but - depending on the density and the quality of your input you can get reasonable results as shown in the attached images. I also attach the two (well documented) scripts that were used to do the classification and the derivative extraction. A similar workflow for larger inputs is described here:

https://rapidlasso.com/2013/10/13/tutorial-lidar-preparation/
https://rapidlasso.com/2013/10/20/tutorial-derivative-production/

Regards,

Martin @rapidlasso

PS: Want to meet rapidlasso GmbH in person and talk LiDAR, photogrammetry points and LAStools? See our upcoming event schedule here: http://rapidlasso.com/events

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