[GRASS-user] "raised field" objects : how to extract and export ?

[dandrigo]

Dear all, 

I m working on windows 10. 
In input, i have a .LAS "GROUND_only" lidar point cloud (4 millions points). 
We 're interested in geomorphological microstructures called raised field
(ground elevation due to cultivated areas ). 
I attach a SS representing this cloud file. 

<http://osgeo-org.1560.x6.nabble.com/file/n5313524/ss_cloud_lidar_GROUND_only.jpg> 


1/ We would like to classify our input ground point cloud in order to
separate the points constuing those "raised field"  and other ground points
"NON ground raised field" points. 
2/ Once the classification will done, we would like to be able to export the
result toward an new .las or shp (ideally with usefull attribute information
like class_id, z value, etc.). 
We would like generate a Multipoint layer only for those "raised field
objects". All the points constituing an object "raised field" must be strore
into the same row( entity). 

Could you tell me how to that? 

In advance, thank you very much.!



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