Split points by polygon by specifying a field

[Rodrigo Saavedra]

Dear friends,

I am processing some data lidar and I would like to be able to divide the cloud of points of each polygon, for this I use lasclip adding as -split parameter.

However I export the .las files considering the attribute of the shapefile (fields: FID, KEY) called FID, my question is How could I indicate in the code to be able to export each .las with the name of another field (KEY) and not The FID?

This is an example code I am sending Martin and I am using:

Split the points of each pseudo plot polygon into separate files

>> lasclip -v -i ft _ *. Laz -merged -poly fn.shp -split -o plots.laz

Greetings and thanks

[Yogendra Karna]

Hi Rodrigo,

Thanks for asking this thread. I also want to do the exactly same things, I want the clipped las files to be written on the name of desired attribute of shapefile. The split function only takes the FID column so I would also like to ask Martin what and how should I add the attribute of shapefile after -split in the lasclip code that you mentioned in the following code and found in this link.

D:\LAStools\bin>lasclip -i ..\data\fusa.laz ^

                                   -poly buildings.shp ^

                                   -split ^

                                   -o single_buildings.laz

Thanks and Regards,

Yogendra

[Martin Isenburg]

Hello Rodrigo and Yogendra,

you may have already heard but I am cleaning out old unanswered forum posts. The functionality you ask for has been added as per this discussion thread:

https://groups.google.com/d/topic/lastools/J98e2AeTWuY/discussion

lasclip -i lotsoflidar/*.laz -merged ^

           -poly myplots.shp ^

           -split SomeName ^

           -odir outputplots ^

           -olaz

 

Or

 

lasclip -i lotsoflidar/*.laz -merged ^

           -poly myplots.shp ^

           -split 3 ^

           -odir outputplots ^

           -olaz

 

Where SomeName is the name of the string field with the output file name or 3 is the index of the string field (count starts at 0) in the DBF file.

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[Yogendra Karna]

Hi Martin,

I tried this code to clip my lidar data but didn't produce the output in the name of string field. I have tried several times with both options but it didn't work, once I could have done it successfully but this time couldn't. The code and error shows as follows:

F:\Softwares\LasToolsLIcense\LAStools\bin>lasclip -i *.las -drop_z_below 0 -poly SiteBoundaryAll.shp -split SiteID -odix _clip -olas

ERROR: cannot understand argument SiteID

F:\Softwares\LasToolsLIcense\LAStools\bin>lasclip -i *.las -merged -drop_z_below 0 -poly SiteBoundaryAll.shp -split 3 -odix _clip -olas

ERROR: cannot understand argument 3

I have also attached my shapefile which I used for clipping.

Thanks and Regards,

Yogendra

Yogendra K. Karna

PhD Student

School of Ecosystem and Forest Sciences

The University of Melbourne

Water St., Creswick, VIC 3363, Australia

T: +61 3 5321 4257

M: 0410 207 191

E: yka...@student.unimelb.edu.au

------------------------------------

Under-Secretary (Technical)

Ministry of Forests and Soil Conservation

Government of Nepal

[Martin Isenburg]

Hello,

I assume you are using an older version of LAStools where this option was not supported yet:

E:\LAStools\bin>lasclip -version

LAStools (by mar...@rapidlasso.com) version 180209 (academic)

Regards,

Martin