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v.out.lidar(1)		    GRASS GIS User's Manual		v.out.lidar(1)

NAME
       v.out.lidar  - Exports vector points as LAS point cloud
       Converts	LAS LiDAR point	clouds to a GRASS vector map with libLAS

KEYWORDS
       vector, export, output, LIDAR, points

SYNOPSIS
       v.out.lidar
       v.out.lidar --help
       v.out.lidar [-rw] input=name  [layer=string]  output=name  [cats=range]
       [where=sql_query]	[id_layer=string]	 [return_layer=string]
       [class_layer=string]	  [rgb_layer=string]	  [return_column=name]
       [n_returns_column=name]	    [class_column=name]	     [rgb_column=name]
       [red_column=name]	 [green_column=name]	    [blue_column=name]
       las_xyscale=float las_zscale=float   [--overwrite]   [--help]   [--ver-
       bose]  [--quiet]	 [--ui]

   Flags:
       -r
	   Limit export	to the current region

       -w
	   Ignore color	table
	   Ignore color	table even when	set and	not other options are present

       --overwrite
	   Allow output	files to overwrite existing files

       --help
	   Print usage summary

       --verbose
	   Verbose module output

       --quiet
	   Quiet module	output

       --ui
	   Force launching GUI dialog

   Parameters:
       input=nameA [required]
	   Name	of input vector	map
	   Or data source for direct OGR access

       layer=string
	   Layer number	or name	('-1' for all layers)
	   A  single  vector map can be	connected to multiple database tables.
	   This	number determines which	table to use. When  used  with	direct
	   OGR access this is the layer	name.
	   Default: -1

       output=nameA [required]
	   Name	for output file

       cats=range
	   Category values
	   Example: 1,3,7-9,13

       where=sql_query
	   WHERE conditions of SQL statement without 'where' keyword
	   Example: income < 1000 and population >= 10000

       id_layer=string
	   Layer number	to store generated point ID as category
	   Vector  features can	have category values in	different layers. This
	   number determines which layer to use. When used with	direct OGR ac-
	   cess	this is	the layer name.

       return_layer=string
	   Layer number	to store return	number as category
	   Vector  features can	have category values in	different layers. This
	   number determines which layer to use. When used with	direct OGR ac-
	   cess	this is	the layer name.

       class_layer=string
	   Layer number	to store class number as category
	   Vector  features can	have category values in	different layers. This
	   number determines which layer to use. When used with	direct OGR ac-
	   cess	this is	the layer name.

       rgb_layer=string
	   Layer number	where RGB color	is stored as category
	   Vector  features can	have category values in	different layers. This
	   number determines which layer to use. When used with	direct OGR ac-
	   cess	this is	the layer name.

       return_column=name
	   Column with return number
	   Name	of attribute column

       n_returns_column=name
	   Column with return number
	   Name	of attribute column

       class_column=name
	   Column with return number
	   Name	of attribute column

       rgb_column=name
	   RGB color definition	column
	   Color definition in R:G:B form

       red_column=name
	   Column with red color
	   Name	of attribute column

       green_column=name
	   Column with green color
	   Name	of attribute column

       blue_column=name
	   Column with blue color
	   Name	of attribute column

       las_xyscale=floatA [required]
	   Internal scale to apply to X	and Y values
	   This	scale does not change the values itself	but only how precisely
	   they	are stored, for	example	0.01 will preserve two decimal places
	   Default: 0.01

       las_zscale=floatA [required]
	   Internal scale to apply to z	values
	   This	scale does not change the values itself	but only how precisely
	   they	are stored, for	example	0.01 will preserve two decimal places
	   Default: 0.01

DESCRIPTION
       v.out.lidar  converts  GRASS  vector map	to a LiDAR point clouds	in LAS
       format using the	libLAS library.

       The -r flag limits the export to	the current computational  region  ex-
       tent  (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.

NOTES
       The typical file	extensions for the LAS format are .las and .laz	 (com-
       pressed).  The compressed LAS (.laz) format can be exported only	if li-
       bLAS has	been compiled with LASzip support.  It is also good  when  li-
       bLAS  was  compiled with	GDAL. This is needed when working with projec-
       tions.

EXAMPLE
       Generate	fractal	surface	and export is as point in LAS format:
       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

REFERENCES
       ASPRS LAS format
       LAS library

AUTHOR
       Vaclav Petras

SOURCE CODE
       Available at: v.out.lidar source	code (history)

       Main index | Vector index | Topics index	| Keywords index  |  Graphical
       index | Full index

       A(C) 2003-2020 GRASS Development	Team, GRASS GIS	7.8.5 Reference	Manual

GRASS 7.8.5							v.out.lidar(1)

NAME | KEYWORDS | SYNOPSIS | DESCRIPTION | NOTES | EXAMPLE | REFERENCES | AUTHOR | SOURCE CODE

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