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v.out.lidar(1) Grass User's Manual v.out.lidar(1)

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

vector, export, LIDAR, points

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] [--verbose] [-- quiet] [--ui]

-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

input=name [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=name [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 access 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 access 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 access 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 access 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=float [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=float [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

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 extent (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.

The typical file extensions for the LAS format are .las and .laz (compressed). The compressed LAS (.laz) format can be exported only if libLAS has been compiled with LASzip support. It is also good when libLAS was compiled with GDAL. This is needed when working with projections.

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

ASPRS LAS format
 
LAS library
 

Vaclav Petras
Last changed: $Date: 2015-12-22 02:31:02 +0100 (Tue, 22 Dec 2015) $

Available at: v.out.lidar source code (history)
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© 2003-2018 GRASS Development Team, GRASS GIS 7.4.3 Reference Manual
GRASS 7.4.3

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