bionic (1) v.out.lidar.1grass.gz

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, 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]  [--verbose]  [--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=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

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  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.

NOTES

       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.

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

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

SOURCE CODE

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

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       © 2003-2018 GRASS Development Team, GRASS GIS 7.4.0 Reference Manual