v.in.pdal - GRASS GIS manual

Note: This document is for an older version of GRASS GIS that will be discontinued soon. You should upgrade, and read the current manual page.

NAME

v.in.pdal - Converts LAS LiDAR point clouds to a GRASS vector map with PDAL.

KEYWORDS

vector, import, LIDAR

SYNOPSIS

v.in.pdal

v.in.pdal --help

v.in.pdal [-wocrjkhm] input=name output=name [id_layer=string] [return_layer=string] [class_layer=string] [rgb_layer=string] [spatial=xmin,ymin,xmax,ymax] [zrange=min,max] [return_filter=string] [class_filter=integer[,integer,...]] [input_srs=string] [max_ground_window_size=float] [ground_slope=float] [max_ground_distance=float] [initial_ground_distance=float] [ground_cell_size=float] [--overwrite] [--help] [--verbose] [--quiet] [--ui]

Flags:

-w: Reproject to location's coordinate system if needed; Reprojects input dataset to the coordinate system of the GRASS location (by default only datasets with the matching cordinate system can be imported
-o: Override projection check (use current location's projection); Assume that the dataset has same projection as the current location
-c: Do not automatically add unique ID as category to each point; Create only requested layers and categories
-r: Limit import to the current region
-j: Classify and extract ground points; This assignes class 2 to the groud points
-k: Classify ground points
-h: Compute height for points as a difference from ground; This requires points to have class 2
-m: Use approximate algorithm in ground filter
--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]: LAS input file; LiDAR input files in LAS format (*.las or *.laz)
output=name [required]: Name for output vector map
id_layer=string: Layer number to store generated point ID as category; Set to 1 by default, use -c to not store it
return_layer=string: Layer number to store return information as category; Leave empty to not store it
class_layer=string: Layer number to store class number as category; Leave empty to not store it
rgb_layer=string: Layer number where RBG colors are stored as category; Leave empty to not store it
spatial=xmin,ymin,xmax,ymax: Import subregion only; Format: xmin,ymin,xmax,ymax - usually W,S,E,N
zrange=min,max: Filter range for z data (min,max)
return_filter=string: Only import points of selected return type; If not specified, all points are imported; Options: first, last, mid
class_filter=integer[,integer,...]: Only import points of selected class(es); Input is comma separated integers. If not specified, all points are imported.
input_srs=string: Input dataset projection (WKT or EPSG, e.g. EPSG:4326); Override input dataset coordinate system using EPSG code or WKT definition
max_ground_window_size=float: Maximum window size for ground filter; Default: 33
ground_slope=float: Slope for ground filter; Default: 1.0
max_ground_distance=float: Maximum distance for ground filter; Default: 2.5
initial_ground_distance=float: Initial distance for ground filter; Default: 0.15
ground_cell_size=float: Initial distance for ground filter; Default: 1

DESCRIPTION
EXAMPLES
SEE ALSO
REFERENCES
AUTHOR

DESCRIPTION

v.in.pdal supports the following PDAL filters:

groud detection with Point Cloud Library (PCL) Progressive Morphological Filter (Zhang 2003) (filters.ground)
filters.height (requires PCL)

v.in.pdal supports the following filters natively:

2D region filter
Z coordinates filter
return filter
class filter

EXAMPLES

Import only XYZ coordinates of points, limit the import to the current computational region and reproject to the Location projection during the import:

v.in.pdal input=points.las output=points -c -r -w

REFERENCES

V. Petras, A. Petrasova, J. Jeziorska, H. Mitasova (2016): Processing UAV and lidar point clouds in GRASS GIS. XXIII ISPRS Congress 2016 [ISPRS Archives, ResearchGate]
Zhang, Keqi, et al. A progressive morphological filter for removing nonground measurements from airborne LIDAR data. Geoscience and Remote Sensing, IEEE Transactions on 41.4 (2003): 872-882.

AUTHOR

Vaclav Petras, NCSU GeoForAll Lab

SOURCE CODE

Available at: v.in.pdal source code (history)

Latest change: Tue Apr 7 03:18:14 2020 in commit: 73b37a7dfb2d068e0734ca858e1f330a74f094e7