NAME

txt2las - converts LIDAR data from ASCII format into LAS representation

SYNOPSIS

txt2las
[-h | -parse tsxyz lidar.txt | -parse txyzar lidar.txt.gz lidar.laz | -parse xyz [-scale 0.02 ] -i lidar.txt -o lidar.laz | -parse xyzsst [-verbose] [-scale 0.05] lidar.txt | -parse xsysz [-xyz_scale 0.02 0.02 0.01] lidar.txt ]

DESCRIPTION

txt2las converts LIDAR data from a standard ASCII format into the more efficient binary LAS representation.

OPTIONS

-h

produce help message

-parse arg

Parsing Flags

The '-parse tsxyz' flag specifies how to interpret each line of the ASCII file.

For example, 'tsxyzssa' means that the first number is the gpstime, the next number should be skipped, the next three numbers are the x, y, and z coordinate, the next two should be skipped, and the next number is the scan angle.

The other supported entries are:

-scale arg

Scale

The '-scale 0.02' flag specifies the quantization.

The default value of 0.01 means that the smallest increment two between coordinates is 0.01.

If measurements are in meters this corresponds to centimeter accuracy, which is commonly considered sufficient for LIDAR data.

-i arg

input LAS file.

-o arg

output text file.

-xyz_offset 500000 2000000 0

-xyz_scale 0.02 0.02 0.01

-file_creation 67 2003

-system_identifier "Airborne One Leica 50,000 Hz"

-generating_software "TerraScan"

EXAMPLE

Simple conversion to text file

$ txt2las -i lidar.las -o lidar.txt -parse xyz


      

converts LAS file to ASCII and places the x, y, and z coordinate of each point at the 1st, 2nd, and 3rd entry of each line. The entries are separated by a space.

$ txt2las -i lidar.taxyz -o lidar.las -parse ssxyz


      

converts ASCII file and uses the 3rd, 4th, and 5th entry of each line as the x, y, and z coordinate of each point.

$ txt2las -i lidar.txt.gz -o lidar.las -parse txyzsa


      

converts a gzipped ASCII file and uses the 1st entry of each line as the gps time, the 3rd, 4th, and 5th entry as the x, y, and z coordinate of each point, and the 6th entry as the scan angle