txt2las(1) converts LIDAR data from ASCII format into LAS representation


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 ]


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


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:

  • i - intensity
  • n - number of returns of given pulse
  • r - number of return
  • c - classification
  • u - user data
  • p - point source ID
  • e - edge of flight line flag
  • d - direction of scan flag.
-scale arg

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"


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