root/trunk/doc/las2txt.txt
| Revision 1159, 4.1 kB (checked in by hobu, 3 months ago) | |
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las2txt
| Author: | Martin Isenburg |
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| Contact: | isenburg@cs.unc.edu |
| Author: | Howard Butler |
| Contact: | hobu.inc@gmail.com |
| Revision: | $Revision$ |
| Date: | $Date$ |
Contents
Description
:ref:`las2txt` allows you to output ASRPS LAS files into ASCII text.
Usage
C:\lastools\bin>las2txt -h usage: las2txt lidar.las las2txt -parse xyziar lidar.las lidar.txt las2txt -i lidar.las -o lidar.laz -parse xyz las2txt -parse xyzt -verbose lidar.las las2txt -parse xyz lidar.las.gz las2txt -h
The '-parse txyz' flag specifies how to format each each line of the ASCII file. For example, 'txyzia' means that the first number of each line should be the gpstime, the next three numbers should be the x, y, and z coordinate, the next number should be the intensity and the next number should be the scan angle.
Supported entries
- a - scan angle
- i - intensity,
- n - number of returns for given pulse
- r - number of this return
- c - classification
- u - user data
- p - point source ID
- e - edge of flight line flag
- d - direction of scan flag
- R - red channel of RGB color
- G - green channel of RGB color
- B - blue channel of RGB color
- M - vertex index number
Separators
The '-sep space' flag specifies what separator to use. The default is a space. The following list is valid for separator characters (case sensitive):
- tab
- comma
- colon
- hyphen
- dot
- semicolon
Header Separators
The '-header pound' flag results in the header information being printed at the beginning of the ASCII file in form of a comment that starts with the special character '#'. Other possible special characters include (case sensitive):
- percent
- dollar
- semicolon
- comma
- star
- colon
- semicolon
Examples
Simple conversion to text file
$ las2txt -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.
Specifying a separator
$ las2txt -i lidar.las -o lidar.txt -parse txyzr -sep komma
converts LAS file to ASCII and places the gps_time as the first entry, the x, y, and z coordinates at the 2nd, 3rd, and 4th entry and the number of the return as the 5th entry of each line. the entries are separated by a komma.
Altering the header separator
$ las2txt -i lidar.las -o lidar.txt -parse xyzia -sep semicolon -header pound
converts LAS file to ASCII and places the x, y, and z coordinate at the 1st, 2nd, and 3rd entry, the intensity at the 4th and the scan angle as the 5th entry of each line. The entries are separated by a semicolon. at the beginning of the file we print the header information as a comment starting with a '#' symbol.
Altering the coordinate order
$ las2txt -i lidar.las -o lidar.txt -parse xyzcu -sep tab -header percent
converts LAS file to ASCII and places the x, y, and z coordinate at the 1st, 2nd, and 3rd entry, the classification at the 4th and the user data as the 5th entry of each line. the entries are separated by a semicolon. at the beginning of the file we print the header information as a comment starting with a '%' symbol.
