Version 2 (modified by mark1, 9 years ago) (diff)

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LIDAR Classification

Purpose

Method

classify_las.out

This is a c++ utility written to do basic classification on LAS files. The current classification algorithms include:

  • Isolated points - identify points as noise (classification 7) if there is no other point within x metres of it.
  • Absolute elevation - identify points as noise (classification 7) if they are above or below a given elevation.

A fence can be used to only classify points within a rectangular boundary.

Usage

 -lasfilein <LASFILENAME>    The LAS file to be imported and classified
 -lasfileout <LASFILENAME>   The name of the output LAS file 

optional flags

 -isolated x                 Run the isolated points algorithm using a distance of x metres
 -above x                    Run the absolute elevation algorithm classifying points with elevation above x metres
 -below x                    Run the absolute elevation algorithm classifying points with elevation below x metres   

 -fence minx miny maxx maxy  Use a fence whose bounds are given by minx,miny maxx,maxy   

Currently only one method can be used per run of the software. This is due to be changed shortly.

Example - to classify isolated points

classify_las.out -lasfilein example.LAS -lasfileout classified.LAS -isolated 5