Changes between Version 2 and Version 3 of Processing/LidarNoisyPoints

Timestamp:

Feb 22, 2012, 9:39:10 AM (13 years ago)

Author:

mark1

Comment:

--

Processing/LidarNoisyPoints

@@ -15 +15 @@
 When a point has been identified as being 'noise' it is given a classification value of '7'. All other points will probably have classification of '0' (unclassified) or '1' (default). The classification values used follow the ASPRS standard LiDAR point classes.
 
-It is advised that these points be removed before using the data, unless they are of specific use to your studies. ARSF-DAN included a utility for removing these points from the ASCII files called 'pt_cloud_filter'. To remove them from LAS files it is suggested to download the LASTools package, specifically the las2las tool.
+It is advised that these points be removed before using the data, unless they are of specific use to your studies.  
 
 === Removing noisy points from ASCII files ===
 
+ARSF-DAN include a utility for removing these points from the ASCII files called 'pt_cloud_filter', which has both linux and Windows versions.
+
+To use, open the command line interface (in Windows: click start → click run → type ‘cmd’). Then type:
+
+{{{
+pt_cloud_filter [input_ascii_file] [classification number(s) to be removed] > [output_filename] 
+}}}
+
+For example:
+{{{
+pt_cloud_filter.exe point_cloud.txt 7 > filtered_point_cloud.txt
+}}}
+
+will create a file called filtered_point_cloud.txt from the points in point_cloud.txt excluding those with classification 7.
+
 
 === Removing noisy points from LAS files ===
+
+To remove them from LAS files it is suggested to download the LASTools package, specifically the las2las tool.