[Liblas-devel] Intensity Images with GDAL and liblas

[Doug_Newcomb at fws.gov]

I generally use las2txt to create the text files  ( 
x,y,z,intrensity,number of returns, return number) and then aggregate all 
of the text files to a single file and use r.in.xyz in grass.  With 
r.in.xyz, you can designate which colums are x, y, znd z.  For 
intensities, I use the x,y values and use the intensity value as the z 
value, preforming a mean statistic on the intensity values  in each cell . 
 I have done this with text files up to 140 GB in size.  Recently, I have 
been filtering by return number to get the mean intensities of the last 
returns to try to help determine moist soil/wetland footprints.

Email me directly and  I can send a couple of screenshots.


Doug

Doug Newcomb 
USFWS
Raleigh, NC
919-856-4520 ext. 14 doug_newcomb at fws.gov
---------------------------------------------------------------------------------------------------------
The opinions I express are my own and are not representative of the 
official policy of the U.S.Fish and Wildlife Service or Dept. of the 
Interior.   Life is too short for undocumented, proprietary data formats.



Peter Tittmann <pwtittmann at ucdavis.edu> 
Sent by: liblas-devel-bounces at lists.osgeo.org
04/22/2011 10:35 PM

To
Aaron Reyna <aaron.reyna at gmail.com>
cc
liblas-devel at lists.osgeo.org
Subject
Re: [Liblas-devel] Intensity Images with GDAL and liblas






If you are looking for gridded intensity rasters you could use grass. It 
would be similar to creating a DEM. Theres an example here 
http://www.locuscor.net/wordpress/ of piping the output of las2txt. You'll 
need to switch references around to refer grass to the intensity value.

Peter

-- 
Peter Tittmann
UC Davis
Geography Graduate Group

On Friday, April 22, 2011 at 4:35 PM, Aaron Reyna wrote:
anyone know how to kick out intensity images with libalas and GDAL. Not 
directly looking for code, but it's a problem I'm standing in front of 
right now.

Any help is much appreciated.

Aaron
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