Re: Pls help: extract LIDAR data from .all files

gimps.sa wrote:
Hi John,

Following replies from other members of the forum, the *.all may refer
to the fact that "all" the LiDAR points are contained in the file (you
LiDAR points are unfiltered). If your vendor has not filtered the
points then you will have a file containing all returns and not
'ground' or 'canopy' returns. We recently received a LiDAR data set
with a *.xyz filename that opens in any text editor. It is possible to
open and view the data in any standard GIS package. Try DIVA GIS, (open
source). You may need to add column names X, Y, Z, Intensity, depending
on the format and the size of your data set. But I am pretty sure *.all
simply means that points are unfiltered.

If you are working on a Linux platform you can use the 'more' or 'less'
applications at the command line to get a better idea of the format.

If you are stuck with Windows then I strongly
recommend you install Perl. I routinely processed
LIDAR data under Windows using Perl. The cloud of
points can easily be several million, and this is
presented in a really big text file. Perl handles
such huge files easily, and can be used to add
column headers, convert Tabs to commas and other
useful stuff you need to do to import your data
into GIS packages.

--
Regards,
Martin Leese
E-mail: please@xxxxxxxxxxxxxxxxxxxxxxxxxx
Web: http://members.tripod.com/martin_leese/
.

Relevant Pages

  • Re: Pls help: extract LIDAR data from .all files
    ... with a *.xyz filename that opens in any text editor. ... open and view the data in any standard GIS package. ... LIDAR data under Windows using Perl. ...
    (sci.image.processing)
  • Re: Pls help: extract LIDAR data from .all files
    ... LiDAR points are unfiltered). ... with a *.xyz filename that opens in any text editor. ... applications at the command line to get a better idea of the format. ... I got a CD with LiDAR data, but all files have an extension .all. ...
    (sci.image.processing)