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Unread 19 June 17, 21:43   #68
Emery
 
Join Date: Apr 2008
Location: Fiat Farm, in the wettest corner of Oregon
Age: 55
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Quote:
Originally Posted by Wee Scot View Post
OK, I don't have any experience using "command line" instructions, so I just read all the READMEs in the LAStools bin folder, and--unless you want to walk me step-by-step through how to bring up and use the forbiddingly black Command Prompt box--it looks like the tool I want to use is:

las2txt: Converts from binary LAS/LAZ 1.0 - 1.4 to an ASCII text format

But, if so, which of these usage examples do I want to follow?

1) >> las2txt -i lidar.laz -o lidar.txt -parse xyzEit -extra 0.1

converts LAZ 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
extra string "0.1" as the 4th entry and the intensity and time
of each point as the 5th and 6th entry.

2) >> las2txt -i lidar.laz -o lidar.txt -parse txyzr -sep comma

converts LAZ 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 comma.

3) >> las2txt -i lidar.laz -o lidar.txt -parse xyzRGB

converts LAZ file to ASCII and places the x, y, and z coordinates
at the 1st, 2nd, and 3rd entry and the r, g, and b value of the
RGB color as the 4th, 5th, and 6th entry of each line. the entries
are separated by a space. note that lidar.las should be format 1.2
or higher (because 1.0 and 1.1 do not support RGB colors).
Process of elimination...
Do you need gps_time for the import? No.
Does your las/laz file have color information? No.
That leaves one choice from your examples... but if you look more closely, you'll notice that what the examples are really showing is that the -parse arguments can be arranged in various ways. So maybe xyzit would be x,y,z followed by intensity and time. Naturally something I've not noticed before is that you MIGHT be able to rearrange the columns to be xzyi to arrive at the desired format for BTB Pro without taking an intermediate step through a spreadsheet or editor.
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