Importing LAS to 12d - No Files Read

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Ashley Flower
Posts: 4
Joined: Tue Jun 11, 2013 10:42 am

Importing LAS to 12d - No Files Read

Post by Ashley Flower »

Hi,

I have been using the new Geoscience website (http://elevation.fsdf.org.au/) to get free lidar tiles.

However, I am getting point cloud .las files which I haven't used before.

When I try to import them under DATAINPUT>POINT CLOUD>LAS>Import LAS I get "finished reading data - no files read"

And I get no data come in. I have opened the LAS in textpad and its all encoded, but the fact that it is 40mB clearly tells me there is plenty of data to read.

Any thoughts?

Thanks,

Ashley Flower
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Ashley Flower
Senior Civil Designer

ashley.flower@
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Alexander Cook
Posts: 445
Joined: Thu Feb 01, 2018 10:22 am
Location: Toowoomba, Qld

Post by Alexander Cook »

Hey Ashley,

Not sure if you sorted this by now, but when downloading from Geoscience, the point cloud format is .laz which is a compressed format. You need to convert it to las to enable it to be read into 12d.

There are download tools available to do this for free, such as laszip (https://www.laszip.org/).

Good luck
Trent Lester
Posts: 170
Joined: Tue Nov 08, 2005 10:22 am

Post by Trent Lester »

Alexander,

Are you able to provide any assistance with the LASZIP program?

I am trying to Decompress a .laz file as mentioned above.

I think I have everything entered correctly however I don't get any resulting file.
Thanks,

Trent.
Matthew Monk
Posts: 3175
Joined: Fri Oct 21, 2005 2:46 pm

Post by Matthew Monk »

Did you download the Windows command-line only binary? https://laszip.org/#binaries
  1. Download that somewhere (same folder as your .laz files will be easiest).
  2. Open a command prompt (search the Start menu for cmd.exe) and browse to that directory.
    • In Windows Explorer, you can typically hold Shift and then right-click on a folder, which brings up a menu. One of these items can be "Open command window here", which will open a command window already at that location
    • Otherwise, type in:

      Code: Select all

      cd C:\Some\path\to\folder
      to change directory from the command prompt.
  3. Then you should just be able to run this command:

    Code: Select all

    laszip.exe -i my_zipped_file.laz -o my_unzipped_file.las
Alan Gray
Site Admin
Posts: 1154
Joined: Fri Sep 30, 2005 4:25 pm

Post by Alan Gray »

We have scheduled support for LAZ in an update.
Lee Gregory
12d Support
Posts: 2016
Joined: Thu Sep 29, 2005 6:06 pm

Post by Lee Gregory »

Please Note:
A LAZ is NOT simply a zipped LAS file.
Paul Mashford
Posts: 432
Joined: Tue Oct 11, 2005 11:08 am

Post by Paul Mashford »

We've been using lastools to convert LAS=>LAZ. We are wondering how the LAZ support is progressing ?
Also would like to request an option to import LAZ=>12d tin.
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