[Liblas-devel] Liblas-devel Digest, Vol 79, Issue 1

[Howard Butler]

> On Nov 9, 2016, at 2:20 PM, Martin Isenburg <martin.isenburg at gmail.com> wrote:
> 
> Hi,
> 
> I believe that Alex talks about the HAG stored as an additional point atttribute to an "Extra Bytes" field via the '-store_as_extra_bytes' switch.
> 
> http://lastools.org/download/lasheight_README.txt
> 
> There was a discussion on this in the LAStools user forum whether cm resolution with a scale factor of 0.01 and a 16 bits signed integer storage are enough for most trees.
> 
> http://groups.google.com/forum/#!searchin/lastools/lasheight$20store_as_extra_bytes
> 
> "Extra Bytes" fields are described in the LAS 1.4 specification and are therefore also more and more readable in other software.

All of this is accurate information.

Additionally, libLAS does not support LAS 1.4 or support writing LAS 1.4 extra bytes descriptor VLRs. You'll need to use LAStools or PDAL or LASpy to achieve this task if open source is a priority for you.

Howard