[Therion] Turning LIDAR point clouds into cave maps

[Julian Todd]

If you can export your file as a las/laz file (or it also takes
PolyCam's zip file of a laz file),
then I have a place where you can preview it using the potree.org
software.   https://las.nix.how/

Try using the shortcode: c0987  to see a scan that was made underwater
using photogrammetry.

The potree software converts the pointcloud into streamed data, so it
doesn't matter how
massive your starting scan is as it only loads a limited amount.

This is used as the starting point for tunnelvr, should you choose to
use it for tracing

up your scan into a 3D map representation.

Julian.



On Wed, 29 Nov 2023 at 13:28, Bill Gee <bgee at campercaver.net> wrote:

> Hello everyone -
>
> This is probably more of a general practices question than something
> specific to Therion.  Among the group there is likely to be some
> experience with this.  I hope at minimum someone can guide me to a place
> for further learning.
>
> A few years ago Apple released a very high-end smartphone which has a
> LIDAR feature (iPhone 12 Pro).  There are a few more models now which
> have it.  I have heard of some people using this to create cave maps.
> There is much I do not understand.
>
> Has anyone in the group taken the point cloud from an Apple LIDAR scan
> and turned it into a Therion cave map?  If so, I am very interested in
> the details of the process.
>
> The biggest issue I see is this:  How does the iPhone know where it is?
> There is no GPS in a cave.  GPS is not accurate enough even if it did
> work.  Inertial navigation also has big problems dealing with a cave
> environment.
>
> There are many other issues, but I think that is the big one.
>
> Thanks!
>
> --
> ===============
> Bill Gee
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>
>
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