[Therion] Turning LIDAR point clouds into cave maps

[Balambér Hakapesz]

On Wed, Nov 29, 2023 at 2:28 PM 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 model must be converted into a raster image, it can be processed.

>
> The biggest issue I see is this:  How does the iPhone know where it is?

The iPhone doesn't know, it doesn't use GPS for lidar.
The model must be adjusted for surveying.

>
> 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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> Therion at speleo.sk
> https://mailman.speleo.sk/listinfo/therion


Balázs Holl
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