[Tagging] Mapping cave tunnels passable by human

[SomeoneElse]

On 14/08/2014 12:35, John Packer wrote:
> One question.
> How would people map a cave?
>

(answering in case it wasn't a completely rhetorical question):

One option is the same way that people mapped before GPSs arrived - 
accurately measure a baseline and triangulate from it.  Obviously it's 
substantially harder to do in a confined space with low light than 
elsewhere.

These days you might also be able to make some use of the accelerometer 
in some mobile phones.  See also here: 
http://wiki.openstreetmap.org/wiki/Indoor_mapping .

Cheers,

Andy