WEBVTT

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- Let's check out this video.

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- Hi, I'm Malcolm Williamson,

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I'm a Senior Research Scientist

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at the Center for Advanced
Spatial Technologies,

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better known as CAST, here at
the University of Arkansas.

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We have these systems
that are known as Lidar,

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that's Light Distance and Ranging,

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that uses a laser beam to
measure distances and angles

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and records those as measurements

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that can then become a 3D model.

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The machine behind me
here can actually record

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up to one million measurements per second,

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and it rotates around and
looks in every direction,

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and it's really easy to scan a cave

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very accurately with this.

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And so, our job is to go
in and document everything

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that's been added by
people into that cave,

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so the walkways and the elevator

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and the railings and lights
and things like that,

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because they hope to be doing
some improvements to the cave

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to make it more friendly to visitors.

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So we will take literally
hundreds of these

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at Blanchard Springs,
from different locations,

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because you can't see
everywhere from one location

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and you can't see behind
the stalactite over here

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and around rock over here,

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so we have to move the scanner around,

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and then our software will automatically

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stitch these together to
become a very very large file

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and a big model of the cave.

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So today this instrument
that we've got right here

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is about the most accurate
way that we can map a cave.

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Back to you, Amchat.