Cave Scanning

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landmeterbeuckx
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Re: Cave Scanning

Post by landmeterbeuckx »

santanafc wrote: Tue Apr 12, 2022 1:00 pm Hello everyone!

We are monitoring the geostructural features of the cave using laser data. We had the idea after mapping the caves using Laser SLAM technology. Due to the size of the caves, we are using the laser with SLAM technology (Reading 43,200 p/s, accuracy from 1 to 3 cm), not the topographical laser.

As a result, we are having problems with the density of points to monitor the structures (cracks in the wall smaller than 1 cm) making it impossible to read the distances. Could you guide us on a method/equipment that could be used in small Caves (less than 10 m of horizontal projection and with a low ceiling), operating at a density of points smaller than 1 cm?
How high are the caves? If higher then 1.5m you could use tls with many stations. Reference through spheres or targets.
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Re: Cave Scanning

Post by kpob46 »

I’ve scanned many caves for geological mapping. My go to is our VZ400i with the camera attachment and external flash. You have to tighten up your scan position spacing, but it has worked quite well. As Lieven said, certainly use registration targets for a 7 mile distance.

If you were to go the SLAM route, Hovermap or Geoslam both have camera options. Get creative and come up with some sort of LED lighting rig. Split up the survey into at least 7 different surveys. For post processing, just filter out the points by colour and get rid of all the dark points.
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Re: Cave Scanning

Post by santanafc »

Great!

Some caves have a height of less than 1.5 m.

Perhaps a basis for replacing the tripod is a solution. Then we would use the VZ400 I, for example.
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Re: Cave Scanning

Post by smacl »

santanafc wrote: Tue Apr 12, 2022 6:46 pm Great!

Some caves have a height of less than 1.5 m.

Perhaps a basis for replacing the tripod is a solution. Then we would use the VZ400 I, for example.
You can certainly get lower tripods but if the scanner is too close to the ground excessive scan shadows could become a real issue. You'd need to plan your sight lines very carefully.
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