3D laser scanners are big investments, and WestLAND Group, Inc., founded in 2000 in Rancho Cucamonga, California, spent years looking for the right instrument. The company had a definite need; the work they do for railroads often calls for clearance surveys around tunnels and bridges, and point clouds and cloud-based models are ideal for this.
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3D scan of the entrance to the tunnel.
The Leica MS50 MultiStation in front of the tunnel entrance.