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</html><thumbnail_url>https://www.aptella.com/wp-content/uploads/2019/08/topcon-gls-2000-scanning-in-tunnels-youtube-thumbnail.jpg</thumbnail_url><thumbnail_width>640</thumbnail_width><thumbnail_height>480</thumbnail_height><description>Deformation monitoring of tunnel walls is an important safety procedure to prevent collapse during construction and while in operation. The GLS-2000 captures 3D data of tunnel surfaces quickly and efficiently. Even with the most complex surfaces, such as those along curves or at junction points, profiles can be modeled without difficulty.</description></oembed>
