Products 04/20/2011 High-Speed Scanning: Extended Range The HDS7 000 phase-based laser scanner can capture vertical surfaces over 100 meters away. It has an updated interface and improved accuracy over long distances. Leica Geosystems Inc.; 770-326-9500; www.leica-geosystems.us Far-Reaching Crane: Long Boom The Grove RT9150E Rough-Terrain Crane has a 197-ft main boom and a rated capacity of 150 tons. The crane's long boom allows it to reach heights that would otherwise require a jib, and it is able to work on jobsites at which space is limited. With attachments and inserts, the crane can attain a maximum tip height of 312 ft.
Arch dams, classically curved monoliths situated in narrow valleys, are not as common as other types of dams, such as embankment dams and gravity dams. ENR takes a look at some of the biggest arch dams in the world, both completed and under construction.