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In August 2000, Topcon acquired JPS Inc., of San Jose, California, a provider of precision GPS and GPS/GLONASS products. With the introduction of a series of positioning products, Topcon Laser Systems grew, and consolidated the survey instruments, GPS products and construction positioning products divisions in July 2001.
Products for Surveying from Sokkia are GNSS systems, robotic total stations, reflectorless total stations, automatic / digital levels, field / desktop software etc. Products for Construction from Sokkia are rotating lasers, line lasers, machine control receivers, levels, theodolites, total stations etc.
These dual-frequency GPS receivers typically cost US$10,000 or more, but can have positioning errors on the order of one centimetre or less when used in carrier phase differential GPS mode. Survey-grade GNSS receiver industry include a relatively small number of major players who specialize in the design of complex dual-frequency GNSS receivers ...
A surveyor uses a GNSS receiver with an RTK solution to accurately locate a parking stripe for a topographic survey. Real-time kinematic positioning (RTK) is the application of surveying to correct for common errors in current satellite navigation (GNSS) systems. [1]
Total stations are the primary survey instrument used in mining surveying. A total station is used to record the absolute location of the tunnel walls, ceilings (backs), and floors, as the drifts of an underground mine are driven. The recorded data are then downloaded into a CAD program and compared to the designed layout of the tunnel.
GPS surveying differs from other GPS uses in the equipment and methods used. Static GPS uses two receivers placed in position for a considerable length of time. The long span of time lets the receiver compare measurements as the satellites orbit. The changes as the satellites orbit also provide the measurement network with well conditioned ...
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