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Thought Lanes * Home * About Log in Write Now Log in Subscribe * Home * About LAND SURVEYING AND GPS * Egan Urquhart 6 Feb 2024 · 2 min read Share: Land surveyors once used tape measures and transits to measure distances and positions. Since the 1980s, electronic distance measurement, or EDM, devices have allowed for much more efficient and accurate measurements. These use a wave of energy that is shot between the EDM instrument and a reflector. The time the beam takes to return is then calculated as distance. Today, such calculations can be carried out using sophisticated GPS systems. The Global Positioning System runs on the network of satellites to precisely pinpoint the device's location on Earth at at any time. GPS uses the principle of trilateration, using the location of several satellites to pinpoint an exact location. A receiver can determine the latitude, longitude, and elevation of a point using four or more satellites; there are a total of 24 Global Positioning System satellites currently used. First created by the U.S. Department of Defense as a navigational assist in 1994, today it is found in many devices, tracking everything from cell phones and delivery vehicles to the movement of the tectonic plates of Earth's crust. Land surveyors use Global Position Systems to note the precise coordinates of spatial locations. Exact measurement of these positions is among the fundamental elements of land surveying. The advantage of is that it is much more accurate than hand-measuring these locations. There's some degree of error in every land surveying measurements, due to human errors, environmental characteristics like variations in magnetic fields, temperature, and gravity, and instrument errors. GPS allows for much more precise measurements than previously available to land surveyors using measuring tape and an angle sight. Another benefit of the use of its use as a land surveyor is that the coordinates can be located precisely, while other methods of land surveying rely on measurements from other known locations, like the edge of the house line, the corner of a residence, or another landmark. These locations could change over time, such as in case a house is torn down or another obstacle is made between your structure and the measured point; even a surveyor's stake may be removed before the land is re-surveyed. The coordinate of confirmed location on the planet, however, remains exactly the same. Therefore, using GPS as a land surveyor produces measurements that will be accurate no matter what happens to the encompassing land. Although Learn more enable very precise measurements, there's still a degree of error involved. A receiver on a tripod will record the location slightly differently each and every time; when many measurements are taken, these data points will form a cluster round the actual location. Better-quality receivers, of course, reduce this level of error. Survey-grade receivers, rather than those meant for non-surveying uses, may produce a band of measurements clustered within just one centimeter of the specific location. Laser Scanning St George are steadily gaining in use, but might not be as accurate as the surveyor would like, especially in areas that are heavily wooded or which have other large obstructions. However, the technology is rapidly advancing and gaining a foothold in the available equipment for land surveyors. Since 1994, the accuracy available when using GPS units has improved steadily. Share: © 2024 Thought Lanes. All rights reserved. Design with by @GodoFredoNinja * Sign up No results found ↑ ↓ Navigate up/down Enter Go to article Esc Close search