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 your EDM instrument and a reflector. The time the beam takes to come back is then calculated as distance. Today, such calculations can be achieved using sophisticated GPS systems.
The Global Positioning System runs on the network of satellites to precisely pinpoint the device's location on the planet at at any time. GPS uses the principle of trilateration, utilizing 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 even more satellites; there are a total of 24 Global Positioning System satellites currently used. First developed by the U.S. Department of Defense as a navigational assist in 1994, today it is used 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 notice the complete coordinates of spatial locations. Exact measurement of the positions is probably the fundamental components of land surveying. The advantage of is that it is much more accurate than hand-measuring these locations. There's some extent of error in all land surveying measurements, due to human errors, environmental characteristics like variations in magnetic fields, temperature, and gravity, and instrument errors. GPS permits much more precise measurements than previously open to land surveyors using measuring tape and an angle sight.
Another benefit of the usage of its use as a land surveyor is that the coordinates can be located precisely, while other ways of land surveying depend on measurements from other known locations, including the edge of the property line, the corner of a residence, or another landmark. Land Surveyor Manchester could change as time passes, such as if a house is torn down or another obstacle is built between your structure and the measured point; a good surveyor's stake may be removed before the land is re-surveyed. The coordinate of a given location on the planet, however, remains exactly the same. Therefore, using GPS as a land surveyor produces measurements which will be accurate regardless of what happens to the encompassing land.
Although Global Position System receivers enable very precise measurements, there is still a degree of error involved. A receiver on a tripod will record the location slightly differently 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 designed for non-surveying uses, may create a band of measurements clustered within just one centimeter of the actual location. Today's receivers are steadily gaining used, but might not be as accurate because the surveyor would like, especially in areas which 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.