Not only does EDM result in lower labor costs for the surveying company, it spares drivers stuck in a traffic holdup a major inconvenience. Previously, extra personnel were needed to stop traffic in all directions while the surveyors manually measured the area and recorded the results. This tool has been invaluable when surveying busy streets or other high-traffic areas. When EDM tools were first put into use, they required one surveyor to operate the instrument and another to stand at the target point with a prism to reflect the light back. It saves time because results do not have to be recorded at the scene.Īn EDM pinpoints distance much more accurately and is, therefore, more useful to engineers tasked with the construction of buildings or roads.It doesn’t require a second person to be on the receiving end of the signal, thereby cutting labor needs in half.It is highly accurate - down to ¼ inch.This method of measurement is especially useful for several reasons: When the electronic distance measurer came into wide use in the latter half of the 20 th century, it simplified the process dramatically. The theodolite, which measures horizontal and vertical angles, has been used as a surveying tool since the 16 th century. These steel tape measures had to be rolled and stored in a specific way so that they could retain their precision. Steel was the preferred material because unlike rope or cloth, it could not stretch and thereby lose accuracy, and unlike chain, it was not heavy and cumbersome. Steel tape measures were still being used as recently as 30 years ago. They used compasses to measure horizontal angles. Over the years, surveying methods moved from using feet to lengths of chain that had been premeasured, which surveyors would lay out straight and move end-over-end the way you would a measuring tape (if you had one). says that Greeks used surveying methods to build the pyramids, and the Romans used them to mark the boundaries of their empire. As anyone can imagine, this was rather imprecise, since feet come in varying sizes. Surveyors once did their jobs using the unit of measurement made common by the Greeks and Romans - the foot. Land surveying has been around for thousands of years - as long as land has been bought, sold, claimed or otherwise fought over. Survey tools have grown exponentially in sophistication in the last 20 years.
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