Engineering is the application of scientific and economic principles to design and build machines, structures, and other items, including bridges, roads, vehicles, and buildings. Civil engineering deals specifically with designing and constructing physical and natural built environments like roads, buildings, airports, tunnels, dams, and bridges. A survey is used to collect information about natural and man-made features of an area using various instruments, and has applications in areas like construction, geology, archaeology, and more. Modern surveying instruments have become more advanced with technologies like total stations, GPS, levels, theodolites, distance meters, and more that improve accuracy of data collection.