Surveyors are responsible for taking measurements of land in order to establish boundaries for property and other uses. The information they gather is crucial for construction and engineering projects. To pinpoint the exact boundary lines of real estate and other properties, surveyors conduct research on land records, survey records, and land titles. They utilize tools such as GPS or tripod infrared reflectors, as well as their knowledge of geometry, physics, and engineering, to determine the precise location of roads and the necessary depths of building foundations. Additionally, surveyors establish land and water boundaries for deeds, leases, and other legal documents, and may also provide testimony in court regarding their survey work when required.