Examples of what information is collected in the survey include: Elevation and contours: by measuring the land's elevation points, land surveyors create contour lines on a map, indicating the terrain's shape and slope. Natural features, such as hills, lakes, and streams, as well as vegetation types, forest densities, and significant singular entities like large trees. Man-made features, such as buildings, and fences. Property boundary lines and markers An underground utilities trace (locating water lines, gas lines, electrical cables, and sewage systems) alongside mapping surface utilities to supplement the information gathered. Surface water drainage patterns and features Topographic relief and terrain analysis, including slopes and depressions.