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Contour lines normally connect areas with equal data values, so may generally be called isolines or isopleths-lines of the same value. Normally, the primary set of contour lines is displayed as a solid line, while the secondary contour is displayed as a &shed line. For example, a standard 850-hPa, 24-hour prognosis chart has height contours in solid lines, temperature contours in dashed lines, and wind speed and direction as plotted data.
Much like any other type of survey, a topographic survey, or topo survey for short, is done to locate natural and man-made features on a particular parcel of land. This is sometimes called planimetric features or things you can see from a plan view as if you were hovering over the site. contour line is a line that connects points of equal elevation. There is usually a contour interval set, say 1-foot for conventional survey. An aerial topographic survey may have a contour interval of 2-foot to 5-foot typically.