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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.
The elevation or differences in elevation on the surface is usually shown as contours. A 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 topo survey may have a contour interval of 2-foot to 5-foot typically.Again, these contours are a way to represent the relative elevations of the surface of the land.he topo survey is different in that the elevation of the surface of the land is surveyed and represented on the resulting map of the survey. The topo survey usually also includes any man-made underground features, like utility lines.