![]() ![]() Moreover, topographical surveyors in Edmond know how to do it. They’re useful because they illustrate the shape of the land surface-its topography. Contour lines show elevation and the shape of the terrain. Contour LinesĬontour lines are lines drawn on a map connecting points of equal elevation, meaning if you physically followed a contour line, elevation would remain constant. If the numbers associated with specific contour lines are increasing, the elevation of the terrain is also increasing. Index contours are bold or thicker lines that appear at every fifth contour line. Contour IntervalĪ contour interval is a vertical distance or difference in elevation between contour lines. You find the contour interval for your map in its legend. At some point along that line, its exact elevation is listed. Index contour lines: Every fifth contour line is a thicker, “index” line. ![]() Studying a topo map of a familiar area is a great way to learn how to match terrain features with the contour lines on a map. There are three ways of the Indirect methodĪlso Read: What Is the Well Point System? | Types of Well Point System | Advantages & Disadvantages of Well Point System In this way, relative heights are determined by level machine keeping staff at different points. With less effort from an INDIRECT METHOD,Ĭontour lines can be drawn on the map. This method is faster and cheaper than the direct method. Thus marking the different points with a 1.40 mt reader on the ground and connecting them becomes a contour line with 100 mt R.L.Īlso Read: What is Tributary Area? | Tributary Area in Column | How to Calculate Tributary Areas 2. So that the staff reading of each point on the 100 mt contour line is 1.4 mt. We now have to draw a ground contour line of 100 mt. Suppose the benchmark is R.L 100 mt, and It comes with a reading of 1.40 mt. ![]() In this method, the level machine is fixed in the center, then the machine’s leveling is done than reading is done on the benchmark first. In this method, the points connecting the points of equal height are drawn using a dumpy level machine.
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