Contour intervals on a topographic map. A map is a representation of the earth or part of it. The change in elevation from one contour line to the next is always the same within the same map. The distinctive character istic of a topographic map is that the. These lines are called contour lines and they make a topographic map their unique subset of planimetric map.
When you follow a path on a topographic map that crosses these contour lines you will be either climbing or descending. The beauty of the contour line. A contour line also isoline isopleth or isarithm of a function of two variables is a curve along which the function has a constant value so that the curve joins points of equal value. If you have ever felt bumps on a map or globe you have used a.
At some point along that line its exact elevation is listed. Before the elevation of any point on the map can be determined the user must know the contour interval for the map he is using. A topographic map is a two dimensional representation of a three dimensional land surface. Contour lines can be drawn for any elevation but to simplify things only lines for certain elevations are drawn on a topographic map.
Topographic maps are differentiated from other maps in that they show both the horizontal and vertical positions of the terrain. Every fifth contour line is a thicker index line. A relief map is a specific type of topographic map that uses colors and shading to show heights and features on the map. A map is a representation of the earth or part of it.
The most notable aspect of a topographic map is all the squiggly brown lines.