How to draw a topographic map contour lines. The contour lines then portray the 3 dimensional shape of the surface of the land. Working downslope from the highest elevation thread contours through ticks of equal value. And there we have it. Working downslope from the highest elevation thread contours through ticks of equal value.
A set of rules or guidelines are. On topographic maps they are indicated by brown lines and come in three types. An important feature of topographic maps is the use of contour lines to note elevation. Bolded to facilitate reading of the map.
A contour is a line drawn on a map that joins points of equal height above sea level. Now that we have points to connect lets draw smooth contour lines for each interval. Learn how to draw contour lines by first plotting elevation points. To make topographic maps easier to read every fifth contour line is an index contour.
Contour map characteristics index contours are used to label the elevation of the their associated points. Contour lines contour lines or isohypses connect points of equal elevation. Display the images of topographic or contour maps. Essentially we are connecting the points with lines.
Consider a receding water level. Often occur in intervals of five contour lines. A contour line connects points of similar elevation. A set of rules or guidelines are given to help when drawing contour lines.
Show students map images and introduce the activity. Make sure students understand that contour maps though 2 dimensional use contour lines to show elevation above sea level. Then draw smooth lines and label them. Label the y axis vertical lines with elevations making sure that your scale goes from highest to lowest on your cross section see step 3.
Draw a horizontal line on the graph paper that is the length of your profile line. Contour map characteristics contour interval. This video teaches how to draw contour lines when given a grid of benchmark points. Move to the next highest elevation when the surface seems ambiguous.
Because its impractical to mark the elevation of every contour line on the map the index contour lines are the only ones labeled.