How to draw a topographic map contour lines. Now that we have points to connect lets draw smooth contour lines for each interval. The contour lines then portray the 3 dimensional shape of the surface of the land. On topographic maps they are indicated by brown lines and come in three types. Draw vertical lines above your starting and ending points.
Display the images of topographic or contour maps. Show students map images and introduce the activity. Contour map characteristics contour interval. Often occur in intervals of five contour lines.
Contour lines contour lines or isohypses connect points of equal elevation. An important feature of topographic maps is the use of contour lines to note elevation. Draw a horizontal line on the graph paper that is the length of your profile line. For 125 000 scale maps the interval between contours is usually 5 metres although in mountainous regions it may be 10 metres.
And there we have it. Working downslope from the highest elevation thread contours through ticks of equal value. Essentially we are connecting the points with lines. A set of rules or guidelines are given to help when drawing contour lines.
Consider a receding water level. Contour map characteristics index contours are used to label the elevation of the their associated points. Essentially we are connecting the points with lines. 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.
Working downslope from the highest elevation thread contours through ticks of equal value. Because its impractical to mark the elevation of every contour line on the map the index contour lines are the only ones labeled. Then draw smooth lines and label them. To make topographic maps easier to read every fifth contour line is an index contour.
Learn how to draw contour lines by first plotting elevation points. Make sure students understand that contour maps though 2 dimensional use contour lines to show elevation above sea level. A set of rules or guidelines are. Finally draw your contour lines.
Move to the next highest elevation when the surface seems ambiguous.