How to draw a topographic map contour lines. For 125 000 scale maps the interval between contours is usually 5 metres although in mountainous regions it may be 10 metres. Essentially we are connecting the points with lines. This video teaches how to draw contour lines when given a grid of benchmark points. Bolded to facilitate reading of the map.
Learn how to draw contour lines by first plotting elevation points. Consider a receding water level. Essentially we are connecting the points with lines. Draw a horizontal line on the graph paper that is the length of your profile line.
Make sure students understand that contour maps though 2 dimensional use contour lines to show elevation above sea level. Finally draw your contour lines. Contour map characteristics contour interval. Often occur in intervals of five contour lines.
And there we have it. On topographic maps they are indicated by brown lines and come in three types. Working downslope from the highest elevation thread contours through ticks of equal value. Draw vertical lines above your starting and ending points.
A contour is a line drawn on a map that joins points of equal height above sea level. A set of rules or guidelines are given to help when drawing contour lines. Then draw smooth lines and label them. To make topographic maps easier to read every fifth contour line is an index contour.
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. A contour line connects points of similar elevation. Move to the next highest elevation when the surface seems ambiguous.
Show students map images and introduce the activity. Working downslope from the highest elevation thread contours through ticks of equal value. Display the images of topographic or contour maps. 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.
An important feature of topographic maps is the use of contour lines to note elevation.