How Do You Read The Highest Contour Lines On A Topographic Map?
Topographic maps show the elevation of the terrain using contour lines. All the points on a contour line have the same elevation. Three types of contour lines are found on a topographic map. The index contour lines are dark brown contour lines with their elevation written on them. Between index contour lines are light brown lines drawn at regular intervals. Supplementary contour lines are occasionally used and are used to denote changes in elevation between intermediate contour lines. Supplementary contour lines are drawn as dashed brown lines. These contour lines allow the elevation of any point on a topographic map to be estimated. Determine the contour interval of the map. This is often located in the center of the bottom margin on the map. If the contour interval is not listed, find two separate contour lines on the map. Count the number of contour lines from one index line to the next. Divide the change in elevation between the two index contour lines by the number of contour line
