Every point on a given contour line is of the exact same elevation contour lines connect points of equal elevation.Ģ. What is important is the relationship between the map distance and the true ground distance.ġ. The unit here is unimportant - it could be meters, feet, or inches. Thus, 1:24,000 means that a distance of 1 unit on the map represents 24,000 such units on the ground. ![]() The numerator, usually 1, represents map distance, and the denominator, a large number, represents ground distance. This is generally expressed as a ratio or a fraction, such as 1:24,000 or 1/24,000. The map scale expresses the relationship between the distance on the map and the true distance on the Earth's surface. Usually, every fifth contour line is printed heavier than the others and bears the elevation above sea level (an “index contour line”). A map’s contour interval is the difference in elevation between adjacent contour lines and must be consistent for a given map, though they may change from map to map. Relief is shown on a contour map by contour lines.Ī contour line is an imaginary line on the Earth’s surface connecting points of the same elevation. When relief is high, the area is steep, as in rugged mountainous terrain. Where the relief is low, the area appears to be relatively flat, as in river valleys or broad, flat uplands. Relief is the difference in elevation between any two points. cultural features man-made features like bridges, canals, buildings, and roads water features, including lakes, ponds, and streamsģ. relief, which includes hills, valleys, mountains, etc.Ģ. The features shown on topographic maps may be divided into three groups:ġ. Draw a profile between points X and Y and explain your procedure.Ī topographic map is a two-dimensional representation of part of the Earth’s three-dimensional surface, drawn to scale. How to draw a profile between two points on a topographic map.Ħ. Show all your work and include proper units in your answer. Explain how to find the gradient between points X and Y. How to find the gradient between two points on a topographic map.ĥ. Explain how you can determine the highest possible elevation for Rock Mountain. How to find the highest point on a topographic map.Ĥ. ![]() Label the lowest elevation on this map and explain how you know it is the lowest point. How to find the lowest point on a topographic map.ģ. Label the direction in which this stream flows with an arrow.Įxplain how you know the stream flows in that direction.īe careful the image in the video is different. How to find which way a stream flows on a topographic map.Ģ. Label the steepest and flattest slopes and explain how you can tell which area is the steepest. How to find the steepest slope on a topographic map.ġ. Watch these videos and answer the questions that go along with the images.īe sure to tape the images in your journal. Contour lines in a river valley or stream are often V-shaped, with the point of the V pointing uphill. ![]()
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