The tops of hills and valleys are usually rounded and not flat 112 Topographic Maps Part 2 Lab 11 Transfer the marked elevations to the graph. Lay the paper strip along the bottom of a graph. Where contour lines cross the profile line, draw a small line on the strip of scrap paper and label the elevation (Streams and other features can also be noted on the paper). Mark the end points of the profile (A and B). Place a strip of scrap paper along the line of the profile. The steps below explain how to construct a topographic profile along line AB Step 1. The profile view reveals surface features such as hills and valleys. ![]() What are possible elevations for: Z w W 200ĭirections on How to Construct a Topographic Profile a A topographic profile is a cross-section (side view) constructed along a chosen line on a topographic map. Label the contour lines, CL 50 feet Topographic Maps Part 2 lub 11 Label the elevations on your contour lines. Remember to make you contour lines "V' uphill when crossing the stream) 10. Write an Lat the lowest location on the map, 600 6 500 381. Write an H at the highest location on the map. What is a possible elevation for A? feet What is the possible elevation for B? feet Og 8 18 Topographic Maps Part 2 Lab 11 What is a possible elevation for C? feet BM 410 7. What is a possible elevation for A? feet 6. What is a possible elevation for X? feet 5. What is the elevation of the third index contour in the SE corner of the map? feet D. What is the difference in elevation between the labeled index contours (the heavier lines)? feet 4,000 3.800 B. Label the contour lines using a contour Interval of 50 feet 425 What is a possible elevation for A? feet N 11 Topographic Maps Part 2 107 A What direction is the stream flowing? BM B. Canyon River Trat 1100 Forest Tre- 1300 3. CWriteL on the lowest elevation on the map. Write Hon the highest elevation on the map. Which trail has a steeper slope? Canyon Trail Forest Trail B. In what type of topographic feature has Frog Pond formed? 2. What is the elevation of contour linex? Frog Pond C. A What is the contour interval on this map? feet B. ![]() ![]() Instead, these lines are continuous, although they can continue off the edge of the map.Name 1. In addition to obeying the set contour interval for a map, contour lines should never branch (split) or simply end inside of the mapped region. Benchmark locations will normally be found in the area between contour lines. For example, a benchmark of 236ft will be found somewhere between the 230ft and 240ft contour line (if the contour interval is 10ft), or between the 235ft and 240ft contour line (if the contour interval is 5ft). These benchmarks are rarely located on a contour line and instead are usually identified by a black “x” or identified with the letters “BM” and with the elevations included in black numbers (as opposed to the brown numbers on index contours). These surveyed points are exact elevations above sea level and are commonly used to mark the elevations of mountains, hilltops, road intersections, and airport runways. In addition to contour lines, topographic maps will also have benchmarks (actual surveyed points) in various locations on your map. ![]() Remember to use the contour lines to determine the elevations, and the bar scale on your map to measure the distance.
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