Question

ONLY QUESTION THAT NEED ANSWERING IS QUESTION 14 (QUESTION 2 IN THE PAGES) THANK YOU SO MUCH FOR YOUR HELP! :)

Problem Set #2-worth 10pts The topographic map below is from the USGS O'Leary Peak, AZ 7.5" quadrangle map. The contour interval is 20 ft. Construct a topographic profile along the line X-Y using the space on the following page. 7300 7400 Medicine Valley North 7300 449 SCALE 1:24 000 0.5 KILOMETERS 1000 500 METERS 1000 0.5 MILES 1000 0 1000 2000 3000 5000 FEET CONTOUR INTERVAL 20 FEET NORTH AMERICAN VERTICAL DATUM OF 1988 Problem Set #2 continued 1. Construct a topographic profile below along the line X-Y on the map on the previous page. You may use the index contours for the profile using the gridlines given and use the regular contours to help define the shape of the profile, especially at the summit areas. Note that at this scale, it will be difficult to accurately draw all the details -the overall shape is what I'm mostly looking for. Label the elevation of each gridline, and answer the questions below 2. Given the vertical scale of 1 in400 ft and the horizon tal scale of 1n 0.25 miles (note that the map provided is not 1:24,000 as in the original printed map), calculate the vertical exaggeration of the topographic profile. Show your wor Vertical Exaggeration- 3. The two sets of concentric closed contours on the map and the topographic profile you've constructed represent what general types of topographic features? The two sets of concentric closed contours with hachure marks on the inside represent what types of topographic features. Given the concentric closed contours without and with hachures and their relationship to each other, what type of geologic features do you think are represented in the map and in your profile? 4. In what direction is the small intermittent stream flowing where it crosses the center of the profile line? In what direction does it flow to the east of the profile line 5. What is the average gradient of the slope along the line from point A to B? Show your work. QUESTION 14 What is the vertical exaggeration of the topographic profile that you constructed for Problem Set #2 Question 1? 2.2x 3.3x 22x 33x

Answer 1

The vertical scale is given as

1 inch = 400 feet, or 1 : 400

The horizontal scale is given as

1 inch = 0.25 miles

Since 1 mile = 5280 feet, so 0.25 miles = 1320 feet, thus the horizontal scale can be re-written as

1 inch = 1320 feet, or 1 : 1320

The vertical exaggeration is calculated as

(Vertical scale / Horizontal scale)

So the vertical exaggeration of the topographic profile is

( 1 / 400 ) / ( 1 / 1320 ) = 1320 / 400 = 3.3

Thus the correct option is 3.3x, i.e. the vertical scale is 3.3 times larger than the horizontal scale of the topographic profile.