Exercise 7 Parts 1 and 2

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Feb 20, 2024

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Exercise 7 Problems—Part I—Google Earth™ Name: Brandon WhitakerRoss Answer the following questions after you have installed the free Google Earth software from https://earth.google.com and opened the program on your computer. 1. In the “Search” box, enter the latitude and longitude of Crater Lake in Oregon; remember, you don’t need to enter the symbols for degrees, minutes, or seconds, but you do need to leave a space between each value: 42°56′20″ North, 122°06′25″ West. a. What is the apparent altitude of your “eye” in this opening view? Opening view is around 9,464 feet b. Zoom out by clicking on the “−” symbol at the bottom of the zoom control until you can see the entire lake. What is the apparent altitude of the “eye” now? The eye view now is around 40,742 feet c. Move your cursor around the rim. What is the highest elevation you find around the rim of Crater Lake? The highest elevation is 8,042 feet 2. In the “Search” box, enter the address of your house or school. Zoom in as much as you can on your house or school building before image quality begins to break down. a. Location: Latitude: 35 º 04’22.94’’N– Longitude: 106 º 37’02.84’’W b. Elevation: 5,178 c. What time of day was this image taken? (circle) Morning / Midday / Afternoon d. How can you tell? I can tell that it is midday because the sun is up in the far west. e. What is the date of the imagery? The image was dated October of 2022 To answer problems 3 to 6, follow the link to the Hess Labs Media Website and select “Exercise 7 Part I Google Earth” to open a KMZ file in GE. The opening view is the same region north of Canyonlands National Park and the Green River in Utah shown in Figure 32-3 and Map T-20. 3. In the Places panel, double click on “Point 1” to fly to this location. What is the elevation of Point 1? The elevation at point 1 is 4,191 feet

4. A. Double click on Point 2 to change your vantage point. What is the elevation of Point 2? The elevation at point 2 is 4,504 feet b. What is the relief (the difference in elevation) between Point 1 and Point 2? The difference in elevation is 313 feet 5. Fly to Point 3. Click the “+” button on the Zoom control to move in closer to this sharp turn called “Bowknot Bend” along the Green River. Using the forward arrow on the Move control, fly over the landscape until you have a clear view of Point 3 along the river bottom. From this angle, it may appear that clouds are draped over the ridge between the tight loops in the river’s course. The historical imagery you see was taken in 2003 from a vantage point nearly directly overhead of this area and the clouds were not really this low to the ground, so why do the clouds appear this way in GE? The reason why the clouds appear this way in google earth is because the vertical aerial imagery has been stretched down over the digital elevation model. 6. Fly to Point 4 a short distance away. You are going to measure the gradient of this slope. Double click on Point 5 to move in closer and look directly down on this slope. Determine the gradient of the slope between Point 4 and Point 5. 6493-6388 ¿ 105 the distance in miles is 1.55 miles (Elevation changes) ÷ (Distance in miles) ¿ 67 The gradient of the slope between Point 4 and Point 5 is 67 feet/mile gradient.

Exercise 7 Problems—Part II—Internet Go to the National Map (https://viewer.nationalmap.gov/viewer/). Once the viewer has opened, in the “Find Address or Place” box, enter the latitude and longitude of the area north of Canyonlands National Park shown in Figure 32-3 and Map T-20: 38 w. Select “USGS Imagery Only” to see aerial imagery of this area. Zoom out until you have a good view of this half-circle- shaped hill encircled by a dry gorge. 1. Use the Spot Elevation function to determine the relief of this hill: The elevation at the top of the hill is 4,757 and the elevation in bottom of the dry gorge is 4,110 The relief is around 647 feet. (Elevation at top of hill) −(Elevation in bottom of dry gorge to north)= (Relef)feet 2. a. Was this aerial image taken in the morning or in the afternoon? Morning b. How can you tell? Because the shadows show the sun is low in the east.

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Exercise 7 Parts 1 and 2

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