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[[image]] Student Worksheet 4.3 Two pictures can be combined to form a stereo image of an area if they overlap each other by at least 60%. [[image]] Here is an example of a stereo pair taken during STS-76: [[image]] [[image]] Using the information from student worksheet 4.1: Problem: 1. For the 180 mm lens, calculate 40% of the length of the footprint. ________ This will give you the distance from the beginning of image1 to the point that should be the beginning of image 2, 2. Now calculate the time it takes to go this distance. This will tell you how much time needs to pass between the two images in order to plan a stereo pair. 3. Now do the same thing for the 50 mm lens and the 85 mm lens. 09/19/96 Page 4.15