To calculate the lake’s change in area over time, you’ll compare imagery of the lake taken by Landsat satellites between 1984 and 2014. The Landsat satellite program has been in operation over 40 years, making its imagery vital for monitoring major planetary changes. You’ll classify the pixel values of the imagery into categories based on land cover. Then, you’ll display only land cover of Lake Poyang, isolating the lake from the rest of the image. Then, you’ll clean up your classified images with generalization analysis tools to remove small errors or minor water bodies around the lake. You’ll also smooth the lake’s boundaries. After preparing your images, you’ll calculate the area of the lake over the past 30 years and determine how much it has changed.