Lake Poyang, China's largest freshwater lake, has always had significant seasonal fluctuations in water level. Fed both by rains and the Yangtze River, Lake Poyang has lately experienced even more extreme fluctuations due to several years of drought and the construction of the Three Gorges Dam. Dry season water levels are alarmingly low, and even rainy season water levels have fallen. The changes have impacted the local economy and altered the land cover of the area. But if locals want to do something about their lake's disappearance, they'll need to back their live observations with scientific fact.
In these lessons, you'll assume the role of a geospatial scientist tasked with calculating the change in area of the lake between 1984 and 2014. Using Landsat imagery, you'll classify land cover in three images of the lake taken at various times over the past 30 years in order to show only the surface area of the lake. You'll then determine the change in lake area over time.