Landsat’s Role in Managing Ecosystems and Biodiversity
Our world is made of complex networks of living things and physical elements that constantly interact and affect each other. Such networks are known as “ecosystems.” Healthy and economically important ecosystems such as temperate forests, wetlands, grasslands, coastal zones, coral reefs, and rainforests all play roles in human life. For example, farm and rangeland ecosystems must be healthy to produce the grains and livestock on which we depend as a nation. Marine ecosystems depend on the health of land ecosystems, because coastal areas provide habitat needed to support the productivity and diversity of aquatic organisms. Landsat has brought valuable capabilities to ecosystem studies. Landsat instruments measure reflected light in visible and infrared wavelengths. Because plants reflect little visible light and a lot of infrared light when they are healthy, the measurement of both types of light simultaneously gives scientists a way to assess plant health and density over a landscape. Measurements are detailed enough while still covering a wide area that ecologists can expand their interpretations of local events and processes, such as an insect infestation in a specific forest, to a regional scale. This helps them to gauge the health of larger ecosystems. Because Landsat data are accurately mapped to reference points on the ground and adjusted for topographic relief, they can be integrated with other geographic data sets and models to explore more complex studies of ecosystems and biodiversity across space and time.
Every summer in New Zealand, recreational swimming in Okawa Bay is often prohibited because of toxic algal blooms. According to a Jan. 20 article in the New Zealand Herald, Waikato University
Contributor: Gretchen Cook-Anderson Grainy photographs of America’s Old West recall a time when large bison herds migrated across wide prairie lands, 30 million strong, with the changing seasons determining their path
Contributor: Mike Bettwy NASA satellite data was used to help monitor the health of Florida’s coral reef as part of a field research effort completed this August and September. The project
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Contributor: Jeff Masek The United Nations Environmental Programme (UNEP) has undertaken an assessment of the recent dramatic decline in some unique Mesopotamian marshes, and has relied heavily on Landsat data for