Landsat’s Critical 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.
How Scientists Used Acoustic Soundscapes and Satellites to Assess the Health of the Amazon Rainforest
Scientists from NASA’s Goddard Space Flight Center and the University of Maryland, College Park, investigated how the acoustics of a forest can be a cost-effective indicator of its health—and Landsat allowed them to see back in time.
Landsat has shown that wildfires and climbing temperatures have caused a 6.7 percent decline in California tree cover since 1985.
The Jane Goodall Institute (JGI) uses satellite observations, including data from the NASA and USGS Landsat satellite series, in their efforts to work in partnership with local residents to understand and protect chimpanzee habitats.
Landsat allows herders to monitor vast expanses of desert in a way traditional field monitoring can’t support.
An analysis of over a million Landsat images has revealed that 4,000 square kilometres of tidal wetlands have been lost globally over twenty years.