ASA's Earth Surface Mineral Dust Source Investigation (EMIT) collected this hyperspectral image of the Amazon River in the northern Brazilian state of Pará on June 30, 2024. The tan and yellow colors represent vegetated land, while the blue and turquoise hues signify water. Clouds are white. This image is part of a new dataset providing new information on global ecosystem biodiversity.
EMIT, installed on the International Space Station in 2022, was originally tasked with mapping minerals over Earth's desert regions to help determine the cooling and heating effects that dust can have on regional and global climate. Since early 2024 the instrument has been on an extended mission in which its data is being used in research on a diverse range of topics including agricultural practices, snow hydrology, wildflower blooming, phytoplankton and carbon dynamics in inland waters, ecosystem biodiversity, and functional traits of forests.
Imaging spectrometers like EMIT detect the light reflected from Earth and then separate visible and infrared light into hundreds of wavelength bands. Scientists use patterns of reflection and absorption at different wavelengths to determine the composition of whatever the instrument is observing.
EMIT is laying the groundwork for NASA's future Surface Biology and Geology-Visible Shortwave Infrared satellite mission. SBG-VSWIR will cover Earth's land and coasts more frequently than EMIT, with finer spatial resolution.
Source: https://www.jpl.nasa.gov/images/pia26417-nasas-emit-scans-the-amazon-river-in-northern-brazil/
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