NASA’s new CASALS instrument is a space‑based laser system that scans Earth’s forests and terrain one narrow line at a time, producing highly detailed three‑dimensional maps. Conventional laser altimeters collect data along discrete swaths, leaving wide gaps between lines that cover millions of acres of land that have never been directly measured from orbit.
CASALS is designed to bridge those gaps by blending data from adjacent lines with advanced algorithms, creating a seamless, continuous surface model. The resulting maps will have higher spatial resolution and fewer missing areas, allowing scientists to track changes in forest structure, topography, and land use with greater accuracy.
The enhanced coverage will benefit a range of applications, from monitoring deforestation and assessing carbon stocks to improving flood‑risk models and guiding land‑use planning. By filling in the missing data, CASALS will provide a more complete picture of Earth’s surface, supporting better decision‑making for environmental stewardship and climate science.
Why it matters: The instrument’s ability to produce continuous, high‑resolution 3D maps improves the precision of environmental monitoring and resource management.
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