Remote Sensing Technologies
Technologies including satellites, drones, and LiDAR that collect data about Earth's surface from a distance without physical contact.
Formula
NDVI = (NIR − Red) / (NIR + Red)
Real World
NASA's Landsat satellites have tracked Amazon deforestation since 1972; Brazil's PRODES system uses this imagery to publish annual deforestation rates, directly informing government enforcement operations.
Exam Focus
When discussing remote sensing, specify spatial resolution and revisit frequency — these determine suitability for the scale and speed of the ecological change being monitored.
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