Remote Sensing in Geophysics
The acquisition of geophysical information about Earth's surface and atmosphere from a distance using satellite or airborne sensors.
Governing formula
NDVI = (NIR - Red) / (NIR + Red)
SI unit
Multi-Spectral Satellite Imagery
In depth
Employs passive sensors (measuring reflected sunlight and thermal IR) and active sensors (LiDAR and Synthetic Aperture Radar). Measures ocean sea surface temperature, ice sheet deformation, vegetation health (NDVI), and crustal deformation.
Examples in the real world
NASA Sentinel and Landsat satellites monitoring global rainforest deforestation and polar sea ice melt.