Polarimetry

Measuring how the orientation (polarization) of light or radar waves changes on reflection. For aerosols (PACE HARP2) it constrains particle size and shape; for radar it reveals surface structure.

Why it matters

Polarization carries information intensity alone can’t — distinguishing spherical from non-spherical aerosols, or surface scattering from volume scattering in radar.

In plain terms

Polarized sunglasses cut glare by filtering wave orientation. Polarimetry reads that orientation on purpose, to learn what the surface or particles are made of.