Active vs passive remote sensing?
likely emr
  • πŸ‘‚ Passive β€” sensor only receives natural energy
    • Source: solar reflection or target’s thermal emission
    • Examples: Landsat, MODIS, SPOT, IKONOS
    • Limit: needs the Sun (or warm objects for thermal)
  • πŸ“’ Active β€” sensor emits its own pulse and measures the return
    • Works day or night, often through clouds
    • Examples: Radar, LiDAR, scatterometers

Mnemonic: passive listens; active shouts and listens.

πŸ’‘

Passive = listens. Active = shouts and listens. Active works at night (radar/LiDAR don't need the sun).

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