Passive and active systems

Close Window

| Passive (optical or thermal) Imaging Systems Relies on reflected sunlight or emitted thermal energy Unable to use through clouds, smoke or at night Vegetation response controlled by pigments, canopy structure & biomass |
| Active (microwave or radar) Imaging Systems Relies on a transmitter/sensor configuration Able to see through, clouds, smoke and at night Vegetation response controlled by water content, canopy structure & biomass |

##