Passive and active systems
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