Atmospheric remote sensing toolkit

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# 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