Self test remote sensing

11 important questions on Self test remote sensing

In what part of the EM-spectrumm do we use the therm spectral signature?

In the visible, near infrared (NIR) and middle infrared (MIR) part of the EM spectrum

What ways of deriving the reflectance from measurement can you describe?

- Measure both incoming and reflected radiance and then take the ratio
- Measure the reflected radiance relative to some known reference
- Apply an atmospheric correction model

What are the main soil properties determining the spectral reflectance?

- Soil moisture
- Mineral composition
- Humus content
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What are the main leaf properties determining the spectral reflectance?

- Chlorophyll content
- Water content
- air-cell wall transitions

What are the main canopy protperties determining the spectral reflectancE?

- Leaf area index (LAI)
- Cover
- Leaf angle distribution

Explain why the spectral reflectance of bare soil and the one of green vegetation is so different?

Chlorophyll causes the low vegetation reflectance in the VIS, not for soils. Leaf structure (air-cell wall transitions) causes the high vegetation reflectance in the NIR, not for soil

Why does healthy vegetation look green for the human eye?

The reflectance in the green is higher than in the blue en red

What plant or canopy properties can we use best for discriminating plant species?

Chlorophyll and leaf structure

What are the major factors that cause the spectral reflectance of a certain object to show variation?

- Time of the year
- Geographic location
- Cultivation practices
- Influence of stress
- Solar zenith angle
- Wind

What is the use of looking at the temporal signature of crops?

- More chance to discriminate crops
- Monitoring the development of crops

Why do you measure ground reflectance?

Measurments of reflectance on the ground give a direct insight in the effects of surface charasteristics

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