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Polarization in Electromagnetic Waves

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Questions and Answers

What is the primary advantage of using longer wavelengths in remote sensing radars?

Reduced beam mode variability

Enhanced polarisation effects

Improved resolution in cloud-covered areas

Increased capability to penetrate through precipitation or into a surface layer (correct)

Which radar frequency band is commonly used for terrain surveys and military reconnaissance?

C-band

P-band

L-band

X-band (correct)

At what wavelength range are radars not significantly affected by cloud cover?

Greater than 2 cm (correct)

Less than 2 cm

Between 2 cm to 4 cm

Between 4 cm to 10 cm

What is the primary factor affecting beam mode variability in remote sensing radars?

Orbit and look direction Signup and view all the answers

Which radar frequency band is used on the NASA/JPL AIRSAR system?

P-band Signup and view all the answers

What is the effect of opposing look directions on agricultural fields in radar images?

Produce different tones due to row direction related to planting, tilling, or harvesting Signup and view all the answers

Why are opposing look directions often necessary in areas with high relief?

To fill in areas of radar shadow Signup and view all the answers

What is the local incident angle (θloc) in radar imaging?

The angle between the radar line of sight and the line normal to the local slope Signup and view all the answers

What is the largest source of error in radiometric calibration in radar imaging?

Local incident angle Signup and view all the answers

What is the difference between topographic displacement in radar and optical systems?

Topographic displacement differs between the systems due to different imaging geometries Signup and view all the answers