Rice monitoring using Sentinel-1 SAR data

The backscattered signal results from:

• Surface scattering

   

• Volume scattering

• Multiple volume-surface scattering

• All of the above

The radar measurements depends on:

• Polarisation, Incidence angle,

• Polarisation, radar frequency bands

• Polarisation, Incidence angle, radar frequency bands

• Polarisation, Incidence angle, radar frequency bands, speckle noise

Find the wrong information

• Low backscatter radar response on flat surface

• Large radar response on surface with local slope

• Scattering mechanisms doesn't depend on surface roughness

• Scattering mechanisms depend on dielectric properties of the medium

Find the wrong answer for "Sentinel-1 SAR has:.."

• Two satellites (S1-A and S1-B) with C-band SAR

• Dual polarizations: HH & VV

• All-weather sensor: Not sensitive to clouds

• In operation since 2014

The wavelength of C-band:

• 1.7-2.4 (cm)

• 2.4-3.8 (cm)

• 3.8-7.5 (cm)

• 7.5-15 (cm)

After sowing or transplanting, the rice plants go through ... phases:

• 3

• 4

• 5

• 6

The specific radar physical interaction mechanisms for rice fields: vegetation layer, wet soil (or water).

• True

• False

C band radar can penetrate in the 0-100 cm vegetation layer.

• True

• False

Which characteristics can affect the radar backscatter of rice fields?

• Rice field conditions (wet bare soil, mud or water pockets..)

• The rice plant structure change

• Cultural practices

• All of the above

S1 time series used to distinguish rice from other LULC based on:

• Minimum backscatter of VH & VV

• Maximum backscatter of VH & VV

• Maximum backscatter Increase of VH

• All of the above