CH Remote Sensing & Satellite Imagery 2

Question 1

Converting raw satellite digital number values to surface reflectance is accomplished through:

Accepted Answer

Radiometric calibration followed by atmospheric correction

Answer

Georeferencing and map projection

Answer

Spatial resolution enhancement (pansharpening)

Answer

Band ratioing and index calculation

Question 2

ICESat-2, used for shallow water depth mapping, employs which primary technology?

Accepted Answer

Photon-counting green-wavelength LiDAR (ATLAS instrument)

Answer

Radar altimetry with Ku-band signal

Answer

Multispectral push-broom imaging

Answer

Synthetic Aperture Radar interferometry

Question 3

What is the primary limitation of optical satellite imagery when used for bathymetric surveys?

Accepted Answer

Water turbidity and depth restrict usable optical penetration

Answer

Insufficient spatial resolution for most coastal features

Answer

Inability to be corrected for atmospheric effects

Answer

Revisit interval is too long for tidal cycle capture

Question 4

WorldView-2 is particularly valuable for coastal bathymetric mapping because it provides:

Accepted Answer

Eight multispectral bands including a coastal blue band with sub-meter panchromatic resolution

Answer

SAR capability and 1-meter resolution in all weather

Answer

Daily revisit time with 30-meter multispectral resolution

Answer

Thermal infrared bands for sea surface temperature

Question 5

In multispectral satellite-derived bathymetry, which wavelength range penetrates deepest into clear oceanic water?

Accepted Answer

Blue band (~450 nm)

Answer

Red band (~650 nm)

Answer

Near-infrared band (~850 nm)

Answer

Green band (~550 nm)

Question 6

The primary purpose of atmospheric correction when processing satellite imagery for hydrographic applications is to:

Accepted Answer

Remove the distorting effects of atmospheric scattering and absorption on measured radiance

Answer

Increase the spatial resolution of the sensor data

Answer

Merge overlapping imagery from adjacent satellite swaths

Answer

Convert geographic coordinates to a projected coordinate system

Question 7

With both Sentinel-2A and Sentinel-2B satellites operating, the approximate revisit interval at the equator is:

Accepted Answer

5 days

Answer

1 day

Answer

16 days

Answer

26 days