SE $212-$ Exercise $(14)$

Question One

$($i$)$ Define in details the concept of $($Remote Sensing$)$

$($ii$)$ Compare : Active RS systems & passive RS systems

$($iii$)$ Explain the Electromagnetic Radiation Reaction with Earth Surface

$($iv$)$ Define and give example for Spectral Signature curve.

Question Two

The figure below shows the reflectance curve of water of different turbidity $($from $25$ to $200$mg$/$l$).$

At what wavelength does turbidity has no effect on reflectance?.

At what wave length does water with high turbidity has maximum reflectance?.

what is the $\%$ reflectance of water of turbidity of $50m\frac{g}{l}$ at this wavelength?

Question Three

The figure below is a $55$ pixel of a digital image with digital numbers recorded within pixels. Delineate the boundaries of : Water $(\%$ reflectance $15\%),$ grassland $(\%$ reflectance $40\%),$ forest $(\%$ reflectance $60\%),$ and sand $(\%$ reflectance $80\%)$

Label the classes as: $W$ for water, $G$ for grass, $F$ for forest, $S$ for sand.

$\backslash$table$[[103,105,102,230,220],[101,100,220,225,222],[104,102,221,221,220],[62,105,103,227,22],[61,58,54,20,21]]$