Question

Colour signature on standard false colour composite of the earth surface feature such as turbid waterbody is:

• A. Light blue
• B. Dark blue
• C. Light green
• D. Thick black

Hint:

Turbid water in false colour composite: light blue due to sediment reflectance.

Answer 1

The Correct Option is A

The false colour composite (FCC) is a technique used in remote sensing to visualize features on the Earth's surface by representing various spectral bands in different colours. In a standard false colour composite:

• Near Infrared (NIR) is displayed as red,
• Red is displayed as green,
• Green is displayed as blue.

Turbid water bodies contain suspended particles such as silt, mud, and algae, which increase its reflectance in the red and green bands while reducing it in the near-infrared band. This results in a light blue signature in a standard false colour composite image. This characteristic colour allows users to differentiate turbid water from other surface types, such as vegetation or clear water bodies that appear differently on FCC images. Therefore, the color signature for a turbid water body in a standard FCC is light blue.

Correct Answer: Light blue