Principles of Remote Sensing Quiz

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Which element of remote sensing involves the transmission and reception of energy?

Recording of the reflected energy by the sensor

Propagation through the atmosphere

Energy or illumination source

Transmission and reception (correct)

What is the common source of radiation for the electromagnetic spectrum?

Microwave and broadcast radio waves

Ultraviolet rays

The Earth

The Sun (correct)

Which form of electromagnetic energy is specifically mentioned as being transmitted from the Sun to the Earth?

Radio waves

Visible light (correct)

X-rays

Heat

What is the range of the electromagnetic spectrum in terms of wavelengths?

Shorter wavelength at gamma rays to longer wavelengths at microwave and broadcast radio waves Signup and view all the answers

What is the definition of remote sensing?

Collection of information about an object without coming into physical contact with it Signup and view all the answers

What is the range of wavelengths for the visible region of the electromagnetic spectrum?

0.4 μm to 0.7 μm Signup and view all the answers

What is the function of specular reflectance?

Leaving at a reflected angle equal to angle of incidence Signup and view all the answers

What is the significance of the spectral signature of materials?

It provides insight into the spectral characteristics of objects/features Signup and view all the answers

Which region has a wavelength ranging from 0.7 μm to 1.0 mm?

Infrared region Signup and view all the answers

What does the reflectance of vegetation indicate about its absorption?

High absorption in red and blue wavelengths Signup and view all the answers

In the context of GIS and remote sensing, what is the primary purpose of image rectification?

To correct for geometric distortions in the image Signup and view all the answers

What is the main objective of radiometric corrections in digital image processing for remote sensing?

To ensure consistency and accuracy in the pixel values of the images Signup and view all the answers

What is the primary role of spectral indices in remote sensing applications?

To quantify specific features or properties of the land or vegetation Signup and view all the answers

What is the key purpose of noise removal in digital image processing for remote sensing?

To ensure clarity and accuracy in the images by reducing unwanted disturbances Signup and view all the answers

In the context of remote sensing, what is the main purpose of spatial enhancements in image processing?

To enhance the visual interpretation and analysis of images Signup and view all the answers

What is the primary purpose of radiometric correction in remote sensing?

To reduce or correct errors in the digital numbers of images Signup and view all the answers

What does radiance measured by a sensor depend on?

Distance between the Earth and the sun and the altitude of the sun above the horizon Signup and view all the answers

What additional information is required to convert raw sensor values (DN) to radiance?

Earth-sun distance, Solar zenith angle, exoatmospheric irradiance Signup and view all the answers

What is included in Landsat Level-2 Science Products?

Surface reflectance, surface temperature, surface reflectance-derived spectral indices, and provisional aquatic reflectance Signup and view all the answers

What is the primary purpose of noise removal in remote sensing images?

To remove unwanted noise including destriping and random noise Signup and view all the answers