GEOG 330 Chapter 2 - Chapter 2: Principles of...

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Unformatted text preview: Chapter 2: Principles of Electromagnetic Radiation & Energy Matter Interactions Introduction to Remote Sensing Geography 330 What we will be covering: ! Energy what is it & how is it transmitted? ! Electromagnetic radiation models (1) Wave model ! Wavelength, frequency, Stefan-Boltzmann Law, Wiens Displacement Law, etc. (2) Particle model ! Light is a particular kind of Matter (Feinberg, 1985) ! Atmospheric energy-matter interactions ! Terrain energy-matter interactions Fundamental properties of energy ! Energy recorded by a sensor undergoes a series of fundamental interactions. Understanding these interactions is essential for properly interpreting remotely sensed data. 2 3 1 4 5 6 1. Energy is radiated from the sun. 2. Propagates through the vacuum of space at the speed of light. 3. Interacts with Earths atmosphere 4. Interacts with Earths surface. 5. Is absorbed by the Earth and re- radiated back into space. 6. Reaches the sensor and interacts with electro-optical systems, filters and detectors. Fundamental properties of energy ! How does energy get transferred? In the process, energy is often transferred from one body to another or from one place to another. This occurs in one of three basic ways: ! (1) Conduction ! (2) Convection ! (3) Radiation Fundamental properties of energy ! (1) Conduction occurs when one body transfers its kinetic energy to another through physical contact ! (2) Convection occurs when the kinetic energy of a body (gas or liquid) is transferred from one place to another by physically moving the bodies Fundamental properties of energy ! (3) Electromagnetic radiation (EMR) occurs when electromagnetic energy is transferred in a vacuum at the speed of light and is detected when it interacts with matter. Why might this form of energy transfer matter for RS? EMR models ! To understand how EMR is created, how it propagates through space, and how it interacts with other matter, it is useful to describe the process using two different models: (1) The wave model (2) The particle model Wave model of electromagnetic energy ! An electromagnetic wave is composed of both electric and magnetic vectors that are orthogonal (at 90 angels) to another another. The waves travel from the source at the speed of light (3 x 10 8 m s-1 ) Source: Jensen (2007:39) Maxwell conceptualized EMR as an electromagnetic wave: But how is an electromagnetic wave created? Wave model of electromagnetic energy ! When discussing EMR, we typically think in terms of wavelength and frequency, where: Wavelength ( ! ) ! = the mean distance between consecutive maximums (or minimums) of a roughly periodic pattern ! Usually measured in micrometers ( ! m) or nanometers (nm)....
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GEOG 330 Chapter 2 - Chapter 2: Principles of...

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